Seasonal variations in the chemical composition of the catfish,Heteropneustes fossilis (Bloch)
Seasonal variations in the various biochemical constituents of muscle and liver were studied in the catfish,H. fossilis (Bloch). The fat content of the muscle showed two peak periods of accumulation—one during November and other during May–July. Liver was more rich in fat than the muscle and it was also characterised by two distinct phases of high fat contents in May and in September. Moisture variations were found related inversely to the quantitative changes in the fat content. Protein and ash contents were also greatly influenced by seasons. In general protein and ash values were low during winter and high during summer or monsoon months. The seasonal cycles of various biochemical constituents in the two tissues of the fish seemed to be governed partly by feeding and partly by the cycle of maturation and depletion of gonad.