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Stock assessment and management options for whelks along south-eastern Arabian Sea

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Title Stock assessment and management options for whelks along
south-eastern Arabian Sea
Not Available
 
Creator Mohan,Anjana
Kripa,V
Mohamed,K S
 
Subject Babylonia spirata
Babylonia zeylanica
Buccinidae
Population dynamics
Whelk fishery
gastropods
Baigai
 
Description Not Available
Two species of whelks viz., Babylonia spirata and Babylonia zeylanica belonging to the family Buccinidae are commercially
fished from Kollam, south-west coast of India, since early 1990’s and are exported from India under the trade name ‘Baigai’.
The species is present all through the year in the fishing grounds, caught as by-catch in shrimp trawlers and is a targeted
fishery from April to June, when more than 50% of the annual whelk catch is taken. B. zeylanica dominates the whelk catch
(61% of the annual catch). The average catch rate in the modified trawlers for whelk was 400 kg unit-1 day-1. Following the
von Bertalanffy growth function, asymptotic length and growth rate were estimated as 68.7 mm and 1.08 respectively for
B. spirata and as 76 mm and 1.15 respectively for B. zeylanica. The L50 estimated for B. spirata and B. zeylanica were
35.2 and 41.7 mm respectively. The optimum length of capture and mean generation time were 40 mm and 0.55 years for
B. spirata and 44 mm and 0.48 years for B. zeylanica respectively. The annual mean length of B. spirata showed an increase
from 37.4 mm in 2001 to 40.1 mm in 2002 and multiple cohorts have been observed. The relative yield-per-recruit analysis
shows that, present rate of exploitation of B. spirata has reached the optimum and that of B. zeylanica has nearly attained the
optimum. The faster growth rate, early maturity and continuous breeding behaviour explain the sustained fishery of
B. spirata and B. zeylanica under a high fishing pressure along Kollam coast.
Not Available
 
Date 2021-09-16T06:56:48Z
2021-09-16T06:56:48Z
2012
 
Type Article
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/63050
 
Language English
 
Relation Not Available