Keywords
Clarias gariepinus
hybrid
growth
survival
reproductive indices
Abstract
The growth performance and survival of hybrids of Albino Clarias gariepinus x Normal Clarias gariepinus were investigated. Females (2000) and males (1000g) were induced with Ovaprim at 0.5 ml kg-1 body weight. Four genetic crosses were performed viz: Albino C. gariepinus x Albino C. gariepinus (AlbCg x AlbCg), Normal C. gariepinus x Albino C. gariepinus (NCg x AlbCg), Albino C. gariepinus x Normal C. gariepinus (AlbCg x NCg) Normal C. gariepinus x Normal C. gariepinus NCg x NCg). Hatchlings from each cross combination were stocked at 60 hatchlings per 50 liter plastic bowls (55cm diameter) in a complete randomized design and fed 0.2mm -0. 4mm, 0.5, 0.8, 1.0mm and 2mm Coppens feed at various ages for eight weeks. The fertilization rate was significantly (p < 0.05) highest (95%) in NCg while the least (73%) was recorded in off-springs of AlbCg x AlbCg. Higher (82%) hatchability was obtained observed pure line C. gariepinus progenies. The hatchability was significantly (p<0.05) lower in the hybrids between AlbCg x AlbCg compared to the entire crosses. Albino C. gariepinus x Albino C. gariepinus showed significantly (p <0.05) lower (53.33%) survival rate compared to NCg x CNg, NCg x AlbCg and AlbCg x NCg. The NCg x NCg offspring had a better weight gain (16.834±0.35g/day), length gain (5.267±0.29cm), SRG were 2.9% per day and Condition factor 4.91 with significant (p <0.05) from other crosses. Fertilization, hatching, survival rate and growth performance of the offspring of the normal C. gariepinus were better. The hybridization between normal C. gariepinus and albino C. gariepinus produced fry and fingerlings of poor growth and survival compared to normal C. gariepinus.
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