Production of hybrid vigor through cross breeding between Clarias batrachus Lin. and Clarias gariepinus Bur.
Heterosis was studied at different stages from larval to market size in F1 hybrids of catfish (♀ C. batrachus × ♂ C. gariepinus and ♀ C. gariepinus ♀ × ♂ C. batrachus). The averages of performance traits (hatching rate, viability of larvae, growth and survival) of ♀ C. batrachus × ♂ C. gariepinus were significantly better than those of the reciprocal hybrid and control sibs of the parental species. Most surviving reciprocal hybrids were deformed and abnormal, which later resulted in a high mortality rate.