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Age and growth, mortality and stock assessment of Euthynnus affinis (Cantor) from Maharashtra waters

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Relation http://eprints.cmfri.org.in/156/
 
Title Age and growth, mortality and stock assessment
of Euthynnus affinis (Cantor) from Maharashtra
waters
 
Creator Khan, Mohammad Zafar
 
Subject Tunas
Stock Assessment
 
Description Kawakawa, Euthynnus affinis contributed on an average 1,563 t to the annual
fish landings during 1996-2000 in Maharashtra. The drift net is the major
gear, which exploits tuna resource. The species form about 87 % of the tuna
landings by drift net at Sassoon dock (Mumbai). The other species were Thunnus
tonggol, Auxis thazard and A. rochei, which together constituted about 13.0 %
of the drift gill net catch. The size range of E. affinis in the drift net was from 26 to 73 cm. The growth parameters estimated are L ∝= 81.7 cm and K = 0.79
(annual). The total mortality coefficient (Z) varied between 2.04 and 2.88 dur-
ing 1996-2000 with an average of 2.24 during the last 3 years with exploita-
tion ratio (F/Z) of 0.6. The natural mortality coefficient (M) has been estimated
as 0.928. The biomass is 1,344 t off Maharashtra, while the present average
yield is 1,722 t. The maximum sustainable yield (MSY) has been estimated as
1,725t for Maharashtra indicating that the present exploitation is close to MSY.
 
Publisher CMFRI
 
Date 2004
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/156/1/IJF_51_no.2_%2C2004_-_12_Mohamed.pdf
Khan, Mohammad Zafar (2004) Age and growth, mortality and stock assessment of Euthynnus affinis (Cantor) from Maharashtra waters. Indian Journal of Fisheries, 51 (2). pp. 209-213.