Population dynamics of Indian mackerel Based on data from Mangalore during 1967-1975

Yohannan, T M (1982) Population dynamics of Indian mackerel Based on data from Mangalore during 1967-1975. Indian Journal of Fisheries, 29 (1&2). pp. 50-62.

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Abstract

The total mortality rate (Z), as on data collected at Mangalore during 1967-75, ranged between 2.54 and 6.21. Since the total mortality had no regression on Ashing intensity the natural mortality rate (M) was calculated as 1.5 from the effective life span of mackerel. K,t„ and WQ, values were estimated based on the growth in weight. The studies indicated that mackerel can withstand heavy fishing mortalities (F) and the value of F that gives the maximum yield is 6.00. The recommended age at entry into the exploited phase ( t . ) is 8 months instead of the present 6 months. Increasing the F value to 6.00 and tp. to 8 months it is found that the existing quantity of the average standing stock can give an average annual catch of 1,98,870 tonnes instead of the present 96,451 tonnes.

Item Type:Article
Uncontrolled Keywords:Population dynamics; Indian mackerel; Mangalore
Subjects:Pelagic Fisheries > Mackerel fishery
Marine Fisheries > Population Dynamics
Divisions:CMFRI-Cochin > Marine Capture > Fishery Resource Assessment
CMFRI-Cochin > Marine Capture > Pelagic Fisheries
ID Code:511
Deposited By:Dr. V Mohan
Deposited On:12 May 2010 15:14
Last Modified:12 May 2010 15:14

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