Table 2. The sex ratio of the three major commercial fish species from the Ribb Reservoir

Species	Number of fishes			Sex ratio	χ2	p-value
	Total	Females	Males
Oreochromis niloticus	752	353	399	0.88:1	102.4	0.157
Labeobarbus intermedius	498	317	181	1.75:1	111.53	0.011*
Clarias gariepinus	379	192	187	1.03:1	82.23	0.472
Total	1,629	862	767	1.12:1	241.345	0.003*

Chi-square test is significant at the level of p < 0.05.