POPULATION DYNAMICS OF INDIAN MACKEREL BASED ON DATA PROM MANGALORE DURING 1967-1975
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Authors
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T M Yohannan
Research Centre of Central Marine Fisheries Research Institute, Calicut
Abstract
The total mortality rate (Z), as on data collected at Mangaloreduring 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.
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The copyright of the articles published in Indian Journal of Fisheries vests with the Indian Council of Agricultural Research, who has the right to enter into any agreement with any organization in India or abroad engaged in reprography, photocopying, storage and dissemination of information contained in these journals. The Council has no objection in using the material, provided the information is being utilized for academic purpose but not for commercial use. Due credit line should be given to the ICAR where information will be utilized.How to Cite
Yohannan, T. M. (2011). POPULATION DYNAMICS OF INDIAN MACKEREL BASED ON DATA PROM MANGALORE DURING 1967-1975. Indian Journal of Fisheries, 29(1 & 2), 50-62. https://epubs.icar.org.in/index.php/IJF/article/view/11883
