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Fishery, Growth, Mortality Rates and Stock Assessment of Auxis thazard (Lacepede) Along Tuticorin Coast, Gulf of Mannar

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Title Fishery, Growth, Mortality Rates and Stock Assessment of Auxis thazard (Lacepede) Along Tuticorin Coast, Gulf of Mannar
 
Creator Mohamad Kasim, H
 
Subject Stock Assessment
Tuna fisheries
Population Dynamics
 
Description Paruvalai. a drift gillnet with mesh size ranging from 90 to 170 mm exploits the tuna resource more effectively (98%)
than the podivalai, another type of drift gillnet with mesh size 40-70 mm, and hooks and lines. Among the seven species.
Auxis thazard (Lacepede) was the second dominant species next to Euthyiznus affinis (Cantor) forming 40.2% of the total
tuna production by paruvalai. The Lα and K are estimated to be 49 cm and I .3/yr, respectively for males and 51.2 cm
and 1.3/yr, respectively for females of A. tllazard. The natural mortality rate (M) is estimated to be 1.85 for males and
1.82 for females. The total mortality coefficient (Z) is estimated to vary from 4.88 in 1992-93 to 7.07 in 1993-94 with an
average of 5.55 for males and from 3.53 in 1995-96 to 5.94 in 1992-93 with an average of 4.85 for females. The fishing
mortality rate (F) ranged from 3.03 in 1992-93 to 5.22 in 1993-94 with an average of 3.70 for males and from 1.71
in 1995-96 to 4.12 in 1992-93 with an average of 3.03 for females. The exploitation rate (U) ranged from 0.62 in 1992-
93 to 0.74 in 1993-94 with an average of 0.66 for males and from 0.47 in 1995-96 to 0.69 in 1992-93 with an average of
0.62 for females. Average annual yield of A. thazard is estimated to be 288 t during 1992-97 and the average annual stock
(P) is estimated to be 429.9
 
Date 2000
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/4551/1/8.pdf
Mohamad Kasim, H (2000) Fishery, Growth, Mortality Rates and Stock Assessment of Auxis thazard (Lacepede) Along Tuticorin Coast, Gulf of Mannar. In: The Fifth Indian Fisheries Forum Proceedings, 17-20 January, 2000, Bhubaneswar, Orissa.