Reproductive, survival and growth performance of intergeneric cross of Exotic Dutch Clarias, Heterobranchus bidorsalis and Heterobranchus longifilis in Sokoto North-West Nigeria
Forestry and Fisheries Department, Usmanu Danfododiyo University, PMB 2346 Sokoto, Sokoto state, Nigeria
Gamete from Heterobranchus bidorsalis (Hb), Heterobranchus longifilis (Hl) and Exotic Dutch Clarias (EC) were used to fertilize eggs from female Exotic Dutch Clarias to produce pure Exotic Dutch Clarias and its paternal hybrids in other to assess their induced spawning, survival and growth potentials in the hatchery. The female and males were induced with Ovatide at 0.2 mL kg-1 and 0.1 mL kg-1 body weight respectively and fertilized in triplicate. Hatchlings of each cross were stocked at 500 hatchlings per plastic bowls in a completely randomized design and reared on decapsulated Artemia for four weeks. The percent fertilization was highest (92.67±1.76) in cross EC♂ × EC♀ and was statistically not significant from other crosses (p > 0.05). Highest (42.25±3.82) percent hatchability was obtained in cross Hb♂ × EC♀ but significantly not different (p > 0.05) from other crosses. Cross (Hl♂ × EC♀) showed significantly (p < 0.05) poor survival (35.93±4.23) compared to crosses EC♂ × EC♀ and Hb♂ × EC♀ on decapsulated Artemia. Cross EC♂ × EC♀ had the highest weight gain (0.172±0.003), percent weight gain (17171.0±318.93) and specific growth rate (7.99±0.03) with no significant (p > 0.05) from other crosses. Reproductive performances of the treatments were good while the offspring from cross (EC♂ × EC♀) had the best survival and growth performance.