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The present study is aimed to provide information on the abundance of natural foods needed by Mugil cephalus in the Elechi Creek. The natural food of M. cephalus in the Elechi Creek was studied from stomach contents of the fish. The stomach contents were analyzed using two methods; the frequency of occurrence and numerical methods. Plant materials, diatoms, algae and dinoflagellates constituted its main food. Plant materials were found to be the most preferable food where it occurred in 67.0% of the examined fish. Annelids, fish larva, fish parts, insect parts and crustaceans comprised the food of animal origin. Sand/mud and organic matter occurred in about 11.0 and 73.0% of the examined stomachs respectively. These results indicate that M. cephalus is omnivorous plant materials were the most abundant food items by numerical and occurrence methods in the gut of the fish species.

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Fingerlings of Clarias gariepinus were fed six isocaloric diets at different crude protein levels at 5% of body weight to determine the growth and survival of the species. Growth rate and weight gain increased progressively with dietary protein level to a maximum at 35%. Significant differences (p<0.05) were recorded for the growth indices, weight gain and average daily growth rate. Nutrient utilization parameters had variable results among the treatments. There was no significant difference (p> 0.01) in apparent feed conversion ratio, but the nitrogen metabolism showed significant variations. The results obtained indicated that fish fed 35% crude protein diet performed best in weight gain, food conversion ratio and nitrogen metabolism.

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