Branchial Chamber and Gastrointestinal Tracts Parasites of Fish Species in Benue and Niger Rivers, North Central, Nigeria

Table 4

Sex-specific prevalence of parasites in fish species in rivers Niger and Benue at Lokoja.

Fish species	Sex	Number examined	Number positive	Chi-square	df	value
Clarias sp.	M	48	32 (66.7)	8.889	1	0.003
	F	72	64 (88.9)
		120	96 (80.0)
Tilapia zillii	M	44	42 (95.5)	0.005	1	0.942 ns
	F	41	39 (95.1)
		85	81 (95.3)
Oreochromis niloticus	M	50	44 (88.0)	0.319	1	0.572 ns
	F	47	43 (91.5)
		97	87 (89.7)
Synodontis schall	M	32	20 (62.5)	1.905	1	0.168 ns
	F	36	28 (77.8)
		68	48 (70.6)
Megalops atlanticus	M	28	10 (35.7)	0.161	1	0.688 ns
	F	42	17 (40.5)
		70	27 (38.6)
Overall	M	202	148 (73.3)	3.014	1	0.083 ns
	F	238	191 (80.3)
		440	339 (77.0)

Significant at . ns, not significant at .