lesser sardines
TRANSCRIPT
LESSER SARDINES
, ANJU.P
S.I.F CUSAT
LESSER SARDINE COMES UNDER 2 FAMILIES
1. Family: clupeidae
2.Family: dussumieridae
MORPHOLOGY
.
.
body is elongate and laterally compressed having a row of scutes
along the ventral edge. Lateral lines is absent and the scales are deciduous. elongate body which is rounded
and not laterally compressed. Abdomen is not keeled and ventral edge of the body is with out scutes.
Family : clupiedae [9 sps.]
.Sardinella jussieu chalamathi , tembang
Sardinella fimbriata fringe scale sartdine
Sardinella albella kowala albella
Sardinella sirm trenched sardine, kareemeen chala
Sardinella clupeoids amblygaster
Sardinella melanura clupia melanura
Sardinella sindensis clupia sindensis
Kowala coval white sardine
Family: dussumieridae [2 sps.].Dussumieria acuta common spart
Dussumieria hasseltii rainbow sardine
distribution.
..Family : clupeidae Family : dusumeiridae
They are seen in the inshore waters along both EW coast regions, further north of cape Comorian, along the entire east coast of India, east coast of Africa, Madagascar, Arabia, Malayan archipelago. Australia, Polynesia, Philippines, china, Sri Lanka, red sea, Pakistan.. etc
coastal along Arabia, India, Sri Lanka , Malayan archipelago and Philippines ..etc.
FOOD AND FEEDING
‘
.Lesser sardines are essentially plankton feeders , with preference for zooplanktonic organisms. But
some include ,amounts of phytoplankton also as diatoms and
filamentous algae in their diet.
SIZE AT FIRST MATURITY
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..FAMILY clupeidae Dussumierida
e
size at first maturity
12-15 Cm 13-15cm
max. length 25cm 18cm
SHOALING.
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Lesser sardines are shoaling fishes, larger shoals striking the costal waters seasonally
result in quite good catch. This shoaling behavior is advantageous in
escape from predators, provide more opportunity for food , and also decrease
the energy.
REPRODUCTION
.
.
In lesser sardines the sexual maturity is attained in most of the species is in 1 year. Eggs are pelagic with segmented yolk and with a single clear oil globule. Usually females are bigger than males.
SPAWNING SEASON
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.In lesser sardine , spawning of an individual fish is a shorter duration comparing to the species as a whole. On east coast spawning
happens between feb. and lasts till June and peak at Feb. - April. In gulf of manna region Dec -march. In Tuticorin bay it is Oct-Nov. Malabar coast it is April- June. West coast march April to June in pre
monsoon period. According to the region , availability of food, and species the time
varies
FECUNDITY.
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It has been observed to be 10000 to 13000 eggs a female can produce [ fish
of 14.6 to 15.5 cm in length]. The gonads are asymmetrical lobes in clupeidae the left lobe larger than right one. In dussumieridae the right one is
larger than left one.
SEX RATIO
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.Females are observed to be twice the number of males in the commercial
catch, so it is presumed that the mature females migrate to the off
shore waters for breeding
Life history
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.Egg is 1.1-1.56 mm in diameter with an oil globule. Spawning at about 4.00am and it hatch 2 pm. Just hatched larvae is about 2.3-2.6 mm
in length . The eyes, otocyst , heart and the full
compliment of myotomes are formed in the embryo . Pigmentation is also developed in the
numerous small dark chromatophores. Species differ in having different number of pre
anal and post anal myotomes . In 2 or 3 days whole yolk is absorbed.
.Auditory vesicle and vent are well developed and unpaired fin folds had scattered pigment
spots.Juveniles are distinguished by the number of post ventral scutés about 1 year the attain
maturity.
CRAFT AND GEAR
.
..STATE KERALA TAMIL NADU KARNATAKA
WEST BANGAL A.P
GEAR gill net – chalai valashore seine – kara valboat seine – kolli valacast net- veesu vala
gill net – choodai valaShore seine Boat seine –Madi valai Cast valai – veechu valai
Gill net Shore seineDrift net Cast net
Drift netsChhandi- jalShore seine – ber jal
Gill net –kili valaShore seine- pedda valaBoat seine – iragru vala
.In Gujarat bag net is used .Boat seines and gill nets are
commonly used gill nets are of 2 types they are 1. Chooda valai
2. Mathi chala valaiWhen at the peak season catch
is large boat seine - paithu vala is used
BOATS
masula boat Pablo boat catamaran
Dug out canoes ran pani boat
mechanised boat [ A.P, T.N,KERALA, KARNATAKA]
FISHERIES.
.
Contribution of lesser sardine in all india marine landing – 2.9-7.3%
Average annual yield during the landing ~= 7800tIf we analyse a data from 1986-2000 we can see
landing Is low with 68267t in 1986 Production high at 1995 – 128000 t
East coast -65%West coast- 35%
Tamil nadu ranked first -43%Followed by kerala – 22%Andhra Pradesh – 17%
.
Karnataka – 6%Along the coastal states of west bangal , orissa and AP.. On the east coast the peak season is
nov-aprl- may.While in the south east coast of TN, pondicherry
.. Catches are available almost throghout the year
west coast in kerala the catches – aug – jan/ febIn karnataka better landing seen in- sep -nov
.
peak catch – sep- feb along the goa coast. Maharashtra coast – dec- april
More than one species contribute to the lesser sardine fishery through out the year
Goa ,karnataka coast – s. gibbosa s . dayi
s . fimbriata s. albella
Kerala coast – s. gibbosa s. Sindensis
s. sirm
.
Pak bay and gulf of manna – s.albella s. gibbosa Between vizhinjam and tuticorin – s.sirm
Central coast . All most all species are equally caught.
OTHER factors
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.The Dorab, seer fishes, lactarius and some of the sciaenid's are predate them .
Copepod parasite of the genera NOTHOBOMOLOCHUS , CLAVELLISA AND
PSUEUDOPETALUS are known to be parasitic on Dussumeiri hasseltii in the gill arches, branchial cavity and buccal cavity.
Thank you.