한국 서해 대구, Gadus macrocephalus (Tilesius)의 성장특성
Growth characteristic of Pacific cod, Gadus macrocephalus in theWest Sea of Korea
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초록
2007년 1월부터 12월까지 우리나라 서해안 중부해역에서 채집된 대구의 이석을 이용하여 연령 및 성장특성을 조사하였다. 불투명대에서 투명대로 이행하는 경계는 1년에 한번 2월에 형성되고 있으며, 이를 윤문으로 간주하였다. 주 산란기는 12월에서 1월로 추정되어 대구의 초륜이 형성되는 시기는 1월부터 이듬해 2월까지 약 1.08년으로 추정되었다. 윤문형성 시 전장평균치를 이용하여 추정된 매개변수로부터 계산된 von Bertalanffy성장식은 암컷이 , 수컷이 였다. 이들 식으로부터 구한 이론적 최대전장은 암수 각각 100.0cm와 64.6cm였으며, 성장계수는 암수 각각 0.1640/yr과 0.3335/yr로 우리나라 서해안 대구는 수컷에 비해 암컷이 성장이 더 빠르다는 것이 밝혀졌다.
Abstract
The age and growth of the Pacific cod, Gadus macrocephalus were investigated using left sagittal otoliths of 682 individuals collected in the West Sea of Korea from January to December 2007. The seasonal changes in the ratio of an opaque zone to interval between annular rings revealed that the narrow translucent parts of the otolith were annual growth rings formed between February and March once a year. The spawning period was December to January and therefore the duration from fertilization to the complete formation of the opaque zone became thirteen months. From the parameters calculated using the average length when the year ring was formed, the estimated von Bertalanffy growth equations were for females and for males when is total length in age t.
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