Evaluation of supplementary feeds and optimum ration for Chanos chanos (Forskal) fry
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Date
1991
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Department of Aquaculture, College of Fisheries, Panangad
Abstract
The present study was conducted in C. chanos fry,to evaluate the efficacy and keeping quality of supplementary feeds compounded from five different protein sources viz., fish meal ( FM ), squid meal (SQM), clam meal (CM), prawnhead waste meal (PHM) and soybean meal (SYM). All the feeds used in the study were isocalorific (3.13 - 3.33 Kcal/g) and isonitrogenous (39.78 - 40.44% crude protein).
The quality of feed after four months of storage was satisfactory as there was not much variation in their nutrient contents.
The FCR of fish fed on various supplementary feeds for 42 days were 1.74, 2.94, 3.65, 5.32 and 10.9 for CM, SQM, FM, SYM and PHM, Respectively. The PER, protein digestibility co-efficient and 0: N ratio indicate that protein from clam meal is better utilized for growth Purposes than those from others. The PER value ranged from 0.23 (PHM) to 1.45 (CM). The protein digestibility co-efficient, for CM, SQM, FM, SYM and PHM were 97.24,91,86, 86.56, 77.78 and 65.23%, respectively. The 0: N ratio was highest (10.769:1) for fish fed on CM. It seems that C. chanos fry digest lipid from animal protein sources better (digestibility values ranging from 84.17% (PHM) to 98.8% (CM)) than that from plant source SYM (47.49%).The biochemical composition of fish Showed maximum synthesis of protein and deposition of fat in fish fed on CM, followed by SQM, and the least in fish fed on PHM. The evaluation of supplementary feeds based on survival rate, gain in length and weight, and specific growth rate indicate the superior performance of animal protein sources (except prawn head waste meal) to plant source. The highest gain in growth was attained by fish fed on CM, followed by SQM and FM. Performance of fish fed on SYM was not satisfactory, while PHM was a poor feed for C. chanos fry.
The optimum food ration of fry is at 5.2% of the body weight when fed with CM, twice a day, at 4-6 ppt salinity.
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