Biology and stock assessment of Tachysurus jella (Day) from Mumbai waters

Raje, S G and Dineshbabu, A P and Das, Thakur (2008) Biology and stock assessment of Tachysurus jella (Day) from Mumbai waters. Indian Journal of Fisheries, 55 (4). pp. 295-299.

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Abstract

Biological parameters such as length-composition, food and feeding, length-weight relations and growth of Tachysurus jella was studied using the data collected during 1987-2003. The occurrence of empty stomach was high (70%). Stomach content analysis revealed that the fish is a carnivore feeding mainly on bottom dwelling crustaceans (Preponderance Index, PI : 97.3) such as Squilla spp. (PI: 39) and crabs (PI: 35). The length-weight relationship was Log W = -5.7938 + 3.4426 Log L (r = 0.96). Estimated values of L∞ and K were 518 mm and 0.65yr-1 respectively. It was estimated that T. jella reaches 278 mm at the end of one year and 377 mm in two years. The longevity was estimated to be 4 to 4 ½ years. Stock assessment of T. jella during 1987-1999 indicated that the stock was overexploited (E = 0.73). Higher fishing effort and sharp reduction in yield during 2000 - 2004 confirmed that the species was under heavy fishing pressure and regulatory measures have to be imposed to sustain and improve the fishery of this species.

Item Type:Article
Uncontrolled Keywords:Stock assessment: Tachysurus jella
Subjects:Marine Fisheries > Stock Assesment
Divisions:CMFRI-Cochin > Marine Capture > Demersal Fisheries
ID Code:114
Deposited By:Edwin Joseph
Deposited On:11 Mar 2010 15:47
Last Modified:11 Mar 2010 15:47

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