Table 1. The frequency of occurrence and volumetric contribution of food items consumed by Oreochromis niloticus in Lake Tinishu Abaya (n = 373)

Food items	Frequency of occurrence		Volumetric contribution
	Occurrence	Percent	Volume (mL)	Percent
Phytoplankton	351	94.11)	387.0	39.51)
Blue green algae	317	85.0	178.5	18.2
Green algae	296	79.4	121	12.4
Diatom	277	74.3	52	5.3
Euglenoids	22	5.9	5.5	0.6
Others	183	49.1	30	3.1
Zooplankton	267	71.61)	127	13.01)
Copepods	181	48.5	40.4	4.1
Cladoceran	119	31.9	25.3	2.6
Rotifers	251	67.3	61.3	6.3
Macrophytes	201	53.91)	253	25.81)
Detritus	277	74.31)	141	14.41)
Insects	78	20.9	46.5	4.8
Diptera	57	15.3	16.2	1.7
Ephemeroptera	40	10.7	9.1	0.9
Coleoptera	13	3.5	7.5	0.8
Hemiptera	47	12.6	8.1	0.8
Plecoptera	8	2.2	5.6	0.6
Nematodes	19	5.1	1.2	0.1
Ostracods	51	13.7	22.7	2.3
Fish scales	11	2.9	1.7	0.2

The food items significantly contributed to the diet of the fish.