Studies on the age, growth and mortality rates of Indian scad Decapterus russelli (Ruppell) from Mumbai waters

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• 作者：Jaiswar ; A.K. ; Chakraborty ; S.K. ; Swamy ; R.P.
• 关键词：Asymptotic length ; Growth coefficient ; Mortality rates ; Exploitation ratio ; Indian scad ; Decapterus russelli
• 刊名：Fisheries Research
• 出版年：2001
• 出版时间：November, 2001
• 年：2001
• 卷：53
• 期：3
• 页码：303-308
• 全文大小：158 K

文摘

Investigations have been carried out on the age, growth and mortality of Decapterus russelli (Ruppell) based on the length frequency data. The asymptotic length (L_∞) and growth coefficient (K) were estimated as 240mm and 1.42yr⁻¹, respectively. The species grows from 182 to 226mm at the end of I and II years of life. The total, natural and fishing mortalities were 7.75, 2.63 and 5.12yr⁻¹, respectively. Munro’s phi prime was 2.91. The exploitation rate (U) and exploitation ratio (E) were 0.65 and 0.66, respectively. As the exploitation ratio (E) is well beyond the optimum, there is every likelihood of some threat of stock depletion.