Abstract
1. 1. Seasonal variations in gonadosomatic index (GSI), in liver-index (LSI) and in myosin/actin ratio in actomyosin of mature hakes were investigated. 2. 2. A resting or slow recuperation period and another of rapid transformation (October-February) were observed in gonads of female hakes. The latter occurred earlier in male fish than in female ones. Spawning occurred in March. 3. 3. High LSI values were found after spawning and during gonadal resting period. Low hake LSI values with high GSI ones were observed. 4. 4. Myosin/actin ratio profile was very similar to LSI one. A linear correlation was obtained when LSI values were plotted against myosin/actin ratio ones ( r = 0.858, P < 0.01).
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