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Journal of Fisheries and Aquatic Science
Year: 2014  |  Volume: 9  |  Issue: 5  |  Page No.: 398 - 406

Growth and Survival of Intergeneric Hybrids of Clarias anguillaris and Heterobranchus bidorsalis in Semi Arid Zone of Nigeria

M.Y. Diyaware and L.U. Onyila    

Abstract: Growth and survival of C. anguillaris, H. bidorsalis and their hybrids fingerlings were investigated under semi arid condition. Thirty five days old fingerlings (32.03±0.69-44.57±1.47 g and 4.70±0.04-5.74±0.12 cm) stocked at 5 fish m-2 were reared for 9 months in polyethylene-lined fish pond (2.5x2.x1.2 m deep) in triplicates (♀Cax♂Ca, ♀Cax♂Hb, ♀Hbx♂Hb and ♀Hbx♂Ca as treatments I, II, III and IV, respectively). The results showed that final mean weights were higher (pooled 8322.00±29.82 g = 509 g fish-1) in the reciprocal hybrids (♀Hbx♂Ca), followed by pure breeds, ♀Hbx♂Hb (7632.70±321.88 g = 508 g fish-1) and ♀Cax♂Hb (5980.30 g = 352 g fish-1). Lowest (4191 g = 232.83 g fish-1) mean final weight was recorded in the pure breeds of ♀Cax♂Ca. Mean Weight Gain (MWG) and Mean Daily Weight Gain (MDWG) were also higher in ♀Hbx♂Ca. No significant (p>0.05) variation was observed in the final mean weight and mean daily weight values of the reciprocal hybrids compared to those of their paternal pure breeds ♀HbxHb♂. Survival was higher (70.67±1.33%) in pure line ♀Cax♂Ca followed by ♀Cax♂Hb, ♀Hbx♂Ca (69.33±10.91, 65.33±2.67 and 61.33±7.06%, respectively). Positive percentage heterosis was observed in both hybrids progenies. Based on the result of this study, the hybrids of ♀ H. bidorsalisx♂ C. anguillaris performed better than hybrid ♀C. anguillarisx♂H. bidorsalis and the two parental progenies. This indicates that, there are great potentials for exploiting hybrids of African catfishes in the semi arid zone of Nigeria. The performances of the hybrid fingerlings to adult stage in the study area needs to be re-examined to confirm the performance of hybrid species in the harsh weather conditions of the zone.

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