Table 1. Monthly variations in the sex ratio of S. olivacea randomly collected from Paikgachha, Khulna.

Months	Total no. of specimens	Total male	Percentage of male	Total female	Percentage of female	Sex ratio
April	28	10	35.71	18	64.29	1: 1.8
May	42	28	66.67	14	33.33	1: 0.49
June	30	13	43.33	17	56.67	1: 1.30
July	37	20	54.05	17	45.95	1: 0.85
August	22	5	22.73	17	77.27	1: 3.4
September	28	19	67.86	9	32.14	1: 0.47
Total	187	95		92		1: 0.96

p>0.05is not significantly different.