Transcript
Page 1: sea ranching in the Philippines

Marine Science Institute, University of the Philippines

Page 2: sea ranching in the Philippines

• High species richness (40 species) and diversity (H=2.67)

• Low population densities (0.3 to 9 ind.ha-1)

- Holothuria scabra (5.2 ind.ha-1)

• Majority immature

Status of sea cucumber fishery resource Bolinao, Philippines

(Olavides et al., in press)

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Source: 16 respondents trepang fishers for >30 years

Holothuria scabra “sandfish”

(Olavides et al., in press)

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Rights holders : exclusive harvest rights for sea cucumber in 5-hectare area

and exclusive access - Zone A and Zone B Other local community members : access -Zone C

3

A 1

2

B

C

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C. Monitoring Scheme

3

A 6 transects (30m x 2m)

1

2

8 transects (100m x 2m)

8 transects (100m x 2m)

B

C

POPULATION PARAMETERS:

• Growth In pens (single batch) Entire sea ranch( multiple batches) - average weight over time

- modal progression of length converted to weight frequency distributions ( FISATII 2000)

• Survival rate (%Sur) %Sur = Abtot / RHtot where Abtot = total Ab in sea ranch

RHtot = total # released juveniles

• Population density (Dz) in individuals per square meter Dz = nz / az

where nz = number of samples in a zone az = total area (m2) surveyed in a zone

• Estimated Abundance (Abtot) in number of individuals

Abz = Dz * Az

where Dz= population density

Az = total area (m2) of zone

Abtot = sum of Abz

• Biomass (kg ha-1) Btot = (sum of Abc * Wc /5)/1000 where Abc -number of individuals per size class

Wc - mid weight of size class (g)

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Signing of partnership agreement: December 6, 2007

Total juvenile released: 24,175

Year 1 = 5,011 (Dec 2007-June2008)

Year 2 = 11,106 (Sept 2008 – Apr 2009) Year 3 = 9,313 (Jan-Jul,2010)

Year 4 = 600 (Nov, 2010)

No. of monitoring surveys conducted: 11

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Signing of partnership agreement: February 5, 2009

Total juvenile released: 20, 548

Year 1 = 5,613 (Dec 2008 – Apr 2009)

Year 2 = 14,935 (July 2009-Apr 2010) Year 3 = 4,723 (Nov-Dec, 2010)

No. of monitoring surveys conducted: 7

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Signing of partnership agreement: May 13, 2009

Total juvenile released: 22,472

Year 1 = 3,275 (May 2009 )

Year 2 = 19,197 (Jun 2009-Apr 2010) No. of monitoring surveys conducted: 6

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M6

M5

M4

M3

M2

M1

Typhoon Emong After

Emong

RELEASES (n)

1052

1248

823

1389

723

1621

1857

4779

1460

1st Harvest (n=127; 40 kg)

2nd Harvest (n=33) Size class (grams)

No.

of

indiv

iduals

Release

Monitoring

M6

M5

M4

M3

M2

M1

After EMONG

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No.

of

indiv

iduals

Size class (grams)

M7

M6

M9

M8

M10

M11

Mass spawning

RELEASES (n)

600

1958

1150

4350

1255

Mass Harvest (n=1,563; 224kg)

Releases

Monitoring

M7

M6

M9

M8

M10

M11

Estimated density for the sea

ranching site = 1,800 ind ha-2

Typhoon Ondoy & Pepeng

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(Olavides et al., 2011)

19.7% (38 out of 181) adults observed

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2,300 3,846 8,713 6,856 16,447

329 2953 3042 3089 1696 5748

- Total released animals

- Estimated Abundance

Survival

April 2008 July 2008 January 2009 Oct 2008 April 2009 July 2009

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Demonstration Site

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University of the Philippines Marine Science Institute

Australian Center for International Agriculture

Research

Department of Science and Technology

Maraming

Salamat!

Adopted from Battaglene, 1999


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