Parasite species Taxonomic group Number of fish infested (%) Total parasites distribution (%) Parasites burden (%) χ2(P- value)
Oreochromis niloticus Clarias gariepinus Cyprinus carpio
Contracecum Nematoda 47
(20.9%)
56
(77.8 %)
0
(0 %)
103
(44.4 %)
223
(42.6 %)
147.324
(0.000)
Clinostomum Trematoda 76
(33.8%)
0
(0 %)
0
(0 %)
76
(32.75 %)
202(
38.6 %)
77.452
(0.000)
Camallanus Nematoda 0
(0 %)
19
(26.4)
0
(0 %)
19
(8.18 %)
41
(7.8 %)
94.060
(0.000)
Eustrongylides Nematoda 6
(2.7%)
0
(0 %)
0
(0 %)
6
(2.6 %)
14
(2.7 %)
5.060
(0.08)
Ligula intestinalis Cestoda 0
(0 %)
0
(0 %)
18
(15.7 %)
18
(7.75 %)
27
(5.2 %)
48.611
(0.000)
Proteocephalus Cestoda 0
(0 %)
10
(13.9 %)
0
(0 %)
10
(4.3 %)
16
(3.1 %)
48.397
(0.000)
Total   129 (55.6%) 85(36.6%) 18(7.8 %) 232 (100 %) 523 (100 %)  
Table 2: Frequency distribution of internal parasites of Oreochromis, Clarias and Cyprinus species at Lugo Lake.
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