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Ibrahim, Baba Usman* and Ogwu, Esther Cynthia
Department  of  Biology
Faculty  of  Natural Sciences
Ibrahim Badamasi Babangida University
Lapai .
Niger State. Nigeria

Hybridization studies carried out on the offspring of two genetic crosses derived from two Clariid catfishes; Clarias gariepinus and Heterobranchus longifilis. At the hatchery of Ibrahim Badamasi Babangida University, Lapai. In this present study breeding of Clarias gariepinus and Heterobranchus longifilis was carried out, specimens of Clarias gariepinus female and Heterobranchus longifilis male fishes were obtained from Federal College of Fisheries, New Bussa, Niger State. The brood stock were acclimatized for one week in plastic container and fed with Vita feed. The female fish sample was injected with Ovaprim hormone (0.5ml), and allowed to stay for a latency period of 12hours after which the eggs were stripped into a dry sterile plastic bowl. The male was sacrificed through dissection and the testes were removed from the lobes into a dry petri dish, little physiological saline solution was added, the milt obtained from the male was then poured on the collected eggs from the female, and mixed with a dry clean feather for fertilization to take place. After fertilization, the growth (Length and weight) were taken weekly. The comparative growth and survival at the end of the ten (10) weeks indoor rearing showed that interspecific pure breeding of C. gariepinus male and female had the best survival. The comparison of weight, weight gain and specific growth rate showed that the intergeneric cross of C. gariepinus female and H. longifilis male were more outstanding with a specific growth rate ( SGR), when compared to the other at the end of  10 weeks  growth studies.

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