Observations on some aspects of biology and population dynamics of the Scad Decapterus Russelli (Ruppell)(Carangidae) in the trawling grounds off Kakinada

Murty, V Sriramachandra (1991) Observations on some aspects of biology and population dynamics of the Scad Decapterus Russelli (Ruppell)(Carangidae) in the trawling grounds off Kakinada. Journal of the Marine Biological Assocation of India, 33 (1&2). pp. 396-408.

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Abstract

Decapterus russelU (Ruppell)* is abundaat 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.

Item Type:Article
Uncontrolled Keywords:Scad; Decapterus russelli ; Ruppell
Subjects:Marine Fisheries > Population Dynamics
Demersal Fishes > Carangids
Divisions:CMFRI-Cochin > Marine Capture > Demersal Fisheries
ID Code:1172
Deposited By:Edwin Joseph
Deposited On:21 Jun 2010 12:27
Last Modified:21 Jun 2010 12:27

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