台湾の養殖および天然ボラにおける性比および成長等の差異〔英文〕

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Wild mullet caught during the spawning season by set net in 1990 showed a sex ratio (female: male) of 27 to 34 (44.3% female). Cultured mullet of 1 and 2 years (1 +, 2 +) fed with a diet con-taining 25± protein and 3500 kcal/kg showed a female ratio of 13.0% in 607 mullet of 2 + years and of 15.7% in 643 mullet of 1 + year. Diet containing 10 ppm estradiol 17β resulted in a female ratio of >94.7% in a population of 223 1 + mullet specimens. The mean body weight of 1 + cultured grey mullet was 900g (500-1100g). That for 2+ was 1700g (700-2500g), that for 3 + 2700g (2100-3100g). Growth rate in weight was faster in 1 + than in 2 + cultured mullets. That in total length (L; cm) of 1 + and 2 + were similar. The con-dition factor (a) for the 2 + and 3 + cultured grey mullet was 1.108+0.168, while a=1.139±0.168 for female and 1.096±0.180 for male, for female andmale will mullet were 0.850±0.043 and 0.741±0.095, respectively. An intraperitoneal fat body (IPF) containing 94.8-98.7% lipid contributed to 4.01±2.04 to 5.44±2.53% of body weight in the 1-3 years cultured mullet. None was found in wild mullet. The hepatosomatic index was 1.03±0.43 to 1.38±0.35% and decreased with age for cultured mullet and 1.19±0.20% for wild mullet.
日本水産學會の論文