Investigations on the age, growth and mortality parameters of Kawakawa, Euthynnus affinis (Cantor, 1849) from the North west coast of India

Vinod Kumar Mudumala; Mahesh Kumar Farejiya; Kiran S. Mali; Karri Rama Rao; Pradnya Sawant Ankush; Siva Anandhan

doi:10.22034/ijab.v6i1.394

Authors

Vinod Kumar Mudumala
[email protected]
Fishery Survey of India, Facility Research Centre, Plot 2A, Unit no. 12, Sassoon Dock, Colaba, Mumbai - 400005, India.
Mahesh Kumar Farejiya Fishery Survey of India, Facility Research Centre, Plot 2A, Unit no. 12, Sassoon Dock, Colaba, Mumbai – 400005, India.
Kiran S. Mali Fishery Survey of India, Facility Research Centre, Plot 2A, Unit no. 12, Sassoon Dock, Colaba, Mumbai – 400005,
Karri Rama Rao Dept. of Zoology, Govt. Degree and PG College, Jammikunta, Karimnagar Dt. Telangana State, India.
Pradnya Sawant Ankush Fishery Survey of India, Facility Research Centre, Plot 2A, Unit no. 12, Sassoon Dock, Colaba, Mumbai – 400005, India.
Siva Anandhan Fishery Survey of India, Facility Research Centre, Plot 2A, Unit no. 12, Sassoon Dock, Colaba, Mumbai – 400005, India.

Vol. 6 No. 1 (2018): February

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February 25, 2018

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Kawakawa, Euthynnus affinis contributes to the tune of 35,466 tonnes forming 1% to the total marine fish landings of India. Investigations on growth and mortality were of this species carried out based on the length frequency data during 2008-2012. The length-weight relationship for the pooled samples were derived for intercept a=0.0286, slope b=2.857 and coefficient of determination r²=0.917. The values obtained for growth parameters of Lâˆž was 67.86 cm, for growth coefficient (K) 0.70 and for t_o-0.26y^-1. The natural, total and fishing mortalities recorded as 0.86, 1.48 and 0.62 y^-1,respectively. The exploitation ratio (F/Z) was observed as 0.42. The M/K ratio was estimated at 1.23. The average fork length of 46 cm and weight of 2024 g were estimated in the samples collected. The length at the end of 1^st year to 5^th year was observed to be 33, 52, 64, 70 and 75 cm, respectively. The fishing mortality derived in this study is more than the optimum and limit value indicated the sign of overexploitation.

Mudumala, V. K., Farejiya, M. K., Mali, K. S., Rao, K. R., Ankush, P. S., & Anandhan, S. (2018). Investigations on the age, growth and mortality parameters of Kawakawa, Euthynnus affinis (Cantor, 1849) from the North west coast of India. International Journal of Aquatic Biology, 6(1), 21–24. https://doi.org/10.22034/ijab.v6i1.394

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