Population Structure of the Freshwater Crab Potamon algeriense (Bott, 1967) Inhabiting Oued Zegzel, (Northeast of Morocco)

Table 1

Sex ratio by size class of Potamon algeriense from Oued Zegzel, Morocco, over one year period ().

Size class	Males		Females		Total	Sex ratio		Significance
	N	%	N	%
6–10	2	100.00	0	0.00	2	—		NS
11–15	24	85.71	4	14.29	28	6 : 1		S
16–20	69	57.98	50	42.02	119	1.38 : 1		NS
21–25	71	56.80	54	43.20	125	1.31 : 1		NS
26–30	47	40.87	68	59.13	115	0.69 : 1		NS
31–35	56	55.45	45	44.55	101	1.24 : 1		NS
36–40	44	51.16	42	48.84	86	1.04 : 1		NS
41–45	35	64.81	19	35.19	54	1.84 : 1		S
46–50	18	72.00	7	28.00	25	2.57 : 1		S
51–55	10	83.33	2	16.67	12	5 : 1		S
56–60	1	100.00	0	0.00	1	—		NS
61–65	1	100.00	0	0.00	1	—		NS
Total	378	56.50	291	43.50	669	1.30 : 1		S