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

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.

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Abstract

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.

Item Type:Article
Uncontrolled Keywords:Fishery; stock assessment; Sphyraena obtusata; Tuticorin; Gulf of Mannar
Subjects:Marine Fisheries > Stock Assesment
Divisions:CMFRI-Cochin > Marine Capture > Fishery Resource Assessment
ID Code:299
Deposited By:Dr. V Mohan
Deposited On:29 Mar 2010 15:40
Last Modified:01 Jan 2011 15:47

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