Comparison of parasitic helminth infection between the different age groups of Clarias gariepinus from Asa dam Ilorin, north-central Nigeria
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A total of 160 specimens of Clarias gariepinus comprising three age groups – juveniles (standard length
10.0 – 29.9 cm), sub-adults (fish length 30.0 – 39.9 cm) and adults (fish length 40.0 – 59.9 cm) were
collected over a period of 8 months from Asa dam, a major river in Ilorin. The fish length and weight
ranged from 12.5 to 41.0 cm and 152 to 597 g respectively. They were subjected to parasitological
examinations. two cestode types - Amonotaenia sp and Polyonchobothrium clarias; two nematode
types - Paracamallanus sp and Procamallanus laevionchus and one acanthocephalan – Neoechinorhynchus
rutili were detected. Eighty-eight parasites were recovered. 27.5% of all fish examined showed
parasitic infection. Helminth infection was found in juveniles and sub-adults only. Infection rate was
higher in sub-adults than in juveniles.
Keywords
Q Science (General), QH301 Biology