[01] Egbal Osman Ahmed, Department of Fish Science, AL Neelain University, Khartoum, Sudan. [02] El Nouman Babikir Ahmed, Department of Fish Science, AL Neelain University, Khartoum, Sudan. [03] Alresala Abdalrhman Mahmoud, Department of Fish Science, AL Neelain University, Khartoum, Sudan. [04] Ghada Ahmed Elhag, Department of Fish Science, AL Neelain University, Khartoum, Sudan.

This study was conducted on three commercial Nile fish to determine the type of food and their feeding habits. A total of 450 Oreochromis niloticus, Labeo niloticus, and Schilbe mystus samples were collected from the Jabal Aulia reservoir area, (White Nile), which lies about 40 km south of Khartoum. The looking for was made for the total& standard length, body weight, relative length to the alimentary canal, and examination of gut substance. The study indicated that Oreochromis niloticus feeds generally on the remains of plants, aquatic plants, phytoplankton, and a few zooplankton, and thus it can be respected as an omnivorous species. Investigation of the stomach substance of Labeo niloticus is essential herbivorous eating differences of plant food, which is affirmed through the proportion of intestinal length to body length, is longer 12.2 times to the standard length. The study additionally confirmed that Schilbe mystus are predatory carnivores that feed normally on small fish, insects, crustaceans, and molluscs. The result appeared that the length of the intestine is different, corresponding to the kind of feeding. The intestine is very long in the vegetarian species Labeo niloticus, and short in the carnivorous species Schilbe mystus, while it was medium to long in Oreochromis niloticus with double feeding with more vegetarianism. This considers concluded, in understanding the nature of the food,, the significance of presenting Labeo niloticus with plant and bottom feeder into a polyculture system in which Tilapia is the predominant fish and fundamentally based on the sort of food. It moreover concluded that the Schilbe mystus fish can be utilized in combating the excessive reproduction of Tilapia fish in farms.

Feeding habits, Wight Nile Fishes, Gut Conten

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