table 3(a) : population fluctuation (size distribution) of...

Table 3(A) : Population fluctuation (size distribution) of snails at Asan Barrage (L-1) locality of Doon Valley during March 2002 to February 2003

Lymnaea (P.) acuminata f. chlamys (Benson, 1836) Lymnaea (P.) acuminata f. patula (Troschel, 1837) Species→

Months↓ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total

Mar. 10 13 3 – – 26 3 12 1 – – 16

Apr. 12 15 2 – – 29 6 15 2 – – 23

May 10 18 3 – – 31 8 14 3 – – 25

Jun. 12 20 4 – – 36 7 11 4 – – 22

Jul. 10 12 1 – – 23 4 8 1 – – 13

Aug. 8 5 – – – 13 4 3 – – – 7

Sep. 5 7 – – – 12 3 6 – – – 9

Oct. 8 14 – – – 22 6 10 – – – 16

Nov. 7 10 2 – – 19 5 7 1 – – 13

Dec. 4 11 1 – – 16 4 6 2 – – 12

Jan. 6 10 – – – 16 3 8 – – – 11

Feb. 8 12 2 – – 22 5 9 – – – 14

Total 100 147 18 – – 265 58 109 14 – – 181

%age 37.74 55.46 6.80 – – 32.05 60.22 7.73

Contd . . .

Table 3 (A) contd . . .

Thiara (M.) tuberculata (Mueller, 1774) Indoplanorbis exustus (Deshayes, 1834) Species→ Months↓ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total

Mar. 3 9 10 5 1 28 4 4 – – – 8

Apr. 2 10 15 3 2 32 2 5 2 – – 9

May 4 7 10 4 3 28 4 4 2 – – 10

Jun. 3 9 8 8 2 30 3 7 1 – – 11

Jul. – 8 8 5 3 24 – 7 – – – 7

Aug. – 7 5 2 – 14 – 5 – – – 5

Sep. 4 8 5 3 – 20 2 3 2 – – 7

Oct. 6 12 14 6 – 38 3 4 – – – 7

Nov. 4 5 12 2 – 23 5 6 1 – – 12

Dec. – 5 5 3 – 13 3 9 3 – – 15

Jan. 3 7 8 5 – 23 2 4 – – – 6

Feb. 2 9 10 6 – 27 1 7 – – – 8

Total 31 96 110 52 11 300 29 65 11 – – 105

%age 10.03 32.0 36.67 17.34 3.66 27.62 61.90 10.48 – –

Table 3(B) : Population fluctuation (size distribution) of snails at Asan Barrage (L-1) locality of Doon Valley during March 2003 to February 2004

Lymnaea (P.) acuminata f. chlamys (Benson, 1836) Lymnaea (P.) acuminata f. patula (Troschel, 1837) Species→

Months↓s < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total

Mar. 10 15 2 – – 27 4 11 1 – – 16

Apr. 10 16 1 – – 27 7 10 2 – – 19

May 15 20 3 – – 38 8 13 2 – – 23

Jun. 12 20 4 – – 36 5 12 3 – – 20

Jul. 12 8 2 – – 22 5 8 – – – 13

Aug. 10 7 1 – – 18 6 7 – – – 13

Sep. 5 14 – – – 19 6 11 – – – 17

Oct. 7 15 – – – 22 7 12 1 – – 20

Nov. 6 16 1 – – 23 10 13 2 – – 25

Dec. 5 15 1 – – 21 6 9 1 – – 16

Jan. 7 11 – – – 18 4 6 – – – 10

Feb. 6 13 2 – – 21 5 10 1 – – 16

Total 105 170 17 – – 292 73 122 13 – – 208

%age 39.39 54.78 5.83 – – 35.10 58.65 6.25 – –

Contd . . .

Table 3 (B) contd . . .

Thiara (M.) tuberculata (Mueller, 1774) Indoplanorbis exustus (Deshayes, 1834) Species→ Months↓ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total

Mar. 4 8 12 5 – 29 3 8 – – – 11

Apr. 5 11 10 6 2 34 3 6 – – – 9

May 4 12 8 5 3 32 2 5 1 – – 8

Jun. 6 12 9 4 1 32 3 7 1 – – 11

Jul. 4 5 7 2 3 21 3 4 2 – – 9

Aug. 6 7 5 2 – 20 – 4 – – – 4

Sep. 7 12 4 6 – 29 2 2 1 – – 5

Oct. 6 10 12 5 2 35 3 4 – – – 7

Nov. 7 12 7 2 – 28 5 6 – – – 11

Dec. 4 6 5 3 – 18 4 8 2 – – 14

Jan. 5 6 5 3 – 19 3 4 – – – 7

Feb. 3 5 8 5 2 23 3 5 – – – 8

Total 61 106 92 48 13 320 34 63 7 – – 104

%age 19.05 33.12 28.78 15.78 4.05 33.01 60.38 6.61 – –

Table 4(A) : Population fluctuation (size distribution) of snails at Sahaspur (L-2) locality of Doon Valley during March 2002 to February 2003

Bellamya bengalensis f. typica (Lamarck, 1882) Bellamya dissimilis (Mueller, 1774) Species→


Mar. – 6 7 8 4 25 – 3 3 4 2 12

Apr. – 5 7 6 4 22 1 4 4 2 2 13

May 1 4 5 8 5 23 – 2 4 4 3 13

Jun. 1 4 5 6 3 19 – 3 4 2 – 9

Jul. – 5 3 3 2 13 2 3 2 1 – 8

Aug. – – – – – – – – – – – –

Sep. – – 2 5 – 7 – 2 2 3 – 7

Oct. 2 – 2 2 1 7 1 2 3 – – 6

Nov. 2 2 3 2 1 10 2 3 3 2 1 11

Dec. 1 2 1 1 2 7 1 2 1 2 1 7

Jan. – 4 2 4 – 10 – 5 5 4 3 17

Feb. – 3 6 3 2 14 – 2 4 4 3 13

Total 7 35 43 48 24 157 7 31 35 28 15 116

%age 4.45 22.3 27.37 30.56 15.27 6.04 26.72 30.18 24.13 12.93

Contd . . .

Table 4(A) contd . . .

Thiara (M.) tuberculata (Mueller, 1774) Lymnaea sp. Species→ Months↓ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total

Mar. 4 10 11 4 2 31 5 8 2 – – 15

Apr. 3 15 15 3 3 39 6 10 2 – – 18

May 5 10 17 6 3 41 5 13 3 – – 21

Jun. 8 11 15 6 – 40 4 15 2 – – 21

Jul. – 8 10 4 1 23 8 3 – – – 11

Aug. – 7 8 5 – 20 6 7 – – – 13

Sep. 5 10 9 4 – 28 8 11 – – – 19

Oct. 8 9 11 5 – 33 5 13 – – – 18

Nov. 4 12 17 10 4 47 5 10 1 – – 16

Dec. 3 8 12 8 2 33 – 14 2 – – 16

Jan. 3 11 11 3 – 28 2 12 3 – – 17

Feb. 2 12 14 3 1 32 – 18 2 – – 20

Total 45 123 150 61 16 395 54 134 17 – – 205

%age 11.39 31.13 37.98 15.44 4.05 26.34 65.36 8.30 – –

Table 4(B) : Population fluctuation (size distribution) of snails at Sahaspur (L-2) locality of Doon Valley during March 2003 to February 2004

Bellamya bengalensis f. typica (Lamarck, 1882) Bellamya dissimilis (Mueller, 1774) Species→


Mar. 1 7 6 9 5 28 1 4 4 3 2 14

Apr. – 4 8 7 6 25 1 6 3 4 3 17

May 2 2 7 8 4 23 3 4 3 2 1 13

Jun. 1 4 6 6 5 22 1 2 2 3 1 9

Jul. 1 4 4 8 2 19 – 1 3 2 1 7

Aug. – 2 3 2 – 7 – – 3 2 – 5

Sep. – 3 2 3 – 8 2 3 3 – – 8

Oct. – 4 4 5 – 13 2 2 2 1 – 7

Nov. 2 5 3 4 2 16 – 4 4 2 1 11

Dec. 2 4 6 3 – 15 – 3 5 4 1 13

Jan. 1 3 4 4 1 13 – 6 6 5 2 19

Feb. – 2 5 2 2 11 2 5 7 5 4 23

Total 10 44 58 61 27 200 12 40 45 33 16 146

%age 5 22 29 30.5 13.5 8.27 27.58 31.04 22.76 10.35

Contd . . .

Table 4 (B) contd . . .

Thiara (M.) tuberculata (Mueller, 1774) Lymnaea sp. Species→ Months↓ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total

Mar. 4 12 11 5 3 35 4 10 2 – – 16

Apr. 4 15 16 10 5 50 5 10 3 – – 18

May 6 12 17 7 4 46 5 12 3 – – 20

Jun. 4 15 16 4 3 42 4 12 2 – – 18

Jul. 3 10 13 10 3 39 10 – – – – 10

Aug. – 7 7 8 – 22 7 5 – – – 12

Sep. 6 10 8 4 – 28 8 10 – – – 18

Oct. 10 9 12 6 – 37 5 15 – – – 20

Nov. 7 10 7 5 – 29 3 12 1 – – 16

Dec. – 12 15 3 1 31 – 12 2 – – 14

Jan. 4 10 10 4 – 28 2 14 3 – – 19

Feb. 3 11 15 4 2 35 – 17 3 – – 20

Total 51 133 147 70 21 422 53 129 19 – – 201

%age 12.09 31.52 34.84 16.56 4.98 26.37 64.18 9.45 – –

Table 5 (A) : Population fluctuation (size distribution) of snails at Dudhli (L-3) locality of Doon Valley during March 2002 to February 2003

Thiara (M.) tuberculata (Mueller, 1774) Thiara sp. Species→


Mar. 3 5 8 7 2 25 4 6 5 3 1 19

Apr. 2 8 11 9 2 32 – 9 7 5 2 23

May – 12 15 10 3 40 2 10 9 4 1 26

Jun. 2 15 17 7 3 44 – 12 10 2 3 27

Jul. – 11 8 11 4 34 3 8 6 3 – 20

Aug. – 12 9 7 – 28 4 5 5 2 – 16

Sep. 4 6 7 5 – 22 3 5 3 2 – 13

Oct. 7 10 8 4 1 30 3 6 5 3 1 18

Nov. 3 7 7 5 2 24 2 5 3 1 1 12

Dec. – 10 5 3 – 18 – 6 2 1 – 9

Jan. 3 7 6 4 – 20 – 4 3 3 – 10

Feb. 6 5 7 8 1 27 2 6 4 4 – 16

Total 30 108 108 80 18 344 23 82 62 33 9 209

%age 8.72 31.40 31.40 23.25 5.23 11.00 39.24 29.66 15.79 4.31

Contd . . .

Table 5(A) contd . . .

Lymnaea (P) acuminata f. patula (Troschel, 1837) Species→ Months↓ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total

Mar. 5 5 2 – – 12

Apr. 7 8 2 – – 17

May 4 6 1 – – 11

Jun. 2 5 2 – – 9

Jul. – 3 – – – 3

Aug. – – – – – –

Sep. 4 1 – – – 5

Oct. – 3 2 – – 5

Nov. 3 3 1 – – 7

Dec. 1 2 – – – 3

Jan. 3 4 – – – 7

Feb. 4 5 1 – – 10

Total 33 45 11 – – 89

%age 37.07 50.57 12.36 – –

Table 5 (B) : Population fluctuation (size distribution) of snails at Dudhli (L-3) locality of Doon Valley during March 2003 to February 2004



Mar. 5 8 10 7 2 32 3 5 5 3 2 18

Apr. 4 11 10 9 2 36 – 10 6 6 3 25

May 5 11 12 10 3 41 2 6 7 5 2 22

Jun. 4 15 14 8 4 45 – 9 5 4 1 19

Jul. 6 10 12 11 1 40 2 5 6 4 – 17

Aug. – 14 11 7 – 32 4 5 3 2 – 14

Sep. 3 6 9 5 1 24 6 7 3 3 – 19

Oct. 9 8 11 3 – 31 5 8 4 2 2 21

Nov. 5 8 10 4 – 27 4 7 3 2 – 16

Dec. – 8 9 4 – 21 – 8 4 3 – 15

Jan. 4 5 6 3 – 18 – 3 2 2 – 7

Feb. 6 4 7 5 1 23 3 4 3 2 – 12

Total 51 108 121 76 14 370 29 77 51 38 10 205

%age 13.78 29.18 32.72 20.54 3.78 14.14 37.56 24.88 18.54 4.88

Contd . . .

Table 5 (B) contd. . . .

Lymnaea (P) acuminata f. patula (Troschel, 1837) Species→ Months↓ < 5mm 6-10 mm 11-15mm 16-20mm 21-25mm Total

Mar. 4 7 1 – – 12

Apr. 3 8 2 – – 13

May 2 12 – – – 14

Jun. 3 8 1 – – 12

Jul. 4 2 – – – 6

Aug. 3 – – – – 3

Sep. 3 2 – – – 5

Oct. – 5 2 – – 7

Nov. 3 4 1 – – 8

Dec. 3 2 – – – 5

Jan. 3 3 1 – – 7

Feb. 4 4 1 – – 9

Total 34 58 9 – – 101

%age 33.66 57.43 8.91

Table 6 (A) : Population fluctuation (size distribution) of snails at Lacchiwala (L-4) locality of Doon Valley during March 2002 to February 2003

Thiara (M.) tuberculata (Muller, 1774) Thiara sp. Species→


Mar. 3 10 12 6 – 31 5 5 10 2 2 24

Apr. – 15 18 7 4 44 3 8 12 3 – 26

May 4 16 15 9 4 48 4 12 11 5 1 33

Jun. 5 18 20 12 5 60 2 15 9 7 2 35

Jul. 7 13 13 9 4 46 – 14 11 4 1 30

Aug. – 10 8 3 1 22 – 10 7 3 – 20

Sep. – 8 10 5 3 26 – 11 8 3 – 22

Oct. 3 10 11 5 – 29 2 8 5 2 – 17

Nov. 5 15 12 4 1 37 3 7 7 – – 17

Dec. – 5 10 2 1 18 – 5 6 – – 11

Jan. 4 8 11 3 – 26 3 7 4 5 1 20

Feb. 6 10 10 4 2 32 5 6 9 3 – 23

Total 37 138 150 69 25 419 27 108 99 37 7 278

%age 8.84 32.94 35.79 16.47 5.96 9.71 38.85 35.61 13.31 2.52

Table 6 (B) : Population fluctuation (size distribution) of snails at Lacchiwala (L-4) locality of Doon Valley during March 2003 to February 2004



Mar. 5 15 17 6 – 43 6 8 12 2 – 28

Apr. 8 19 15 6 – 48 4 11 12 5 – 32

May 9 15 20 9 3 56 7 15 10 7 – 39

Jun. 8 12 18 10 5 53 4 12 15 4 2 37

Jul. 7 12 17 12 5 53 4 12 8 3 3 30

Aug. – 8 12 8 4 32 – 8 5 7 1 21

Sep. – 12 15 5 2 34 – 12 8 4 – 24

Oct. 5 18 13 4 – 40 2 15 12 – – 29

Nov. 2 10 15 3 – 30 – 10 8 3 – 21

Dec. – 8 13 4 2 27 – 8 10 – – 18

Jan. 2 5 10 3 – 20 – 5 3 2 – 10

Feb. 2 7 8 4 1 22 2 4 7 2 1 16

Total 48 141 173 74 22 458 29 120 110 39 7 305

%age 13.0 30.78 37.77 16.15 4.86 9.50 39.34 36.06 12.80 2.30

Table 7 (A) : Population fluctuation (size distribution) of snails at Gularghati (L-5) locality of Doon Valley during March 2002 to February 2003



Mar. 3 8 12 6 3 32 2 4 6 2 – 14

Apr. – 10 16 9 4 39 – 7 4 3 1 15

May 3 15 18 7 3 46 3 9 5 3 2 22

Jun. 2 18 16 10 4 50 – 6 6 4 2 18

Jul. 3 12 15 6 2 38 2 4 3 2 – 11

Aug. 5 7 9 3 – 24 3 5 3 1 – 12

Sep. 7 8 10 6 – 31 5 4 6 1 – 16

Oct. 4 10 13 7 2 36 3 7 4 3 – 17

Nov. 2 7 10 4 – 23 2 4 3 3 1 13

Dec. – 8 10 3 1 22 – 5 4 2 – 11

Jan. – 8 10 3 – 21 – 3 5 2 – 10

Feb. 3 10 11 5 1 30 1 4 6 1 1 13

Total 32 121 150 69 20 392 21 62 55 27 7 172

%age 8.16 30.87 38.26 17.60 5.11 12.21 36.05 31.97 15.70 4.07

Table 7 (B) : Population fluctuation (size distribution) of snails at Gularghati (L-5) locality of Doon Valley during March 2003 to February 2004



Mar. 4 9 12 8 2 35 2 5 4 3 – 14

Apr. – 13 16 10 3 42 – 8 5 2 2 17

May 4 15 18 8 4 49 3 8 6 4 3 24

Jun. 4 17 15 12 5 53 – 7 5 5 3 20

Jul. 3 10 11 8 2 34 4 4 5 3 – 16

Aug. 5 11 8 5 – 29 3 5 2 2 – 12

Sep. 6 7 10 4 – 27 4 3 4 1 – 12

Oct. 7 9 11 5 1 33 4 6 3 5 – 18

Nov. 5 10 15 5 – 35 3 6 2 4 1 16

Dec. – 8 12 4 1 25 1 5 3 2 – 11

Jan. 2 5 8 3 – 18 – 3 3 4 – 10

Feb. 4 8 10 5 2 29 1 4 4 3 – 12

Total 44 122 146 77 20 409 25 64 46 38 9 182

%age 10.76 29.82 35.70 18.83 4.89 13.73 35.16 25.28 20.88 4.95

Table 3(a) : Population fluctuation (size distribution) of snails from Asan Barrage locality of Doon Valley during March 2002 to February 2003

S.No. Name of Locality Lym. (P)

acuminata f. chlamys

Lym. (P) acuminata f. patula

Lymnaea sp.

Bellamya bengalensis

Bellamya dissimilis

Thiara (M) tubrculata

Thiara sp.

Indoplanorbis exustus

Total

2002 – 2003

1. Asan Barrage 292 208 – – – 320 – 106

2. Sahaspur – – 205 157 113 339 – –

3. Dudhli – 89 – – – 332 218 –

4. Lacchiwala – – – – – 419 278 –

5. Gularghati – – – – – 392 172 –

Total 292 297 205 157 113 1802 668 106 3640

2003 – 2004

1. Asan Barrage 265 181 – – – 300 – 105

2. Sahaspur – – 201 200 145 442 – –

3. Dudhli – 101 – – – 370 205 –

4. Lacchiwala – – – – – 458 305 –

5. Gularghati – – – – – 400 182 –

Total 265 282 201 200 145 1950 792 105 3940

Table 8 (A) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Asan Barrage (L-1) Locality of Doon Valley during March 2002 to February 2003

Number of Snails Types of Cercariae Recovered Months Collected Examined Infected

Infection Rate (%) Xiphidio cercaria Furcocercous

Mar. 28 22 1 4.54 + –

Apr. 32 28 – – – –

May 28 25 – – – –

Jun. 30 20 – – – –

Jul. 24 18 – – – –

Aug. 14 14 1 7.14 + –

Sep. 20 15 1 6.66 + –

Oct. 38 20 2 10.00 + –

Nov. 23 13 2 15.38 + –

Dec. 13 10 1 10.00 – +

Jan. 23 15 1 6.66 – +

Feb. 27 20 1 5.0 + –

300 220 10

Table 8 (B) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Asan Barrage (L-1) Locality of Doon Valley during March 2003 to February 2004



Mar. 29 25 1 4.00 + –

Apr. 34 25 – – – –

May 32 30 – – – –

Jun. 32 28 – – – –

Jul. 21 25 – – – –

Aug. 20 15 1 6.66 + –

Sep. 29 17 1 5.88 + –

Oct. 35 23 2 8.70 + –

Nov. 28 18 2 11.11 + –

Dec. 18 15 2 13.33 + –

Jan. 19 16 1 6.25 + –

Feb. 23 20 1 5.0 + –

320 267 11

Table 9 (A) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Sahaspur (L-2) Locality of Doon Valley during March 2002 to February 2003



Mar. 31 26 2 7.61 – +

Apr. 39 25 1 3.33 + –

May 41 30 – – – –

Jun. 40 35 – – – –

Jul. 23 20 – – – –

Aug. 20 16 1 6.25 + –

Sep. 28 20 2 10.00 + –

Oct. 33 25 3 12.00 + –

Nov. 47 30 5 16.66 + +

Dec. 23 18 3 16.66 – +

Jan. 28 20 2 10.00 – +

Feb. 32 25 2 8.00 + –

395 290 21

Table 9 (B) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Sahaspur (L-2) Locality of Doon Valley during March 2003 to February 2004



Mar. 35 30 2 6.66 – +

Apr. 50 30 1 3.33 + –

May 46 35 – – – –

Jun. 42 35 – – – –

Jul. 39 30 – – – –

Aug. 22 17 1 5.88 + –

Sep. 28 25 2 8.00 + –

Oct. 37 30 3 10.00 + +

Nov. 29 25 4 16.00 + +

Dec. 31 20 3 15.00 + –

Jan. 28 20 3 15.00 + –

Feb. 35 25 2 8.00 – +

422 322 21

Table 10 (A) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Dudhli Locality (L-3) of Doon Valley during March 2002 to February 2003



Mar. 25 20 2 10.00 – +

Apr. 32 25 2 8.00 + –

May 40 30 1 3.33 + –

Jun. 44 30 1 3.33 + –

Jul. 34 25 2 8.00 + –

Aug. 28 20 2 10.00 – +

Sep. 22 15 3 20.00 – +

Oct. 30 20 5 25.00 + +

Nov. 24 20 6 30.00 + +

Dec. 18 15 4 26.00 + –

Jan. 20 15 3 20.00 + –

Feb. 27 20 3 15.00 – +

344 255 34

Table 10 (B) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Dudhli (L-3) Locality of Doon Valley during March 2003 to February 2004



Mar. 32 25 3 12.00 + –

Apr. 36 25 2 8.00 + –

May 41 30 – – – –

Jun. 45 30 – – – –

Jul. 40 30 2 6.66 – +

Aug. 32 25 3 12.00 – +

Sep. 24 20 3 15.00 + –

Oct. 31 25 5 20.00 + +

Nov. 27 20 6 30.00 + +

Dec. 21 15 4 26.66 + –

Jan. 18 15 3 20.00 + –

Feb. 23 18 3 16.66 – +

370 278 34

Table 11 (A) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Lacchiwala (L-4) Locality of Doon Valley during March 2002 to February 2003



Mar. 31 20 2 10 + –

Apr. 44 25 2 8 + –

May 48 30 – – – –

Jun. 60 25 – – – –

Jul. 46 30 1 3.33 + –

Aug. 22 20 1 5.00 + –

Sep. 26 20 3 15.00 + –

Oct. 29 25 5 20.00 + +

Nov. 37 28 7 25.00 + +

Dec. 18 15 3 20.00 – +

Jan. 26 20 3 15.00 + –

Feb. 32 25 3 12.00 + –

419 28.3 30

Table 11 (B) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Lacchiwala (L-4) Locality of Doon Valley during March 2003 to February 2004



Mar. 43 30 3 13.33 + +

Apr. 48 35 2 5.73 + –

May 56 30 – – – –

Jun. 53 25 – – – –

Jul. 53 25 1 4.00 + –

Aug. 32 20 3 15.00 + –

Sep. 34 25 5 20.00 + +

Oct. 40 30 7 23.00 + +

Nov. 30 25 7 28.00 + +

Dec. 27 18 4 22.22 – +

Jan. 20 15 3 20.00 – +

Feb. 22 15 2 13.33 + –

458 293 37

Table 12 (A) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Gularghati (L-5) Locality of Doon Valley during March 2002 to February 2003



Mar. 32 25 3 12 + +

Apr. 39 30 3 10 + –

May 46 35 – – – –

Jun. 50 30 – – – –

Jul. 38 30 2 6.66 + –

Aug. 24 20 3 15.00 + –

Sep. 31 25 5 20.00 + +

Oct. 36 25 6 24.00 + +

Nov. 23 20 5 25.00 + +

Dec. 22 18 3 16.00 – +

Jan. 21 15 2 13.33 + –

Feb. 30 20 2 10.00 + –

392 293 34

Table 12 (B) : Seasonal variation of cercarial infection in Thiara (M.) tuberculata (Mueller, 1774) at Gularghati (L-5) Locality of Doon Valley during March 2003 to February 2004



Mar. 35 22 2 9.09 – +

Apr. 42 25 1 4.00 + –

May 49 25 – – – –

Jun. 53 32 – – – –

Jul. 34 20 1 5.00 + –

Aug. 29 20 2 10.00 + –

Sep. 27 20 3 15.00 + –

Oct. 33 25 4 16.00 + +

Nov. 35 25 6 24.00 + +

Dec. 25 20 3 15.00 + –

Jan. 18 15 2 13.33 + –

Feb. 29 20 2 10.00 – +

409 269 26

Table13 (A) : Combined Mosquito Larval Density at Asan Barrage locality (L-1) of Doon Valley during March 2002 to February 2003

Positive breeding Breeding sites

Larval Pupae Breeding Habitats No. of mosquito species

recovered Month

Fixed Random

No. of dips

Fixed Random Fixed Random TA PO DR PI CA IC RI RF Anopheline Aedes Culex

Mar 5 2 35 3 1 2 – 2.85 – 1.42 2.85 – 1.42 – – 1 – –

Apr 5 6 55 3 4 3 2 3.63 – 2.36 4.54 – 2.26 – – 1 1 –

May 5 7 60 2 5 2 4 5.00 – 2.91 3.33 – 2.33 – – 1 1 1

Jun 5 11 80 3 9 3 9 6.25 – 3.12 6.87 – 3.12 1.56 3.43 2 1 1

Jul 5 11 80 4 11 4 10 6.25 – 1.89 9.37 – 6.25 3.12 4.37 2 1 1

Aug 5 15 100 3 13 3 11 – – 2.00 7.50 – 5.00 – 5.00 2 1 1

Sep 5 10 75 3 9 3 9 6.00 – 3.00 6.00 – 4.66 2.0 4.00 2 1 1

Oct 5 7 60 3 6 3 5 3.33 – 1.66 5.41 – 3.75 2.08 – 1 1 1

Nov 5 5 50 2 4 2 2 3.00 – 1.50 4.00 – 3.00 – – 1 1 1

Dec 5 4 – – – – – – – – – – – – – – – –

Jan 5 4 – – – – – – – – – – – – – – – –

Feb 5 3 – – – – – – – – – – – – – – – –

Table 13 (B) : Combined Mosquito Larval Density at Asan Barrage locality (L-1) of Doon Valley during March 2003 to February 2004



recovered Month

Fixed Random

No. of dips


Mar 5 3 40 3 1 1 1 2.25 – 1.25 1.87 – 1.50 – – 1 1 –

Apr 5 6 55 3 3 3 2 3.54 – 1.81 4.09 – 1.81 – – 1 1 –

May 5 8 65 2 5 2 3 5.38 – 3.07 3.84 – 3.00 1.15 – 1 1 1

Jun 5 10 75 3 8 3 6 5.33 – 4.00 6.00 – 4.00 2.00 2.66 2 1 1

Jul 5 11 80 4 9 3 9 6.25 – 3.12 6.25 – 3.12 3.75 5.00 2 – –

Aug 5 13 90 4 9 3 9 – – 2.77 6.66 – 3.44 – 6.11 2 1 1

Sep 5 10 75 2 12 3 9 5.33 – 2.66 6.66 – 2.33 2.66 4.00 2 1 1

Oct 5 6 55 3 8 3 6 3.63 – 2.45 6.37 – 2.72 2.90 – 1 1 1

Nov 5 4 45 3 4 2 3 2.77 – 2.22 4.44 – 1.88 – – 1 – –

Dec 5 4 – – – – – – – – – – – – – – – –

Jan 5 3 – – – – – – – – – – – – – – – –

Feb 5 1 – – – – – – – – – – – – – – – –

Table 14 (A) : Combined Mosquito Larval Density at Sahaspur locality (L-2) of Doon Valley during March 2002 to February 2003



recovered Month

Fixed Random

No. of dips


Mar 5 5 50 3 2 2 1 3.00 – 1.00 3.20 – 1.20 – – 1 1 –

Apr 5 5 50 3 4 3 2 5.00 – 2.00 4.60 – 3.00 – – 1 – –

May 5 7 65 2 7 2 5 5.45 4.07 2.53 5.33 – 3.61 – – 1 – 1

Jun 5 10 75 3 8 3 7 4.60 4.66 2.66 4.66 1.00 3.33 2.00 – 2 1 1

Jul 5 11 80 4 8 4 8 7.21 4.37 2.93 6.25 1.85 2.31 3.12 2.25 2 1 1

Aug 5 18 115 4 14 4 13 – 4.78 1.73 6.52 – 3.04 – 4.34 3 1 1

Sep 5 13 90 3 10 2 8 5.00 5.55 1.66 6.66 1.11 1.94 2.50 6.66 3 1 1

Oct 5 10 25 3 7 3 7 4.62 – 1.66 6.00 – 2.80 – 5.33 2 1 1

Nov 5 6 55 2 4 1 3 3.81 – 1.36 4.54 – 2.72 – – 1 1 1

Dec 5 5 – – – – – – – – – – – – – – – –

Jan 5 4 – – – – – – – – – – – – – – – –

Feb 5 5 – – – – – – – – – – – – – – – –

Table 14 (B) : Combined Mosquito Larval Density at Sahaspur locality (L-2) of Doon Valley during March 2003 to February 2004



recovered Month

Fixed Random

No. of dips


Mar 5 4 45 3 1 2 1 3.88 – 0.77 2.77 – 1.11 – – 1 1 1

Apr 5 5 50 2 3 1 2 4.00 1.50 1.50 – – 1.20 – – 1 1 1

May 5 7 60 3 4 2 3 5.00 2.08 2.50 2.50 – 2.08 – – 2 – 1

Jun 5 7 60 4 7 3 4 7.08 3.33 3.33 5.00 1.25 2.66 1.25 – 2 – 1

Jul 5 11 80 3 10 3 8 5.00 2.50 1.56 5.62 1.37 1.87 1.25 3.12 3 1 1

Aug 5 15 100 4 12 3 10 5.00 2.50 1.50 6.00 – 2.25 1.35 4.00 4 1 1

Sep 5 15 100 4 8 3 5 6.00 2.10 1.50 5.00 0.75 1.50 – 4.50 4 1 1

Oct 5 10 75 3 5 3 3 6.00 2.33 1.46 4.66 – 1.26 – 5.00 3 1 1

Nov 5 5 50 2 5 2 3 4.00 – 1.50 – – 2.00 – – 2 1 1

Dec 5 4 – – – – – – – – – – – – – – – –

Jan 5 4 – – – – – – – – – – – – – – – –

Feb 5 5 – – – – – – – – – – – – – – – –

Table 15 (A) : Combined Mosquito Larval Density at Dudhli locality (L-3) of Doon Valley during March 2002 to February 2003



recovered Month

Fixed Random

No. of dips


Mar 5 4 45 3 2 2 1 5.00 – 2.22 4.44 – 2.22 – – 1 – 1

Apr 5 8 65 3 6 3 4 4.51 – 3.07 3.84 0.76 2.70 – – 1 – 1

May 5 9 70 2 8 2 6 5.71 – 3.21 4.64 0.85 2.85 – – 1 1 –

Jun 5 13 90 3 11 3 10 5.55 – 3.05 5.55 0.66 3.88 1.36 4.44 2 1 1

Jul 5 17 110 4 15 4 12 5.70 – 2.13 5.45 0.45 4.54 1.66 4.54 3 1 1

Aug 5 19 120 4 18 3 17 – – 2.08 6.25 0.62 4.60 2.10 5.00 4 1 1

Sep 5 14 95 3 12 3 10 6.31 – 1.70 5.80 0.42 5.26 2.00 3.15 4 – 1

Oct 5 10 75 2 8 2 7 5.33 – 1.60 5.0 – 4.00 2.30 – 3 1 1

Nov 5 8 65 2 6 2 5 3.84 – 1.53 3.84 – 3.8 – – 2 1 1

Dec 5 5 – – – – – – – – – – – – – – – –

Jan 5 4 – – – – – – – – – – – – – – – –

Feb 5 5 – – – – – – – – – – – – – – – –

Table 15 (B) : Combined Mosquito Larval Density at Dudhli locality (L-3) of Doon Valley during March 2003 to February 2004



recovered Month

Fixed Random

No. of dips


Mar 5 5 50 2 3 2 2 3.80 – 1.80 4.50 – 1.50 – – 1 – 1

Apr 5 8 65 3 5 2 3 4.07 – 2.30 4.07 0.61 2.15 – – 1 – 1

May 5 10 75 2 8 3 5 5.00 – 3.0 4.00 1.13 2.46 1.33 – 1 1 1

Jun 5 15 100 4 10 2 10 5.50 – 3.0 4.75 0.75 2.25 1.60 – 2 1 1

Jul 5 15 100 4 12 3 10 6.00 – 2.45 5.50 0.85 4.00 2.25 2.95 3 1 1

Aug 5 19 120 3 17 2 15 – – 2.12 6.25 0.50 4.16 – 5.00 4 1 1

Sep 5 15 100 3 11 2 10 5.50 – 1.90 5.00 – 4.00 – 5.00 3 1 1

Oct 5 12 85 2 8 2 5 3.52 – 1.17 3.82 – 2.64 1.64 4.11 2 1 1

Nov 5 7 60 2 5 1 3 2.91 – – 3.75 – 2.66 1.25 – 2 1 1

Dec 5 5 – – – – – – – – – – – – – – – –

Jan 5 4 – – – – – – – – – – – – – – – –

Feb 5 5 – – – – – – – – – – – – – – – –

Table 16 (A) : Combined Mosquito Larval Density at Lacchiwala locality (L-4) of Doon Valley during March 2002 to February 2003



recovered Month

Fixed Random

No. of dips


Mar 5 3 40 3 2 2 1 3.12 – 1.87 2.50 – 4.37 – – 1 – 1

Apr 5 5 50 3 4 3 2 4.00 – 2.70 5.00 – 5.00 – – 1 1 –

May 5 8 65 2 7 2 6 5.76 – 2.69 6.92 – 4.61 – – 1 1 1

Jun 5 12 85 3 10 3 7 5.88 2.35 3.82 5.88 – 4.41 – 2.64 2 1 1

Jul 5 13 90 4 11 4 10 – 3.61 3.88 5.82 – 4.16 – 5.55 2 1 1

Aug 5 17 110 4 15 4 12 – 3.18 1.81 5.90 – 5.00 – 5.00 3 1 1

Sep 5 13 90 4 10 4 8 2.77 2.77 1.77 5.83 – 2.88 – 4.55 3 1 1

Oct 5 10 75 3 7 3 5 2.80 – 1.66 5.33 – 3.66 – 3.33 2 1 1

Nov 5 6 55 3 5 2 4 2.72 – 0.90 4.54 – 2.72 – – 2 1 1

Dec 5 5 – – – – – – – – – – – – – – – –

Jan 5 4 – – – – – – – – – – – – – – – –

Feb 5 4 – – – – – – – – – – – – – – – –

Table 16 (B) : Combined Mosquito Larval Density at Lacchiwala locality (L-4) of Doon Valley during March 2003 to February 2004



recovered Month

Fixed Random

No. of dips


Mar 5 2 35 3 1 3 1 4.28 – 2.85 – – 5.00 – – 1 – 1

Apr 5 5 50 3 3 3 2 5.0 – 2.90 4.50 – 4.50 – – 1 1 1

May 5 7 60 3 4 3 3 5.83 – 1.66 5.83 – 5.00 – – 1 1 –

Jun 5 10 75 4 8 3 6 5.33 – 4.66 6.00 – 5.33 – 2.66 2 1 1

Jul 5 12 85 4 10 4 8 – 2.35 5.30 5.87 – 5.58 – 4.37 3 1 1

Aug 5 15 100 4 15 4 13 – 2.75 3.75 6.00 – 625 – 6.00 3 1

Sep 5 13 90 3 10 2 9 3.61 3.44 3.33 6.71 – 3.88 – 3.88 2 1 1

Oct 5 9 70 3 6 3 2 2.85 – 2.78 5.64 – 4.14 – 3.21 1 1 1

Nov 5 6 55 2 4 1 1 2.27 – 1.36 4.01 – 4.00 – – 1 – 1

Dec 5 4 – – – – – – – – – – – – – – – –

Jan 5 4 – – – – – – – – – – – – – – – –

Feb 5 2 – – – – – – – – – – – – – – – –

Table 17 (A) : Combined Mosquito Larval Density at Gularghati locality (L-5) of Doon Valley during March 2002 to February 2003



recovered Month

Fixed Random

No. of dips


Mar 5 6 55 3 3 3 2 1.81 – 0.90 2.27 – 2.72 – – 1 – 1

Apr 5 6 55 3 4 3 2 3.62 – 1.36 4.36 1.18 3.81 – – 1 – 1

May 5 9 70 2 7 2 6 3.92 – 1.07 5.00 1.21 4.28 – – 1 1 1

Jun 5 11 80 3 9 3 7 6.25 – 2.0 5.26 1.25 4.06 – – 2 1 1

Jul 5 14 95 4 12 4 11 3.68 2.63 2.10 5.62 1.21 4.21 – 2.63 2 1 1

Aug 5 19 120 4 16 4 14 – 4.62 1.96 6.84 0.83 4.16 – 3.33 3 1 2

Sep 5 15 100 3 11 3 10 2.75 5.00 1.75 5.00 – 7.50 – 4.50 3 1 2

Oct 5 12 85 3 9 3 7 2.35 2.35 1.25 4.79 – 3.05 – 3.52 2 1 1

Nov 5 8 65 2 5 1 3 1.92 – 0.76 3.84 – 2.69 – – 2 1 1

Dec 5 5 – – – – – – – – – – – – – – – –

Jan 5 4 – – – – – – – – – – – – – – – –

Feb 5 4 – – – – – – – – – – – – – – – –

Table 17 (B) : Combined Mosquito Larval Density at Gularghati locality (L-5) of Doon Valley during March 2003 to February 2004



recovered Month

Fixed Random

No. of dips


Mar 5 5 50 3 2 3 1 2.70 – 1.70 2.50 1.50 2.50 – – 1 1 1

Apr 5 7 60 3 4 3 2 2.91 – 2.08 3.33 1.50 2.66 – – 1 – 1

May 5 7 60 4 4 3 4 4.16 – 2.25 5.00 1.50 – – – 1 1 1

Jun 5 10 75 3 8 3 6 4.66 – 2.60 5.00 0.93 2.66 – – 2 1 1

Jul 5 15 100 4 10 4 8 3.50 2.00 2.25 5.00 1.00 2.90 – 3.00 2 1 1

Aug 5 15 100 4 11 4 10 – 3.00 2.00 6.25 – 3.50 – 5.00 3 1 1

Sep 5 10 75 3 7 2 5 3.33 1.66 2.66 6.00 – 3.33 – 6.00 3 1 1

Oct 5 5 50 3 3 2 1 4.00 – 2.25 4.00 – 3.50 – 4.00 2 1 1

Nov 5 3 40 2 2 2 1 3.75 – 1.87 3.75 – – – – 2 1 1

Dec 5 5 – – – – – – – – – – – – – – – –

Jan 5 5 – – – – – – – – – – – – – – – –

Feb 5 5 – – – – – – – – – – – – – – – –

Table 18 (A) : Natural infection in Anopheles larvae at Asan Barrage locality (L-1) of Doon Valley during March 2002 to February 2003

PI TA DR RF IC

Month No. Exam P N F Ao No.

Exam P N F Ao No. Exam P N F Ao No.

Exam P N F Ao No. Exam P N F Ao

Mar 20 – – – – 20 – – – – 10 – – – – – – – – – 8 – – – –

Apr 50 6.0 4.0 – – 30 3.33 – – – 20 – – – 10.00 – – – – – 15 – – – –

May 40 5.00 – 5.00 2.50 50 4.0 – – 2.0 30 6.66 – 3.13 6.66 – – – – – 25 – – – –

Jun 90 7.77 3.33 2.22 3.33 70 7.14 2.85 5.71 – 22 4.54 9.0 – – 40 5.0 2.50 – 5.0 40 2.50 – 2.50 –

Jul 100 11.00 3.00 4.00 – 80 12.50 3.75 8.75 2.50 20 15.0 5.0 5.0 – 50 8.0 2.0 4.0 4.0 70 5.71 – 4.28 2.85

Aug 110 15.43 3.65 2.76 1.81 – – – – – 30 6.66 – – 6.66 70 10.0 4.28 5.71 4.28 80 12.30 2.50 – –

Sep 80 8.75 1.25 – – 60 11.66 1.66 5.0 3.33 20 5.0 – 5.0 – 50 6.0 – 2.0 – 40 5.0 – – 5.00

Oct 50 – – – 6.0 40 7.50 – – 5.0 10 – – – – – – – – – 30 3.33 – – –

Nov 30 3.33 3.33 – – 30 6.66 – – – 10 – – – – – – – – – 20 – – – –

Dec – – – – – – – – – – – – – – – – – – – – – – – – –

Jan – – – – – – – – – – – – – – – – – – – – – – – – –

Feb – – – – – – – – – – – – – – – – – – – – – – – – –

Total 675 380 177 310 348

Table 18 (B) : Natural infection in Anopheles larvae at Asan Barrage (L-1) locality of Doon Valley during March 2003 to February 2004

PI TA DR RF IC




Mar 15 – – – – 20 – – – – 8 – – – – – – – – – 10 – – – –

Apr 40 5.0 2.50 – 2.50 30 9.99 – – – 12 – – – – – – – – – 15 – – – –

May 50 6.0 2.0 – – 60 6.66 3.32 – 1.66 28 10.71 – – 3.57 – – – – – 35 – – – 5.71

Jun 80 6.25 2.25 1.25 1.25 60 5.00 1.66 5.00 3.22 40 10.0 2.50 2.50 – 30 10.00 3.33 – 10.0 45 4.44 2.22 – –

Jul 100 9.00 3.00 2.0 4.00 80 5.00 2.50 5.00 1.25 35 8.54 – 2.85 – 60 6.66 3.33 1.66 6.66 40 2.50 – – 2.50

Aug 120 14.16 4.16 2.50 2.50 – – – – – 30 – – – 6.66 80 7.56 3.75 2.50 – 60 5.0 – – –

Sep 70 8.57 2.87 2.87 – 60 3.33 1.66 – 3.33 25 4.0 4.0 – – 40 7.50 2.50 2.50 5.0 30 – 3.33 – –

Oct 40 2.50 – 2.50 – 25 4.00 – – 4.00 20 10.00 – – 10.00 – – – – – 22 4.54 – – –

Nov 30 – 3.33 – 3.33 20 – – – – 15 – – – – – – – – – 12 – – – –

Dec – – – – – – – – – – – – – – – – – – – – – – – – –

Jan – – – – – – – – – – – – – – – – – – – – – – – – –

Feb – – – – – – – – – – – – – – – – – – – – – – – – –

Total 545 355 213 210 269

Table 19 (A) : Natural infection in Anopheles larvae at Sahaspur (L-2) locality of Doon Valley during March 2002 to February 2003

PI TA DR RF IC




Mar 25 8.0 – – – 20 5.0 – – 5.0 10 – – – – – – – – – 10 – – – –

Apr 35 5.71 2.85 – 2.85 30 6.66 – – – 15 6.66 – – 6.66 – – – – – 25 8.00 – – 4.00

May 50 6.0 – – 6.00 45 6.66 2.22 2.22 – 25 8.00 4.00 – – – – – – – 30 10.00 3.33 – 3.33

Jun 75 9.33 5.33 5.33 2.66 60 8.33 3.33 3.33 5.00 33 12.12 3.03 6.06 – – – – – – 38 10.52 5.26 5.26 –

Jul 90 11.11 3.33 5.55 3.33 78 8.97 5.13 – 2.56 40 10.00 5.00 – – 30 10.00 3.33 3.33 6.66 30 6.66 3.33 – –

Aug 120 9.16 3.33 1.66 4.16 – – – – – 25 12.00 4.00 4.00 – 70 8.57 4.28 2.85 – 52 7.70 3.84 1.92 –

Sep 80 7.50 – – 3.50 70 7.14 2.85 2.85 – 20 10.00 – – 10.00 90 7.37 2.22 3.33 4.44 26 3.70 – – –

Oct 65 6.15 1.53 – – 55 5.45 – 1.81 3.62 20 50 – – 5.00 60 6.66 – 3.33 8.33 33 6.06 – 3.03 3.03

Nov 30 – – 3.33 – 28 – 3.60 – 7.20 10 – – – – – – – – – 20 – – – –

Dec – – – – – – – – – – – – – – – – – – – – – – – – –

Jan – – – – – – – – – – – – – – – – – – – – – – – – –

Feb – – – – – – – – – – – – – – – – – – – – – – – – –

Total 570 386 198 250 264

Table 19 (B) : Natural infection in Anopheles larvae at Sahaspur (L-2) locality of Doon Valley during March 2003 to February 2004

PI TA DR RF IC




Mar 20

10.00 – – 5.00 27 7.40 – – – 7 – – – – – – – – – 10 – – – –

Apr – – – – – 30 6.66 – – 3.33 10 – – – – – – – – – 10 – – – –

May 25 8 – – – 52 5.77 – 3.84 1.94 20 10 – – – – – – – – 21 4.76 – 4.76 5.71

Jun 50 8 2.00 4.00 2.00 60 8.33 1.66 – 6.66 33 6.06 – – 3.03 3.80 5.80 2.90 – 2.90 26 7.69 – – 3.84

Jul 72 6.94 2.84 4.16 – 67 6.00 2.98 4.47 – 20 15.00 5.00 – – 65 6.15 3.07 3.07 – 22 – 4.54 9.08 –

Aug 105 10.47 3.80 6.66 4.76 85 3.52 3.52 5.90 4.70 22 4.54 – – 1.08 72 6.94 1.39 4.16 1.39 40 3.50 2.25 – –

Sep 82 8.78 – 3.66 4.87 92 5.43 2.17 – 2.17 20 10.00 5.00 – – 52 3.04 – 3.84 5.77 29 6.90 3.45 3.45 –

Oct 55 3.63 1.81 – – 55 3.63 1.81 1.81 – 15 – – – – – – – – – 10 – – – –

Nov – – – – – 28 – – – 10.71 10 – – – – – – – – – 15 – – – –

Dec – – – – – – – – – – – – – – – – – – – – – – – – –

Jan – – – – – – – – – – – – – – – – – – – – – – – – –

Feb – – – – – – – – – – – – – – – – – – – – – – – – –

Total 409 496 167 226 183

Table 2 : Diversity of snails in selected localities of Doon Valley during March 2002 to February 2004

Collection Sites L1 L2 L3 L4 L5

Total Snail’s species

2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 Family : Lymnaeidae Lymnaea (Pseudosuccinea) acuminata f. chlamys (Benson, 1836)

265 292 – – – – – – – – 265 292

Lymnaea (Pseudosuccinea) acuminata f. patula (Troschel, 1837)

181 208 – – 89 101 – – – – 270 310

Lymnaea sp. – – 205 201 – – – – – – 205 201 Family : Viviparidae Bellamya bengalensis f. typica (Lamarck, 1882)

– – 157 200 – – – – – – 157 200

Bellamya dissimilis (Mueller, 1774) – – 116 146 – – – – – – 116 146

Family : Thiaridae Thiara (Melanoides) tuberculata (Mueller, 1774)

300 320 395 422 344 370 419 458 392 409 1850 1979

Thiara sp. – – – – 209 205 278 305 172 182 659 792 Family : Planorbidae Indoplanorbis exustus (Deshayes, 1834) 105 104 – – – – – – – – 105 104

Total 851 924 873 969 642 676 697 763 564 591 3639 4011

L1

Lymnaea (P) acuminata f. chlamys Benson

Lymnaea (P) acuminata f. patula Troschel

Thiara (M) tuberculata Mueller

Indoplanorbis exustus Deshayes

Species→

Months↓ 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04

Total

Mar. 26 27 16 16 28 29 8 11 161

Apr. 29 27 23 19 32 34 9 9 182

May 31 38 25 23 28 32 10 8 195

Jun. 36 36 23 20 30 31 11 11 198

Jul. 23 22 13 13 24 21 7 9 132

Aug. 13 18 7 13 14 20 5 4 94

Sep. 12 19 9 17 20 29 7 5 118

Oct. 22 22 16 20 38 35 7 7 167

Nov. 19 22 13 25 23 25 12 11 150

Dec. 16 21 12 16 13 19 15 14 126

Jan. 16 18 11 10 23 19 6 7 110

Feb. 22 21 14 16 27 23 8 7 138

Total 265 291 182 208 300 317 105 103 1771

L1 (Percentage)

Lymnaea (P) acuminata f. chlamys Benson

Lymnaea (P) acuminata f. patula Troschel

Thiara (M) tuberculata Mueller

Indoplanorbis exustus Deshayes

Species→

Months↓ 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04

Mar. 9.81 9.28 8.79 7.69 10.14 9.15 7.62 10.68

Apr. 10.94 9.28 12.64 9.13 11.59 10.73 8.57 8.74

May 11.70 13.06 13.74 11.06 1.45 10.09 9.52 7.77

Jun. 13.58 12.37 12.64 9.62 10.87 9.78 10.48 10.68

Jul. 8.68 7.56 7.14 6.25 8.70 6.62 6.67 8.74

Aug. 4.91 6.19 3.85 6.25 5.07 6.31 4.76 3.88

Sep. 4.53 6.53 4.95 8.17 7.25 9.15 6.67 4.85

Oct. 8.30 7.56 8.79 9.62 13.77 11.04 6.67 6.80

Nov. 7.17 7.56 7.14 12.02 8.33 7.89 11.43 10.68

Dec. 6.04 7.22 6.59 7.69 4.71 5.99 14.29 13.59

Jan. 6.04 6.19 6.04 4.81 8.33 5.99 5.71 6.80

Feb. 8.30 7.22 7.69 7.69 9.78 7.26 7.62 6.80

L2

Bellamya bengalensis f. typica Lamarck

Bellamya dissimilis (Mueller) Thiara (M) tuberculata Mueller

Lymnaea sp. Species→ Months↓

2002-03 2003-04 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04

Total

Mar. 25 28 12 14 31 35 15 16 176 Apr. 22 25 14 17 39 50 18 18 203 May 23 23 12 13 41 46 21 20 199 Jun. 18 22 9 9 40 42 21 18 179 Jul. 13 19 8 7 23 39 11 10 130 Aug. – 7 – 5 20 22 13 12 79 Sep. 7 8 5 8 28 28 19 18 121 Oct. 7 13 6 7 36 37 18 20 144 Nov. 10 16 11 11 47 29 16 16 156 Dec. 7 15 7 13 33 31 16 14 136 Jan. 10 13 17 19 28 28 17 19 151 Feb. 14 11 13 23 32 35 20 20 168 Total 156 200 114 146 398 422 205 201 1842

L3

Thiara (M) tuberculata Mueller Thiara sp. Lymnaea (P) acuminata f. patula Troschel

Species→

Months↓ 2002-03 2003-04 2002-03 2003-04 2002-03 2003-04

Total

Mar. 25 32 19 18 12 12 118 Apr. 32 36 23 25 17 13 146 May 40 41 26 22 11 14 154 Jun. 42 45 27 19 9 12 154 Jul. 34 40 20 17 3 6 120 Aug. 28 32 16 14 – 3 93 Sep. 22 24 13 19 5 5 88 Oct. 30 31 18 21 5 7 112 Nov. 24 27 12 16 7 8 94 Dec. 18 21 9 15 3 5 71 Jan. 20 18 10 7 7 7 69 Feb. 27 23 16 2 10 9 87 Total 342 370 209 195 89 101 1306

L4 Thiara (M) tuberculata Mueller Thiara sp. Species→

Months↓ 2002-03 2003-04 2002-03 2003-04

Total

Mar. 31 43 24 28 126

Apr. 44 54 26 32 156

May 48 5 33 42 128

Jun. 60 55 35 36 186

Jul. 45 48 30 27 150

Aug. 22 27 20 20 89

Sep. 26 31 23 24 104

Oct. 29 39 19 29 116

Nov. 37 33 17 22 109

Dec. 18 25 11 18 72

Jan. 26 20 19 10 75

Feb. 32 22 23 16 93

Total 418 402 280 304 1404

L5

Thiara (M) tuberculata Mueller Thiara sp. Species→

Months↓ 2002-03 2003-04 2002-03 2003-04

Total

Mar. 32 35 14 14 95

Apr. 39 42 15 17 113

May 46 49 22 24 141

Jun. 50 53 18 20 141

Jul. 38 32 11 16 97

Aug. 24 29 12 12 77

Sep. 31 27 16 12 86

Oct. 36 33 17 18 104

Nov. 23 35 13 16 87

Dec. 22 25 11 11 69

Jan. 21 18 10 10 59

Feb. 30 29 13 12 84

Total 392 407 172 182 1146

Table 2 : Faunal diversity of snails in riverine ecosystem of Doon Valley from March 2002 to February 2004

Name of the species Asan Barrage

Sahaspur Dudhli Lacchiwala Gularghati Total

March 2002 to Feb. 2003 Lymnaea (P) acuminate f. chlamys 292 – – – – 292

Lymnaea (P) acuminate f. patula 208 – 89 – – 297

Lymnaea sp. – 205 – – – 205

Bellamya bengalensis – 157 – – – 157

Bellamya dissimilis – 113 – – – 113

Thiara (M) tuberculata 320 339 332 419 392 1802

Thiara sp. – – 218 278 172 668

Indoplanorbis exustus 106 – – – – 106



Lymnaea sp.

– 201 – – – 201


– 200 – – – 200

Bellamya dissimilis

– 145 – – – 145

Thiara (M) tuberculata 300 442 370 458 400 1950

Thiara sp.

– – 205 305 182 792


105 – – – – 105

Table 2 : Faunal diversity of snails in riverine ecosystem of Doon Valley from March 2002 to February 2004

Name of the species Asan Barrage

Sahaspur Dudhli Lacchiwala Gularghati Total



Lymnaea sp.

– 205 – – – 205


– 157 – – – 157

Bellamya dissimilis

– 113 – – – 113

Thiara (M) tuberculata

320 339 332 419 392 1802

Thiara sp.

– – 218 278 172 668


106 – – – – 106



Lymnaea sp.

– 201 – – – 201


– 200 – – – 200

Bellamya dissimilis

– 145 – – – 145


300 442 370 458 400 1950

Thiara sp.

– – 205 305 182 792


105 – – – – 105

Table 28 : Chemical Characteristics of two different rearing media

Rearing Medium

Snail water Parameters

Tap water Lymnaea (P)

acuminata f. chlamys



f. typica

pH (moles/l) 7.05 8.1 7.05 7.10

Total hardness (mg/l) 31.6 44.2 39.5 42.3

Dissolved oxygen (mg/l) 5.4 5.2 4.5 3.6

Nitrogen ammonia (mg/l) 4.2 6.1 5.9 5.4

Nitrogen nitrite (mg/l) 1.05 1.8 1.3 0.9

Nitrogen nitrate (mg/l) 3.8 5.6 5.1 4.2

Table 20 (A) : Natural infection in Anopheles larvae at Dudhli (L-3) locality of Doon Valley during March 2002 to February 2003

PI TA DR RF IC




Mar 32 12.50 – 3.12 3.12 30 6.66 – 3.33 – 13 – – – – – – – – – 15 – – – –

Apr 40 5.00 2.50 – – 43 4.65 – 4.65 2.32 25 8.00 4.00 – – – – – – – 22 8.00 – – 9.09

May 55 5.45 – – 1.81 62 6.45 1.61 – 3.22 22 9.09 – 13.13 – – – – – – 30 10.00 – 3.33 –

Jun 82 6.09 2.44 – 3.65 75 8.00 2.66 1.33 – 37 8.10 2.70 5.40 5.40 52 5.77 1.92 – 3.84 58 7.0 5.72 – –

Jul 105 6.66 2.85 2.85 1.90 98 8.17 2.04 3.61 1.02 32 12.50 – – 9.31 88 9.09 3.40 2.27 3.40 72 6.94 – 2.77 2.77

Aug 120 7.50 3.33 5.83 5.00 – – – – – 40 10.00 5.00 – 2.25 110 6.36 2.72 2.72 3.63 75 5.33 – 1.33 3.99

Sep 92 3.26 2.44 3.66 2.44 105 5.71 1.90 – – 28 – – 7.14 7.14 98 5.10 – 2.04 – 60 1.66 3.32 – –

Oct 45 – 2.22 – 2.22 63 6.35 – 3.17 1.58 18 5.55 – – 5.55 45 – 4.44 – 8.88 42 – – – 4.76

Nov 33 6.06 – 3.03 – 35 – – – – 12 – – – – – – – – – 37 – – – –

Dec – – – – – – – – – – – – – – – – – – – – – – – – –

Jan – – – – – – – – – – – – – – – – – – – – – – – – –

Feb – – – – – – – – – – – – – – – – – – – – – – – – –

Total 604 511 247 393 411

Table 20 (B) : Natural infection in Anopheles larvae at Dudhli (L-3) locality of Doon Valley during March 2003 to February 2004

PI TA DR RF IC




Mar 28

14.28 – – 7.04 30 – – 6.66 – 12 – – – – – – – – – 10 – – – –

Apr 43 6.97 – 2.32 2.32 40 5.00 – 2.25 5.00 20 5.00 – – 5.00 – – – – – 20 – – – –

May 60 – 1.66 – 3.98 58 5.17 – – 3.44 35 5.85 – 2.92 – – – – – – 42 7.14 – – –

Jun 80 6.25 2.50 – – 80 6.25 3.75 – 2.25 42 4.76 2.38 – 2.38 – – – – – 42 7.14 – 2.38 4.76

Jul 95 7.36 2.10 4.21 2.10 105 6.66 2.85 1.90 – 30 10.00 3.33 – 6.66 50 4.00 2.00 – 2.00 65 6.15 – 3.07 –

Aug 120 8.33 3.33 1.66 – – – – – – 45 8.88 – 4.44 2.22 100 7.00 3.00 – 4.00 82 7.31 – 2.43 2.45

Sep 82 4.87 – 3.65 2.43 88 4.54 2.27 2.27 3.40 28 7.14 3.42 – 7.14 80 6.25 2.25 3.75 2.25 64 6.25 – 3.12 –

Oct 48 2.08 2.08 – 4.16 40 5.00 – – 2.25 12 8.33 – – 8.33 55 3.33 – 3.33 – 30 – – – 3.33

Nov 35 – – 2.85 7.55 25 – – – 8.00 10 – – – – – – – – – 22 9.09 – – –

Dec – – – – – – – – – – – – – – – – – – – – – – – – –

Jan – – – – – – – – – – – – – – – – – – – – – – – – –

Feb – – – – – – – – – – – – – – – – – – – – – – – – –

Total 591 466 224 285 360

Table 21 (A) : Natural infection in Anopheles larvae at Lacchiwala (L-4) locality of Doon Valley during March 2002 to February 2003

PI TA DR RF IC




Mar 15 – – – – 20 – – – – 10 – – – – – – – – – 25 – – – –

Apr 37 – – – 5.67 32 6.25 – – 3.12 18 – – – – – – – – – 40 – – – –

May 78 5.13 2.28 4.56 – 63 4.76 1.58 3.06 – 25 8.00 – 4.00 4.00 – – – – – 45 – – – –

Jun 80 6.25 2.50 – 3.75 84 6.00 2.38 – 2.38 49 6.12 2.04 2.04 – 35 5.71 – 5.71 – 55 – – – –

Jul 92 4.35 2.17 2.17 1.08 – – – – – 58 7.69 3.84 – 1.92 78 5.13 1.28 1.28 2.56 63 3.17 – – –

Aug 115 4.35 2.60 – 3.50 – – – – – 32 9.37 – 6.25 – 92 6.25 2.17 – 2.17 75 – 1.33 2.66 –

Sep 85 8.23 2.35 1.17 2.35 37 8.10 2.70 2.70 – 25 8.00 – – 4.00 66 4.54 1.51 3.03 – 48 – – – –

Oct 68 5.90 – – 2.95 28 3.60 – – 3.60 18 – – – 5.55 30 3.33 – – 6.66 30 3.33 – – 6.66

Nov 32 – – – 6.25 20 – – – – 10 – – – – – – – – – 22 – – – –

Dec – – – – – – – – – – – – – – – – – – – – – – – – –

Jan – – – – – – – – – – – – – – – – – – – – – – – – –

Feb – – – – – – – – – – – – – – – – – – – – – – – – –

Total 602 284 245 301 413

Table 21 (B) : Natural infection in Anopheles larvae at Lacchiwala (L-4) locality of Doon Valley during March 2003 to February 2004

PI TA DR RF IC




Mar – – – – – 25 8.00 – – 4.00 12 – – – – – – – – – 20 – – – –

Apr 30 6.66 – – – 42 4.76 – 2.38 – 20 – – – – – – – – – 42 – – – –

May 65 6.66 1.53 3.07 – 58 5.17 1.72 – 3.44 30 3.33 – – 3.33 – – – – – 45 – – – –

Jun 72 4.16 1.38 – 2.77 70 7.14 1.85 1.85 – 58 – – 3.45 – 30 6.66 – 1.33 – 68 – – – –

Jul 80 5.00 – 1.25 1.25 – – – – – 72 4.16 1.39 – 1.39 62 4.84 1.61 1.61 3.22 73 – – – –

Aug 120 5.00 1.66 1.66 2.50 – – – – – 55 3.63 – 2.81 – 103 4.85 2.42 – 2.91 90 – – – –

Sep 94 7.45 2.12 – 2.12 45 6.66 – – 6.66 42 2.38 – – 2.38 54 3.70 – 3.70 – 49 – – – –

Oct 62 4.83 – – 3.22 32 6.25 – 3.12 6.25 20 – – – – 28 3.60 – – – 35 – – – –

Nov 35 – 2.85 5.70 – 20 – – – 5.00 10 – – – – – – – – – 28 – – – –

Dec – – – – – – – – – – – – – – – – – – – – – – – – –

Jan – – – – – – – – – – – – – – – – – – – – – – – – –

Feb – – – – – – – – – – – – – – – – – – – – – – – – –

Total 558 292 319 287 450

Table 22 (A) : Natural infection in Anopheles larvae at Gularghati (L-5) locality of Doon Valley during March 2002 to February 2003

PI TA DR RF IC




Mar 20 – – – 5.00 15 – – – – 8 – – – – – – – – – 20 – – – –

Apr 35 – – – – 25 4.00 – – – 10 – – – – – – – – – 38 – – – –

May 60 3.33 1.66 1.66 - 40 5.00 – 5.00 – 10 – – – – – – – – – 45 4.44 – 2.22 –

Jun 72 4.25 – 2.77 – 84 4.76 1.19 2.38 2.38 26 – - – – – – – – – 55 5.45 1.81 – –

Jul 115 6.08 2.40 – 0.80 62 4.83 – 1.61 – 32 – – – – 40 5.00 2.25 2.25 – 62 3.22 1.61 – 1.61

Aug 124 5.64 1.61 0.80 1.61 – – – – – 37 – – – – 65 4.61 3.07 – 1.53 80 5.00 – 1.25 –

Sep 75 5.33 – 1.33 – 40 5.00 2.25 5.00 – 28 – – – – 78 6.41 2.56 1.28 – 98 4.08 2.04 – –

Oct 64 3.12 – – 1.56 28 – – 7.12 3.57 15 – – – – 48 4.16 – 2.08 – 32 6.25 – – –

Nov 42 – 2.38 – 4.76 15 – – – – 8 – – – – – – – – – 25 – – – –

Dec – – – – – – – – – – – – – – – – – – – – – – – – –

Jan – – – – – – – – – – – – – – – – – – – – – – – – –

Feb – – – – – – – – – – – – – – – – – – – – – – – – –

Total 507 319 166 231 455

Table 22 (B) : Natural infection in Anopheles larvae at Gularghati (L-5) locality of Doon Valley during March 2003 to February 2004

PI TA DR RF IC




Mar 18 – – – – 20 8.00 – – – 10 – – – – – – – – – 18 – – – –

Apr 34 5.88 – – – 28 3.57 – 3.57 – 20 – – – – – – – – – 24 4.16 – – 4.16

May 52 3.84 – 1.92 – 47 4.25 2.12 – 2.12 22 – – – – – – – – – – – – – –

Jun 65 4.61 1.53 1.53 – 64 6.25 1.56 1.56 – 28 7.14 – – – – – – – – 31 6.45 – – –

Jul 84 4.76 1.90 – 1.90 55 7.27 3.63 – – 35 – – – – 43 6.97 – 4.65 – 38 7.90 – 2.63 –

Aug 105 5.71 2.65 0.95 – – – – – – 33 – – – – 84 4.76 2.38 – 3.57 57 7.01 1.75 1.75 –

Sep 78 6.89 – 3.44 1.72 44 – – 6.81 2.27 30 3.33 3.33 – – 67 5.96 1.49 2.98 – 42 7.13 2.34 – –

Oct 45 4.44 2.22 – – 32 5.00 – – 5.00 19 – – – – 32 6.25 – 3.08 3.08 28 3.57 – 3.57 –

Nov 24 – – 4.16 4.16 23 4.35 – – – 10 – – – – – – – – – – – – – –

Dec – – – – – – – – – – – – – – – – – – – – – – – – –

Jan – – – – – – – – – – – – – – – – – – – – – – – – –

Feb – – – – – – – – – – – – – – – – – – – – – – – – –

Total 415 313 207 226 238

Table 29 : Mean duration (h ± SE) and % mortality in adult stage of Anopheles stephensi reared in tap water and tap

water with Scavenger snail’s [Lymnaea (P.) acuminata] secretion

Rearing Medium

Number of newly hatched larvae released

Larval instar Mean no. of larval stages

Duration of larval stage

% mortality of larval stage

Total mean duration of larval stage

Total mortality

Ist – 31.6 ± 0.9 2.0 IInd 49.0 ± 0.6 35.3 ± 0.6 1.3 IIIrd 48.3 ± 0.1 50.0 ± 0.6 3.5

Snail’s water 150

IVth 46.6 ± 0.3 54.3 ± 0.1 4.3

169.0 11.5

Ist – 36.3 ± 0.1 4.6 IInd 47.6 ± 0.3 38.0 ± 0.6 2.8 IIIrd 46.3 ± 0.1 53.3 ± 0.1 9.0

Tap water 150

IVth 42.3 ± 0.1 62.6 ± 0.9 9.3

190.2 25.7

Table 30 : Mean duration (h ± SE) and % mortality in adult stage of Anopheles stephensi reared in tap water and tap

water with Scavenger snail’s [Thiara (M.) tuberculata] secretion

Rearing Medium






Total mortality

Ist – 34.6 ± 0.8 3.3 IInd 48.3 ± 0.01 36.3 ± 0.6 2.7 IIIrd 47.0 ± 0.6 53.6 ± 0.9 4.3

Snail water 150

IVth 45 ± 0.6 56.3 ± 0.9 5.1

180.8 15.4

Ist – 36.3 ± 0.1 4.6 IInd 47.6 ± 0.3 38.0 ± 0.6 2.8 IIIrd 46.3 ± 0.1 53.3 ± 0.1 9.0

Tap water 150

IVth 42.3 ± 0.1 62.6 ± 0.9 9.3

190.2 25.7

Table 31 : Mean duration (h ± SE) and % mortality in adult stage of Anopheles stephensi reared in tap water and tap water with Scavenger snail’s (Bellamya bengalensis) secretion

Rearing Medium






Total mortality

Ist – 34.0 ± 1.1 4.6 IInd 47.0 ± 0.6 36.3 ± 0.8 2.1 IIIrd 47.0 ± 0.6 53.0 ± 0.6 5.6

Snail water 150

IVth 45 ± 0.6 57.0 ± 0.9 6.0

180.8 18.3

Ist – 36.3 ± 0.1 4.6 IInd 47.6 ± 0.3 38.0 ± 0.6 2.8 IIIrd 46.3 ± 0.1 53.3 ± 0.1 9.0

Tap water 150

IVth 42.3 ± 0.1 62.6 ± 0.9 9.3

190.2 25.7

Table 1 (A) : Climatological data* of the Doon Valley between March, 2002 to February, 2003

Temperature (0C) Average Humidity Month No. of Rainfall days

Rainfall (mm) Max. Min. Mean Max. Min.

March, 2002 2 63.1 27 10.8 18.9 90 41

April 3 65.6 32.7 14.4 23.5 73 29

May 4 28.7 35.3 18.9 26.4 73 39

June 12 134.2 35.8 21.1 26.7 78 54

July 8 121.5 32.8 22.7 27.1 86 64

August 18 483.3 30.3 22.7 25.8 93 75

September 11 275.9 29.2 13.3 23.2 92 70

October 5 54.9 29.2 13.3 20.8 93 52

November 0 0.0 25.8 8.1 16.5 96 45

December 0 0.3 22.8 04.8 13.1 98 43

January, 2003 4 36.0 19.7 03.3 11.1 99 45

February 5 79.8 21.5 06.7 14.1 96 44

Total 84 1343.3 342.1 160.1 247.2 1067 601 * Source of Data : Environment & Ecology Division , Forest Research Institute, P.O. New Forest, Dehradun

Table 1 (B) : Climatological data* of the Doon Valley between March, 2003 to February, 2004

Temperature (0C) Average Humidity Month No. of Rainfall days

Rainfall (mm) Max. Min. Mean Max. Min.

March, 2003 3 52.0 25.9 09.9 17.8 90 41

April 2 10.6 33.1 13.7 23.4 72 28

May 2 19.9 35.4 15.9 25.0 63 27

June 8 140.8 35.5 21.6 27.6 75 46

July 14 410.2 31.7 22.9 26.6 90 74

August 25 625.0 30.7 22.5 26.0 94 76

September 17 403.7 30.1 20.6 24.8 93 71

October 0 0.0 29.5 11.7 20.1 91 44

November 1 06.4 25.3 7.0 15.7 96 46

December 4 20.6 21.7 05.1 12.8 98 49

January, 2004 2 97.5 19.9 04.6 11.7 97 52

February 1 24.4 23.4 06.7 14.9 97 43

Total 79 1811.3 342.2 162.8 246.4 1056 597 * Source of Data : Environment & Ecology Division Forest Research Institute, P.O. New Forest, Dehradun

Table 23 : Physico-chemical and Biological Analysis of water samples at Asan Barrage (L-1) Locality of Doon Valley during January, 2003 to December, 2003

Macro-organism Micro-organism Month Depth

(cm) Temp. (00C)

pH Free CO2

(mg/l)

DO (mg/l) Zoobios Macrophytes Zooplankton Phytoplankton

January 15 16 7.2 2.9 7.5 Fish Eichornia, Typha Protozoan Diatom, algae

February 14 20 7.0 2.8 7.4 Fish snail Eichornia, Hydrilla, Typha

Protozoan, Copepods Algae

March 11 22 7.2 3.0 7.5 Snail Eichornia, Hydrilla, Vallisnaria, Typha

Protozoan, Copepod, Cladoceran

Diatoms

April 10 26 7.3 3.1 7.0 Chironomous larvae. snails

Eihornia, Hydrilla, Typha

Protozoan, Copepods Cladoceran

Algae, Diatoms

May 12 29 7.5 3.2 8.9 Chironomous larvae. fish

Eichornia, Hydrilla, Typha

Protozoan, Copepods –

June 8 30 7.4 3.3 6.8 Chironomous larvae. fish, frog

Eichornia, Hydrilla, Vallisnaria, Typha

Protozoan, Copepods –

July 7 27 7.3 3.2 7.4 Chironomous larvae. frog, snail


– Algae

August 7 25 7.2 3.3 7.7 Chironomous larvae. frog, snail


Copepod Algae

September 10 24 7.1 3.2 7.1 Frog, fish, snail Scripus, Typha, Eichornia, Hydrilla

Protozoan Diatoms, Algae

October 12 24 7.1 4.0 7.6 Fish, snail Eichornia, Hydrilla, Typha

Protozoan, Copepods Algae

November 12 21 7.1 2.7 7.5 Fish, snail Eichornia, Hydrilla, Typha

– Algae

December 15 19 7.1 2.8 7.5 Fish, snail Eichornia, Hydrilla, Typha

– –

Table 24 : Physico-chemical and Biological Analysis of water samples at Sahaspur (L-2) Locality of Doon Valley during January, 2003 to December, 2003


(cm) Temp. (00C)

pH Free CO2

(mg/l)


January 12 20 7.0 3.8 5.8 Snail Eichornia Protozoan Algae

February 15 22 6.9 3.7 5.7 Snail Eichornia, Scripus Rotifera, Protozoan Algae

March 13 24 7.2 4.0 5.6 Fish, snail, crab Hydrilla, Vallisnaria Protozoan, Copepods Algae

April 10 25 7.3 4.2 5.5 Fish. snails Eichornia Rotifera, Protozoan Algae

May 8 28 7.5 4.3 5.4 Fish. snails Eichornia Protozoan –

June 7 28 7.4 4.4 5.5 Frog, Tadpod, snail

Eichornia, Ceratophylum

Protozoan –

July 10 26 7.3 4.2 5.7 Frog, snail, tadpol

Pistia, Eichornia Protozoan. copepod Algae

August 11 25 7.1 4.1 6.0 – Eichornia – Algae

September 13 22 7.3 4.3 6.2 Frog, fish, snail Scripus, Typha, Eichornia, Hydrilla

Protozoan Diatoms, Algae

October 12 20 7.2 3.0 5.7 Fish, snail Eichornia, Pistia Copepods, Rotifers Algae

November 13 20 7.0 3.6 5.8 Fish, snail, crab Eichornia, Marsilia Protozoan Algae

December 15 17 7.0 3.7 5.5 Fish, snail Eichornia, Marsilia Protozoan Algae

Table 25 : Physico-chemical and Biological Analysis of water samples at Dudhli (L-3) Locality of Doon Valley during January, 2003 to December, 2003


(cm) Temp. (00C)

pH Free CO2

(mg/l)


January 16 19 7.8 6.3 7.8 Snail Ceratophyllum, Marsilia

– Algae

February 14 21 7.5 6.1 7.5 Snail Scirpus, Marsilia – –

March 11 23 7.6 6.4 7.6 Fish, snail Scirpus, Marsilia Protozoan –

April 13 24 8.0 6.6 7.3 Fish. snail, crab Marsilia Protozoan –

May 9.0 25 8.2 6.7 7.2 Fish. snail, crab – Protozoan –

June 10 28 8.1 6.8 7.3 Frog, snail – Copepod –

July 10 30 8.0 6.6 7.6 Snail Eichornia – Algae

August 9 27 8.0 6.5 7.8 Snail, Frog Eichornia – Algae

September 11 25 8.0 6.4 7.6 Frog, snail Eichornia – Algae

October 13 24 7.5 6.2 7.6 Fish, snail Eichornia, Protozoan Algae

November 14 21 7.6 6.0 7.3 Snails Eichornia, Marsilia Protozoan Algae

December 13 18 7.6 5.9 7.6 Snails Eichornia, Marsilia Protozoan Algae

Table 26 : Physico-chemical and Biological Analysis of water samples at Lacchiwala (L-4) Locality of Doon Valley during January, 2003 to December, 2003


(cm) Temp. (00C)

pH Free CO2

(mg/l)


January 14 20 8.0 1.9 7.8 Snail – – Algae

February 15 22 7.8 1.8 7.6 Fish, Snail Eichornia Protozoan Algae

March 13 20 8.1 2.0 7.7 Fish, snail Hydrilla, Eichornia Protozoan, Copepod –

April 11 23 8.4 2.2 7.4 Fish, Chironomous larvae, Snail

– Protozoan, Cladoceran

–

May 9 25 8.6 2.4 7.2 Fish, Snail – Protozoan, Cladoceran

–

June 10 27 8.5 2.6 7.3 Fish, Frog, snail, Chironomous larvae

– Protozoan, Copepod, Cladoceran

Algae

July 12 28 8.4 2.5 7.4 Snail Eichornia, Hydrilla – Algae

August 10 25 8.3 2.6 7.6 Snail Eichornia – Algae

September 13 23 8.2 2.7 7.4 Fish, Frog, snail Eichornia Copepod Algae

October 15 20 8.1 2.2 7.8 Fish, snail Eichornia, Protozoan Algae

November 13 19 7.7 1.7 7.5 Snails – Protozoan Algae

December 14 16 8.0 2.1 7.8 Snails – – Algae

Table 27 : Physico-chemical and Biological Analysis of water samples at Gularghati (L-5) Locality of Doon Valley during January, 2003 to December, 2003


(cm) Temp. (00C)

pH Free CO2

(mg/l)


January 14 19 8.1 4.6 6.1 Fish, Snail Eichornia, Lemna – –

February 12 21 8.0 4.4 5.8 Fish, Snail, Crab Eichornia, Lemna – Algae

March 15 23 8.2 4.6 6.0 Fish, snail Eichornia, Lemna Protozoan Algae

April 10 24 7.5 4.7 6.0 Fish. snail, Chironomous larvae

Eichornia Protozoan, Copepod Algae

May 8 26 8.5 5.0 5.8 Fish. snail, Chironomous larvae

Eichornia Protozoan, Copepod –

June 11 27 8.0 5.1 5.7 Snail, Chironomous larvae, Crab

Eichornia Protozoan, Copepod, Rotifer

–

July 10 27 7.8 4.9 5.8 Chironomous, frog, snal

Eichornia, Marsilia – –

August 10 26 7.6 4.7 6.2 Frog, Chironomous larvae, Crab

Eichornia – Algae

September 12 25 7.6 4.5 6.0 Snail, Chironomous larvae, Crab

Eichornia Protozoan, Copepod Algae, Diatoms

October 13 23 8.0 4.5 6.1 Fish, snail Eichornia, Protozoan, Copepod Algae

November 13 21 8.0 4.3 5.6 Fish, Snails Eichornia Protozoan, Cladoceran

Algae

December 15 18 8.2 4.5 6.2 Snails – – –

Table 33 : Combined larval-pupal density / dip in experimental / control tanks before implementation of small scale field

trials during May-June (Pre-monsoon) 2005. Experimental days Tank (T1)

(with L. (P.) acuminata)

Tank (T2) (with Thiara tuberculata)

Tank (T3) (with B.

bengalensis)

Tank (T4) (Control)

Average density / dip

1st day 6.8 5.6 7.8 7.2 6.73

3rd day 7.1 7.3 8.2 6.9 7.53

5th day 6.3 7.9 7.2 6.3 7.13

7th day 6.5 6.0 7.3 5.8 6.60

10th day 6.8 6.5 7.2 6.8 6.83 Table 34 : Combined larval-pupal density / dip in experimental / control tanks before implementation of small scale field

trials during September-October (Post-monsoon) 2005. Experimental days Tank (T1)

(with L. (P.) acuminata)

Tank (T2) (with Thiara tuberculata)

Tank (T3) (with B.

bengalensis)

Tank (T4) (Control)

Average density / dip

1st day 7.5 7.2 8.0 7.8 7.56

3rd day 8.0 7.8 8.5 8.1 8.10

5th day 7.8 6.9 7.2 7.5 7.30

7th day 8.1 6.5 8.3 6.7 7.63

10th day 7.0 7.4 7.8 8.0 7.40

Table 35 : Combined larval-pupal density / dip in experimental / control tanks after release of selected species of snails

during May-June (Pre-monsoon) 2005.

Larval-Pupal density/ dip In Exp. Tanks after introducing snail’s species Experiment

No. Days No. of snails released in

each exp. tank

No. of mosq. larvae released

in each exp. tank

T-I Lymnaea (P.)

acuminata

T-II Thiara (M.) tuberculata

T-III Bellamya

bengalensis

In Control Tank (T-IV)

0 5 50 – – – –

1 – – 7.0 6.5 5.7 7.5 Exp. – I

2 – – 6.7 6.2 5.4 7.1

0 5 50 – – – –

1 – – 6.5 5.9 4.8 6.8 Exp. – II

2 – – 6.1 5.5 4.3 6.5

0 5 50 – – – –

1 – – 5.7 4.8 4.0 6.2 Exp. – III

2 – – 5.6 4.3 3.7 5.9

0 5 50 – – – –

1 – – 6.3 5.3 4.5 6.3 Exp. – IV

2 – – 5.9 5.0 4.2 6.0

Average / dip – – – 6.22 5.43 4.57 6.53

Table 36 : Combined larval-pupal density / dip in experimental / control tanks after release of selected species of snails during September-October (Post-monsoon) 2005.

Larval-Pupal density/ dip

In Exp. Tanks after introducing snail’s species Experiment No. Days

No. of snails released in

each exp. tank

No. of mosq. larvae released

in each exp. tank

T-I Lymnaea (P.)

acuminata

T-II Thiara (M.) tuberculata

T-III Bellamya

bengalensis

In Control Tank (T-IV)

0 5 50 – – – –

1 – – 7.7 6.9 6.3 8.1 Exp. – I

2 – – 7.5 6.7 5.9 7.8

0 5 50 – – – –

1 – – 7.2 6.3 5.6 7.6 Exp. – II

2 – – 6.9 6.1 5.2 8.0

0 5 50 – – – –

1 – – 6.2 5.9 5.8 7.2 Exp. – III

2 – – 5.9 5.5 4.5 6.9

0 5 50 – – – –

1 – – 6.8 6.0 5.3 8.1 Exp. – IV

2 – – 6.5 5.9 5.0 7.3

Average / dip – – – 6.83 6.16 5.32 7.62

Table 32 : Pupation of Anopheles stephensi in association with snails species in two different media Exp. No. Media

Ist Exp. No. pupated present

IInd Exp. No. pupated present

IIIrd Exp. No. pupated

present Mortality obtained in Experiment No. Total Percent

1 48 49 48 2 1 2 5 3.3 2 47 49 46 3 1 4 8 5.33 3 44 45 45 6 5 5 16 10.6 4 43 42 43 7 8 7 22 17.3 5 42 40 42 8 10 8 8 26 6

Snail’s water

40 35 38 10 15 12 37 24.6

1 46 47 45 4 3 5 12 8.0 2 38 43 40 5 7 5 17 11.3 3 44 41 46 6 9 4 19 12.6 4 45 52 40 5 8 10 23 15.3 5 40 38 42 10 12 8 30 20.0 6

Tap water

35 32 40 15 18 10 43 28.6

(1) Indoplanorbis exustus (Deshayes, 1884) (4) Thiara (M.) tuberculata (Mueller, 1774) (2) Lymnaea sp. (5) Bellamya bengalensis f. typica (Lamarck, 1882) (3) Lymnaea (P.) acuminata f. chlamys (Benson, 1836) (6) Nil

table 3(a) : population fluctuation (size distribution) of...

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