Table 1. Sex ratio of Oreochromis niloticus at different sampling months (n = 816) rom Lake Hawassa

Months	Male	Female	Total	Sex ratio	χ2
February	59	53	112	1:0.90	0.32
March	27	31	58	1:1.15	0.28
April	44	31	75	1:0.83	2.25
May	30	44	74	1:1.47	2.65
June	30	30	60	1:1.00	0.00
July	27	26	53	1:0.96	0.02
August	33	20	53	1:0.61	3.19
September	32	25	57	1:0.78	0.86
October	39	35	74	1:0.90	0.22
November	37	26	63	1:0.70	1.92
December	41	29	70	1:0.88	2.06
January	31	36	67	1:1.16	0.37
Total	430	386	816	1:0.93	2.37