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Seasonal growth, stock-recruitment relationship and predictive yield of the Indian squid Loligo duvauceli (Orbigny) exploited off Karnataka coast

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Relation http://eprints.cmfri.org.in/218/
 
Title Seasonal growth, stock-recruitment relationship
and predictive yield of the Indian squid Loligo
duvauceli (Orbigny) exploited off Karnataka coast
 
Creator Mohamed, K S
Rao, G Syda
 
Subject Cephalopods
 
Description A seasonally oscillating version of the von Bertalanffy growth function was
fitted to explain growth in the Indian squid Loligo duvauceli (Orbigny)
exploited from the Arabian Sea off Karnataka State. The parameters estimated
were L_ = 371 mm; K=1.4 yr'; C=0.5 and WP=0.56, considering that the AT
(5°C) in annual mean seawater temperature is sufficient to induce small but
significant oscillations in the growth pattern. A retrospective analysis of the
data on squid fishery for 1983-'95 was done using length-structured virtual
population analysis (VPA) and this indicated that the mean number of
survivors was on an average 10 times more than the numbers caught. Further,
nearly 6 % of the stock died due to natural causes annually, Ricker's stockrecruitment
curve could adequately (R^=0.45) explain the variation in
recruitment with respect to spawning stock biomass (SSB). The study indicated
that squid SSB is a reasonably good predictor of its recruitment. Predictive
yields were assessed using the Thompson and Bell model and it indicated an
MSY level of 6,059 t and MSE of Rs. 270.3 million, while the present average
catch (1990-'94) amounted to 5,157 t valued at Rs. 234.9 million. The MSY and
MSE can be attained by reducing trawl effort to 44 % of the present effort.
 
Publisher CMFRI/ICAR
 
Date 1997
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/218/1/Article_03.pdf
Mohamed, K S and Rao, G Syda (1997) Seasonal growth, stock-recruitment relationship and predictive yield of the Indian squid Loligo duvauceli (Orbigny) exploited off Karnataka coast. Indian Journal of Fisheries, 44 (4). pp. 319-329.