The present study was conducted to determine the nutritive value in terms of proximate composition and seasonal variations in muscle of Channa striata from river Krishna, Andhra Pradesh, India. The biochemical composition such as protein, fat, ash and moisture content in the muscle tissue of fish has been carried out during 2021-22 to know the seasonal changes in relation to reproductive biology. This fish has excellent sources of high quality proteins and nutrients with medicinal value. The composition of protein, fat, moisture and ash contents showed variations in their abundance in different seasons in both females and males. The highest content of protein 24.3±2.2% in south west monsoon and lowest (20.4±2.1%) recorded in North East monsoon in case of females and males was 25.2±2.4% and lowest (22.3±2.2%). The highest content of fat content was 5.4±0.4% was observed in North East monsoon and the lowest (4.3±0.4%) in case of females and males was 5.5±0.3% and lowest 3.6. The highest moisture 83.8±6.4% and was observed in south west monsoon and minimum 80.2 recorded in summer in case of females and males was highest 84.2±6.3% and lowest recorded 80.4 in summer. The ash content was highest 2.19±0.06% in post monsoon and lowest 1.61 in summer in case of females and also males was highest 2.25±0.063% and lowest 1.65 in summer.
Indian mackerel, Rastrelliger kanagurta is one of the commercially vital pelagic fish in east and west coast of India. The present study was analysis the food spectrum of R. kanagurta at different stations of Visakhapatnam coast, i.e., Station 1. Bangarammapalem, Station 2. Rambilli and Station 3. Bheemunipatnam from July 2016 to June 2017. This species was found to be mainly feed on zooplankton goes to 37%, phytoplankton 26%, fish egg and larvae 10.5%, shrimp larvae 11% miscellaneous matter 9% and semi-digested matter 5.5% in case of males and females goes to zooplankton was 36%, phytoplankton 25%, fish egg and larvae 11%, shrimp larvae 11.5% miscellaneous matter 9.5% and semidigested matter 7% was observed in this study. The study clearly explains that the R. kanagurta is a plankton feeder. The present results showed that majority of the guts are empty and range goes to 31-55%, followed by ¼ full was 11-26%, ½ full was 10.5-19%, ¾ full goes to 8-14%, full was 6-13.4% and gorged ranges between 2.5-8.5% in males in different months. In females it was showed that mostly are empty and ranges between 32-51%, followed by ¼ full was 15-30.5%, ½ full was 10.9-19.2%, ¾ full was 8-15%, full was 6-14% and gorged goes to 2.5-6.2% in study period. The feeding intensity was higher during August in case males and females and poor feeding during May and June and remain months are moderate feeding was noticed.
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