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Age, growth and reproduction of European hake (Merluccius merluccius (Linn., 1758)) in the Central Aegean Sea, Turkey

Published online by Cambridge University Press:  05 January 2015

Ozan Soykan*
Affiliation:
Faculty of Fisheries, Ege University, 35100 Bornova, İzmir, Turkey
Akin T. İlkyaz
Affiliation:
Faculty of Fisheries, Ege University, 35100 Bornova, İzmir, Turkey
Gülnur Metın
Affiliation:
Faculty of Fisheries, Ege University, 35100 Bornova, İzmir, Turkey
H. Tuncay Kinacigıl
Affiliation:
Faculty of Fisheries, Ege University, 35100 Bornova, İzmir, Turkey
*
Correspondence should be addressed to:O. Soykan, Faculty of Fisheries, Ege University, 35100 Bornova, İzmir, Turkey email: [email protected]

Abstract

Specimens of European hake were collected by a traditional demersal trawl between July 2004 and June 2007 from İzmir Bay, Central Aegean Sea. A total of 2108 individuals were sampled during the study and the female: male sex ratio of the stock was 1:0.89. The length–weight relationship was W = 0.00341L3.24 (R2 = 0.994) for all individuals. A high gonadosomatic index was evident over most of the year but it was minimal from August to October. The estimated age composition was 1–5 years; the length and weight at infinity were calculated as L = 54.53 cm and W = 1455.77 g respectively. In addition, growth coefficient was found to be k = 0.315 y−1 and to = −0.223 y (R2 = 0.99). Total mortality ratio of the stock was calculated as Z = 1.539 y−1, while natural and fishing based mortality ratio were estimated as M = 0.579 y−1 and F = 0.959 y−1 respectively, with the exploitation ratio (E) of the stock estimated to be 0.624.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2015 

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