동해 중부해역에 출현하는 말쥐치(Thamnaconus modestus ) 암컷의 성숙과 산란
Maturation and spawning of female black scraper, Thamnaconus modestus in the coastal waters off Middle East Sea, Korea
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초록
2015년 3월부터 2016년 2월까지 동해 중부해역에 출현하는 말쥐치의 성숙과 산란생태에 대하여 조사하였다. 암컷의 생식소중량지수 (GSI)는 6월에 가장 높게 나타났고 산란기는 3월부터 9월까지로 나타났다. 암컷의 50% 군성숙전장은 18.02 cm로 추정되었다. 난경의 범위는 0.40~0.58 mm였으며 연간 최소 3회 이상 산란을 하는 것으로 판단된다. 절대포란수는 185,648~9,747,250립으로 나타나 전장과 포란수의 관계식은 F=0.0297TL5.4835로 나타났다.
Abstract
The maturation and spawning of black scraper, Thamnaconus modestus were studied using samples collected monthly from March, 2015 to February, 2016 in the coastal waters off Middle East Sea, Korea. The gonadosomatic index (GSI) of female was the highest in June. The spawning periods lasted from March to September based on histological observation of female gonad development. The percentage of sexually mature females estimated from a logistic function was over 50% for the size group 18.02 cm (total length, TL). The size of eggs spawned was between 0.40 to 0.58 mm. Fecundity varied between 185,648 and 9,747,250 eggs. The relationship between the fecundity and TL of the fish was expressed in the fecundity equation as F = 0.0297TL5.4835.
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