EFFECT OF PARTIAL REPLACEMENT OF FISHMEAL WITH AFRICAN YAM BEAN (SPHENOSTYLIS STENOCARPA) MEAL ON GROWTH PERFORMANCE AND GONAD DEVELOPMENT OF AFRICAN CATFISH HYBRID (HETEROCLARIAS) FINGERLINGS

J. J. Okeke, C. K. Obazie, P. A. Okeke, K. N. Ibemenuga, M. C. Onwosu, V. N. Arazu

Abstract


The efficacy of replacing fishmeal with African yam bean (AYB) (Sphenostylis stenocarpa) meal in the feed of African catfish hybrid (Clarias gariepinus ♂ x Heterobranchus bidorsalis♀) on growth and gonad development was evaluated for a period of 10 weeks. The experimental diets contained African yam bean meal at levels of 0% (Diet 0), 25% (Diet 1), 50% (Diet 2), 75% (Diet 3) and 100% (Diet 4) of the total dietary protein respectively. A total of 165 fingerlings of homogenous size were introduced into 15 aquaria of 50 litres volume, each randomly assigned to the five diets. Each treatment was replicated thrice with 11fingerlings in each aquarium. The following growth indices were monitored: weight gain, percentage weight gain, specific growth rate, food conversion ratio and protein efficiency ratio. Histological analysis of the ovary samples harvested from the fish in the different feeding groups was also conducted. The group fed control diet had significantly higher weight gain, percentage weight gain, specific growth rate and protein efficiency ratio than those fed AYB 75% diet. Oocyte development in the various sampled gonads was observed to be in different development stages (immature, early maturing and late maturing). The least oocyte development was seen in the group of fish fed with AYB 75% and AYB 100% diet. Thus fishmeal is a better protein source for Heteroclarias than Sphenostylis stenocarpa.

Keywords


Partial replacement, African yam bean, Growth performance, Gonad development Heteroclarias

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