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Reproductive biology, trophodynamics and stock structure of ribbonfish Trichiurus lepturus from northern Arabian Sea and northern Bay of Bengal

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Title Reproductive biology, trophodynamics and stock structure of ribbonfish Trichiurus lepturus from northern Arabian Sea and northern Bay of Bengal
 
Creator Ghosh, S
Rao, M V Hanumantha
Rohit, P
Rammohan, K
Maheswarudu, G
 
Subject Ribbonfish
Population dynamics
Spawning
Food and feeding
India
 
Description 755-771
Reproductive biology,
trophodynamics and stock structure of ribbonfish Trichiurus lepturus landed
by trawlers along northern Arabian Sea and northern Bay of
Bengal was studied during 2007 – 2010. Average annual catch along
northern Arabian Sea and northern Bay of Bengal
was 42649 t and 31944 t. Mean length was significantly higher in the former
region. Growth in adults from northern Bay of Bengal was allometric and from
northern Arabian Sea was isometric and growth
rate in both the regions was significantly different within sexes and between
sexes and indeterminates. Length weight relation for males and indeterminates
were significantly different between both the regions. Overall sex ratio was
1.33 in northern Arabian Sea and 1.22 in northern Bay of
Bengal. Length at first maturity was 61.2 cm in the former region
and 52.9 cm in the latter region. Peak spawning season was December – March
with more mature females

encountered in Northern Arabian Sea. Total fecundity ranged between
23756 and 208300 along northern Arabian Sea and 21672 and 156695 along northern
Bay of Bengal. The mature ovaries from both
the regions contained maturing (0.6 mm – 0.7 mm) and mature ova (1.2 mm – 1.3
mm). Fin fishes dominated by clupeids, sciaenids, carangids and scombrids were
the most preferred prey, followed by prawns and cephalopods. Feeding intensity
was more in northern Arabian Sea than northern Bay of
Bengal. Juveniles fed mostly on prawns and cephalopods while
adults preferred finfishes. Fishes with empty stomachs were encountered in high
numbers in both the regions. Feeding intensity was higher in older fishes in
northern Bay of Bengal and in juveniles and very large fishes in northern Arabian Sea. The von Bertalanffy growth

equation along northern
Arabian Sea was Lt = 131.6 [1 – e - 0.15 (t + 0.0740)] and along
northern Bay of Bengal was Lt  = 114.4 [1 – e - 0.28 (t + 0.0564)]. Along
northern Bay of Bengal, reduction in fishing mortality from 0.81 to 0.73 – 0.76
will help in rationally exploiting the stock but along northern Arabian Sea, fishing mortality is below optimum and has

to be increased from
0.18 to 0.34 for optimally exploiting the resource.
 
Date 2016-06-23T11:30:47Z
2016-06-23T11:30:47Z
2014-05
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/28762
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(5) [May 2014]