Abstract
Reciprocal, interspecific hybrids of Clarias gariepinus and Clarias anguillaris were produced via hypophysation and dry stripping. Two-week-old fry (0.06 ± 0.02 g) of the parental Clarias species and their interspecific hybrids were stocked in duplicated 1 m3 hapas suspended in outdoor earthen ponds (16 m2) for a rearing period of 56 days. Growth and survival of the hybrids was intermediate to the faster growing and better surviving C. gariepinus and the more slowly growing and more vulnerable C. anguillaris parental lines. The weight gain attained by C. gariepinus, C. anguillaris, C. gariepinus (♂) × C. anguillaris (♀), and C. anguillaris (♂) × C. gariepinus (♀) were 3.18 g, 2.99 g, 3.16 g and 3.05 g, respectively. Among hybrids, the growth of C. gariepinus (♂) × C. gariepinus (♀) was higher than the reciprocal C. anguillaris (♂) × C. gariepinus (♀). Heterosis for growth was a negligible 0.65% and for survival was negative (−5%). C. gariepinus appears to be the best species for aquaculture in terms of growth rate and survival.
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