Journal of the Marine Biological Association of India

Observations on some aspect of biology and population dynamics of the scad Decapterus russelli (Ruppell) (Carangidae) in the trawling grounds off Kakinada.

Volume 33 Issue 1&2

V. Sriramachandra Murty

Abstract

Decapterus russelli (Ruppell)² is abundant in relatively deeper waters and forms 80-90 % of carangid catches by trawlers. The von Bertalanffy growth parameters are estimated as Loe =• 232.3 mm, K =1.08 per year and to =» —0.08 year. The length-weight relationship can be described by the equation log W (g) = —5.93433+3.40764 log L (mm). The length and age at first maturity are estimated as 150mmand0.88 year respectively. This species spawns offKakinada during December-August. The different mortality rates are estimated as Z = 6.65, M «= 1.90 and F = 4.75 and the length and age at first capture as 158 mm and 0.98 year respectively. The yield per recruit analysis shows that: with t« above 0.6 the Yw/R increases with increased F without reaching maximum. The highest Yw/R, however, is obtained with tc at 0.6 only.

Date : 31-12-1991