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<span style="mso-ansi-language:EN;mso-fareast-language: EN-IN" lang="EN">Reproductive biology and population characteristics of <i>Sardinella gibbosa</i> and <i>Sardinella fimbriata</i> from north west Bay of Bengal </span>

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Title Reproductive biology and population characteristics of Sardinella gibbosa and Sardinella fimbriata from north west Bay of Bengal
 
Creator Ghosh, S
Rao, M V Hanumantha
Sumithrudu, S
Rohit, P
Maheswarudu, G
 
Subject Lesser sardines
Population dynamics
Spawning
Gill netters
Bay of Bengal
 
Description 758-769
Reproductive biology and population characteristics of Sardinella
gibbosa and Sardinella fimbriata landed by gill netters from
north west Bay of Bengal was studied during 2005 – 2010. Average annual catch
was 21080 t, in which the contribution of S. gibbosa was 12790 t
and the contribution of S. fimbriata was 8290 t. SST, rainfall
and chlorophyll a were found to affect the annual catch of lesser sardines.
Length weight relation showed differential growth between adults and
indeterminates for both the species. Overall sex ratio varied between 1:1.28 to
1:1.33 for S. gibbosa and between 1:1.02 to 1:1.025 for S.
fimbriata with length at first maturity of 13.03 cm for S.
gibbosa and 13.27 cm for S. fimbriata. Peak spawning season
was February – April for S. gibbosa and May - July for S.
fimbriata. Total fecundity ranged between 12786 ova to 68377 ova for S.
gibbosa and between 11066 ova to 60981 ova for S. fimbriata.
Mature ovaries in lesser sardines contained both immature and mature ova. Von
Bertalanffy growth equation was Lt = 20.7 [1 – e - 0.96
(t + 0.018)] for S. gibbosa and Lt = 20.7 [1 – e
- 0.85 (t + 0.023)] for S. fimbriata.
Natural mortality, fishing mortality, total mortality and exploitation rate
were 1.90, 3.56, 5.46 and 0.65 for S. gibbosa and 1.75, 2.57,
4.32 and 0.59 for S. fimbriata, respectively. A higher value of E
than E0.5 for both Sardinella gibbosa and Sardinella
fimbriata and a lower value of Maximum Sustainable Yield than annual
average catch indicate intensive fishing of lesser sardines along north west
Bay of Bengal.
 
Date 2013-12-13T12:46:06Z
2013-12-13T12:46:06Z
2013-10
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/24812
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.42(6) [October 2013]