Investigation of age composition and growth of cod Gadus morhua morhua of the Barents Sea in connection with the estimation of its stocks state

The age composition of catches and growth of the cod Gadus morhua morhua in the Barents Sea were investigated on the materials, collected in 2002–2006 in comparison with the data for the previous fishing periods. Analysis of data on the age composition indicated that the range of age groups had not...

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Published in:Journal of ichthyology 2009, Vol.49 (1), p.47-55
Main Authors: Kotenev, B. N., Kuznetsova, E. N., Bondarenko, M. V.
Format: Article
Language:English
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Biomedical and Life Sciences
Gadus morhua morhua
Life Sciences
Marine
Zoology
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description The age composition of catches and growth of the cod Gadus morhua morhua in the Barents Sea were investigated on the materials, collected in 2002–2006 in comparison with the data for the previous fishing periods. Analysis of data on the age composition indicated that the range of age groups had not changed since the beginning of the past century; however, a part of the younger age groups in the catches increased. The likeness of the cod sizes in the present period with those of the individuals of the same age caught in 1949–1980 and the significant decrease of the sizes as compared with those observed in 1981–1993 are observed. It is possible to suppose that the present decrease of indices of cod growth is connected with an increase of its numbers. A selective effect of the trawl fishery withdrawing in the first place the quick-growing individuals can be another factor that determined the decrease of body sizes of the fishes of the same age.
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subjects Biomedical and Life Sciences
Gadus morhua morhua
Life Sciences
Marine
Zoology
title Investigation of age composition and growth of cod Gadus morhua morhua of the Barents Sea in connection with the estimation of its stocks state
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