Variation in the biochemical composition of common hake females (Merluccius hubbsi) during the reproductive cycle

Abstract

The biochemical composition and energy content of muscle, liver and gonads of Merluccius hubbsi females during the reproductive cycle were assessed. Adult females (44-50 cm total length) were caught in the Patagonian area (43° S-45° S). Condition factor (K) and hepatosomatic index (HSI) were estimated. Proteins and lipids in each tissue were determined. Besides, water and ashes content in muscle was analyzed. In all tissues the biochemical components underwent variations during the reproductive cycle. During the process gonads showed a significant drop in protein and lipid content (P < 0.01). In muscle, a decrease in proteins (P < 0.01) and lipids in the postspawning period was observed; the percentage of both components increased during the resting stage. The same pattern was verified in the liver. The energy content was lower in the postspawning stage (P < 0.05). A positive relation of K with lipids of muscle and liver and of HSI with lipids and proteins of liver and lipids of muscle was observed. The decrease of lipids and proteins during the postspawning stage would reflect an important energy output during the reproductive cycle.