Keywords
Aquafeed
Fish
Growth
Abstract
An 8-week feeding trial was conducted to evaluate the potential of water spinach (Ipomea aquatica) leaf meal (SLM) as dietary energy source in the diet of Coptodon zilli juvenile. Five isocaloric diets of 40% crude protein were formulated to contain 0, 15, 30, 45 and 60% I. aquatica leaf meal (Diets 1-5) to partially replace maize in the Coptodon diet. The diet containing 0% leaf meal served as the control. Coptodon zilli juveniles were reared in 50L rectangular experimental tanks. Each dietary treatment was tested in triplicate groups of 10 fish per tank. The fish were fed at 5% body weight per day. The best growth response in terms of mean weight gain was obtained in fish fed 15% I. aquatica diet inclusion (12.47±2.05g), while Fish fed 60% I. aquatica based was lowest (10.50±0.47g). The highest FCR was obtained in Fish fed 60% I. aquatica (3.07±0.79), while the lowest was obtained in fish fed 15% I. aquatica (2.42±0.50). The results of the growth and nutrient utilization responses show that there were no significant differences (p>0.05) among the fish fed diets T1-T5 (0-60% Ipomea aquatica leaf meal). There were no significant differences (p>0.05) in the carcass composition of Coptodon zilli juvenile fed on experimental diets. The cost benefit analysis of the diets shows that there were reductions in the cost per kilogram as the inclusion level of I. aquatica increased. The present findings show that Ipomea aquatica leaf meal has good potential for use as one of the energy sources in Coptodon zilli diet up to 15% level without compromising growth performance.
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