Survival And Growth Rate Of Heterobranchus Longifilis Induced With Ovaprim And Pituitary Extract Of Heterobranchus Longifilis

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SURVIVAL AND GROWTH RATE OF HETEROBRANCHUS LONGIFILIS INDUCED WITH OVAPRIM AND PITUITARY EXTRACT OF HETEROBRANCHUS LONGIFILIS

Abstract
The growth and survival of Clarias anguillaris(Ca), Heterobranchus(Hb) fry and their reciprocal hybrids fed locally formulated diet (42.5% Crude protein) at 5% body weight for 56 days was studied in two different culture units (concrete ponds and circular plastic tanks). Fry were fed twice daily at 8:00hours and 18:00hours. Under the concrete ponds, results showed that final mean weight was higher in the pure breed Hb
Introduction
In recent years, the culture of species of the catfish belonging to the Claridae family is fast gaining
global attention [1] . African catfish commonly cultured in Nigeria are Clarias gariepinus and C. anguillaris,
Heterobranchus bidorsalis and H. longifilis and their hybrids. The reason for their suitability for culture include,
their ability to withstand poor water quality, high stocking density, stressed condition and high feed conversion
efficiency among others.
The African catfish, Clarias and Heterobranchus species are considered as a highly priced fish in
Nigeria and Africa at large [2] . Heterobranchus species grows faster and attains bigger size than Clarias species
which matures earlier [3] . One fish that has attracted great attention for culturing in Nigeria is the catfish hybrid
often called ‘Heteroclarias’ [4] .The hybrid catfish grow fast and has a high survival rate [5] . Other desirable
qualities that make this fish highly commendable for pond culture are high fecundity, better taste and nutritional
qualities, tolerance to unfavorable environmental conditions ([6] , omnivorous feeder, resistance to disease and
high market demand [7] .
Hybridization of the African catfish (Clarias gariepinus) with the Thai catfish (Clarias macrocephalus)
resulted in the production of offspring that had better characteristics than their parents [8] . The current growth of
aquaculture in Nigeria and most part of the world can only be sustained by the production of fish seeds with
high fertilization and survival rates, high feed conversion efficiency, high growth rates and high disease
resistance among other factors
African catfish have been raised in different environment under different feeding condition without
clearly defining which culture unit is most suitable. According to [10] , cultivation techniques for Clarias species
consist of three basic steps: (1) primary rearing phase (larva to fry), (2) secondary rearing phase (fry to
fingerling/juvenile) and (3) final rearing phase (growing to marketable size). The aim of this study was to
evaluate the growth and survival of Clarias angullaris, Heterobranchus bidorsalis fry and their reciprocal hybrids
reared in nursery concrete ponds and circular plastic tanks fed locally formulated feeds.
II.Materials And Methods
Two weeks old fry of Clarias anguillaris, Heterobranchus bidorsalis and their reciprocal hybrids were
obtained from Bida fish farm in Karewa, Yola and transported to Department of Fisheries Research Farm,
Modibbo Adama University of Technology, and Yola. Fry were kept in rearing tanks and allowed to acclimatize
for two days before the commencement of the research

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