Incidence of Parasites of Clarias gariepinus (Burchell, 1822) Caught from Lake Alau, Maiduguri, Borno State, Nigeria
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Keywords

Incidence
Endoparasites
Clarias gariepinus
Lake Alau
Maiduguri
Nigeria

Abstract

The incidence of parasites of Clarias gariepinus from Lake Alau was investigated in this study. The incidence and intensity of infection of endoparasites based on the sex of Clarias gariepinus revealed that of out the one hundred (100) samples of Clarias gariepinus examined, 31% were infected, with females having a lower incidence rate of 27.5% than the male with 38.7% (p<0.05). The incidence of endoparasites in relation to the total length of Clarias gariepinus. revealed that length groups of 32.5 - 36.4 and 36.5 – 40.4 cm had a significantly (p<0.05) higher incidence
of 60.9% and 66.7% compared with length groups of 24.5 – 28.4 and 28.5 – 32.4 cm with 21.2% and 23.1% respectively, the length group of 20.5-24.4cm had an incidence of 0%. The incidence of endoparasites in relation to the body weight of Clarias gariepinus revealed that weight groups of 331-380 and 381-430 grams had significantly (p<0.05) higher incidence rates of 70%, and 100% compared with other body weight groups considered. The incidence of endoparasites in relation to the standard length of Clarias gariepinus revealed that standard length groups of 33.5
– 35.4, 29.5 – 31.4 and 31.5 – 33.4 cm had a significantly (p<0.05) higher incidence of 60.0%, 61.5%, and 75.9% compared with other standard length groups considered. The incidence of endoparasites in relation to their taxonomic group revealed a higher incidence for Cestoda (58.1%) compared with Nematoda (22.6%) and Trematoda (19.4%) (p<0.05). The incidence rates of haemoparasites and endoparasites based on their species revealed that haemoparasites were Hemogregarina with 61%, Babesiosoma with 9.7% and Trypanosoma with 3.2% (p<0.05). The cestode Diphyllobothrium had an incidence of 25.8%, the nematode Contracaecum had 25.8% and the trematode Crepidostomum had 9.7% (p<0.05). In conclusion, Clarias gariepinus from Lake Alau are afflicted by several parasites that are of economic importance.

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