Age Composition, Growth and Mortality of European Hake Merluccius merluccius (Linnaeus, 1758) (Actinopterygii: Merlucciidae) from the Sea of Marmara, Turkey


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Kahraman A. E. , Yildtz T., Uzer U. , Karakulak F. S.

ACTA ZOOLOGICA BULGARICA, cilt.69, ss.377-384, 2017 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 69 Konu: 3
  • Basım Tarihi: 2017
  • Dergi Adı: ACTA ZOOLOGICA BULGARICA
  • Sayfa Sayıları: ss.377-384

Özet

This study deals with the age composition, growth and mortality of European hake Merluccius merluccius (L.) from the Sea of Marmara, Turkey. A total of 777 European hakes were sampled monthly from October 2014 to September 2015. Total lengths of all sampled individuals ranged from 10.4 cm to 55.3 cm. The length-weight relationship for all samples was calculated as W = 0.9656 L-2.989. The ages of the specimens ranged from 1 to 6. Growth parameters calculated according to the von Bertalanffy Growth Equation were L-infinity=106.358 cm, k = 0.082, t(0) = -1.097 for females, L-infinity = 102.431 cm, k = 0.091, t(0) = -0.829 for males, and L-infinity = 103.971 cm, k= 0.087, t(0) = 0.926 for all samples. According to age structure analysis, the total, natural and fishing mortality rates were calculated as 2.01, 0.19, and 1.81, respectively. The exploitation rate, E = 0.90, indicated an over-exploitation on the European hake stocks in the Sea of Marmara.

This study deals with the age composition, growth and mortality of European hake Merluccius merluccius (L.) from the Sea of Marmara, Turkey. A total of 777 European hakes were sampled monthly from October 2014 to September 2015. Total lengths of all sampled individuals ranged from 10.4 cm to 55.3 cm. The length–weight relationship for all samples was calculated as W = 0.9656 L 2.989 . The ages of the specimens ranged from 1 to 6. Growth parameters calculated according to the von Bertalanffy Growth Equation were L∞ = 106.358 cm, k = 0.082, t0 = –1.097 for females, L∞ = 102.431 cm, k = 0.091, t0 = –0.829 for males, and L∞ = 103.971 cm, k = 0.087, t0 = –0.926 for all samples. According to age–structure analysis, the total, natural and fishing mortality rates were calculated as 2.01, 0.19, and 1.81, respectively. The exploitation rate, E = 0.90, indicated an over-exploitation on the European hake stocks in the Sea of Marmara.