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Study on preferred food items of hilsa (Tenualosa ilisha).

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Title Study on preferred food items of hilsa (Tenualosa ilisha).
Not Available
 
Creator De D.
PS. Shyne Anand
Sinha S.
Suresh V.R.
 
Subject Tenualosailisha
gut analysis
preferred food
diatom
copepod
 
Description Not Available
The Indian shad hilsa (Tenualosailisha) is one of the most important
tropical fish of the Indo-Pacific region. There is a compelling need for
domestication and culture of the species for conservation and
rehabilitation of its declining fishery and information on the food and
feeding habits of the species is essential for its domestication. For this
purpose a study on gut content analysis of T. ilisha of different size
groups were carried out to know the preferred food items of the species
in Hooghly estuarine stretch in West Bengal. Fish specimens of
different size groups were collected from different habitats viz., marine
(Namkhana and Fresser Gunge), brackishwater (Kakdwip Lot.8 and
Nischintapur) and freshwater (Godakhali, Sultanpur and Diamond
Harbour) habitat in West Bengal. The specimens were dissected and
gut contents were analyzed by frequency of occurrence of food items
and volumetric analysis method. Fishes (n=90) were divided into 9
different size groups as per their body weight i.e. 1-5 g, 5-10 g, 10-30
g, 30-50 g, 50-100 g, 100-200 g, 200-400 g, 400-600 g and 600-800 g.
Frequency of occurrence of gut contents (%) of fishes below 10 g size
indicated that diatoms were the major items in the gut with
Coscinodiscussp. andBiddulphiasp. asdominant among diatoms. In 10-
30 g size group, copepods, diatoms and filamentous algae were the
major items in the gut and Coscinodiscussp. was dominant among
diatoms. In 30-50 and 50-100 g size group, diatoms followed by
copepods formed the major food items. Coscinodiscussp. and
Nitzschiasp. were dominant in 30-50 g group whereas Biddulphiasp.
and Pleurosigmasp. were dominant in 50-100 g group. In fishes of
above 100g diatoms formed the major food items followed by
copepods. Among the diatoms, Coscinodiscussp. And Biddulphiasp.
Debasis De et al

648
were dominant in 100-200 g and 200-400 g group. Coscinodiscussp.,
Nitzschiasp. and Asterionellasp. were dominant in 400-600 g group
whereas Coscinodiscussp. andThalassiothrixsp. were dominant in 600-
800 g group. Majority of items in the gut were in digested state. Sand
particles (4.17 to 37.50% of total gut volume) observed in the guts of
majority of the specimens, may be attributed to turbid habitat from
where animals were caught. Volumetric index analysis (%) of gut
samples indicated that digested food occupied highest volume in 1-5 g
size groups.Copepod occupied more volume than diatom in fishes of 5
to 50 g body weight range,whereasdiatoms occupied maximum volume
in fishes weighing more than 50g. The study indicated that hilsa
(Tenualosailisha) prefer copepod in their early stages and shift their
preference towards diatom when they grew beyond 50 g size.
Not Available
 
Date 2018-12-17T11:17:22Z
2018-12-17T11:17:22Z
2013-01
 
Type Research Paper
 
Identifier De D., Shyne Anand P.S., Sinha S., and Suresh V.R. 2013. Study on preferred food items of hilsa (Tenualosa ilisha). International Journal of Agriculture and Food Science Technology. 4(7): 647-658.
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/16055
 
Language English
 
Relation Not Available;
 
Publisher Research India Publications