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Fishery, growth, yield per recruit and stock assessment of Sphyraena obtusata Cuvier off Tuticorin, Gulf of Mannar

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Relation http://eprints.cmfri.org.in/299/
 
Title Fishery, growth, yield per recruit and stock assessment
of Sphyraena obtusata Cuvier off Tuticorin, Gulf of
Mannar
 
Creator Mohamad Kasim, H
Balasubramanian, T S
 
Subject Stock Assessment
 
Description Annual average catch of 612.2 t of barracudas were landed at the catch rate of 17.1 kg/unit which constituted
3.9% in the total catch landed by trawlers during 1987 - '89 at Tuticorin. Higher effort input during
certain months did not coincide with better abundance of barracudas. Sphyraena obtusata Cuvier
constituted on an average 69.6% of the total catch of barracudas. Based on the length-frequency data,
the growth {^ameters have been estimated to be L 470.0 mm, K 1.0364/year and t^ -0.0098 ye. The
natural mortality coefficient (M) is 1.591, the average annual total mortality coefficient (Z) is 2.8317 and
the average exploitation rate (U) is 0.4123. The average standing stock is estimated to be 343.2 t and
average annual stock 1,032.71. Yield per recruit studies indicate that S. obtusata is not exposed to higher
fishing pressure as the average fishing mortality coefficient (F), 1.2407, for the prevailing age at first
capture, 0.4709 ye is lower than the respective F,^which can yield the Y,^ in both the M/K ratios 1.0
and 1.535. There is scope for increasing the effort of trawl net with a view to increase the catch of this
species at the prevailing conditions.
 
Publisher CMFRI/ICAR
 
Date 1990
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/299/2/Article_04.pdf
Mohamad Kasim, H and Balasubramanian, T S (1990) Fishery, growth, yield per recruit and stock assessment of Sphyraena obtusata Cuvier off Tuticorin, Gulf of Mannar. Indian Journal of Fisheries, 37 (4). pp. 281-288.