Abstract
The study was carried out between September 2011 and August 2013, using 328 Clarias gariepinus in Oba reservoir, Oyo State, Nigeria. Standard methods were used to determine gonado-somatic index (GSI), fecundity values, and enteroparasitic infestation of the fish. Sex ratio was 1.3:1, male to female, and females on an average invested 20.54% of its body weight in egg production while male GSI was 6.05 ± 0.19%. Spawning was prominent in rainy season; the fish was highly fecund (31,169 eggs) with relative fecundity of 222 ± 10 eggs per gram weight of fish. Fecundity correlated linearly (positive) with gonad weight, body weight, total length and GSI. Over fishing, led the fish to invest its body weight and growth in egg production, to increase and enhance its chances of survival. Parasites recovered were Procamallanus laevionchus, Paracamallanus cyathopharynx, Anomotaenia species, Monobothrium species, Polyonchobothrium clariae, and Neoechinorhynchus rutili. Prevalence and intensity were higher in female than in male and more in dry than rainy season. Parasitic infestation reduces weight growth in the fish; this influenced the values of reproductive indices in which body weight was a numerator or denominator. Keywords: Clarias gariepinus, enteroparasites, fecundity, gonado-somatic.
Highlights
Studies on fish fecundity are important to evaluate the reproductive potentials of the species (Duarte and Araujo, 2002)
This study investigated some aspects of reproductive indices and enteroparasitic infestation of C. gariepinus, to determine the effect of parasitism on reproductive indices
Parasitic infestation in Oba Reservoir was found to reduce the growth in weight of the fish; thereby reducing the regression coefficient (b) to a value less than three
Summary
Studies on fish fecundity are important to evaluate the reproductive potentials of the species (Duarte and Araujo, 2002). It gives prerequisite information needed to plan a breeding programme so as to determine how many eggs would be spawned or stripped, the amount of rearing facilities required and the extent to which various culture equipment would be put to use (Eyo and Mgbenka, 1992). Clarias gariepinus (Burchell, 1822) belongs to family Clariidae, and can survive low water levels and associated reduced oxygen levels due to their possession of accessory air breathing organ (Akinsanya and Otubanjo, 2006). The species is important for the economy of Ogbomoso and surrounding settlements, it is actively caught by the local fishermen because of its high growth rate. Reproductive biology of members of the Clariidae family and other culture-able
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