Effet de la densité de mise en charge sur les performances zootechniques et la production chez les alevins de Parachanna obscura élevés en milieu contrôlé

Objectifs: Cette etude vise a evaluer les effets de la densite de mise en charge des alevins de Parachanna obscura eleves en captivite sur leurs performances zootechniques et leur production. Methodologie et resultats: Les densites de 10, 15, 20 et 25 alevins / dm 3 d’eau ont ete testees sur les alevins de P. obscura de poids moyen initial 9,6 g nourris au Coppens pendant huit semaines. Chaque densite a ete testee en triplicat. Les resultats obtenus montrent que la densite de mise en charge n’a pas eu d’effet significatif sur le taux de survie qui a ete de 100% pour tous les traitements appliques. Cependant, les parametres de croissance et d’utilisation des aliments ont significativement varie en fonction des traitements (P < 0,05). Le taux de croissance specifique, l’efficacite alimentaire et la production les plus eleves ont ete obtenus avec la densite de 25 alevins / dm 3 d’eau. Conclusion et application: Les alevins de P. obscura sont tres resistants et peuvent etre stockes a une densite optimale de 25 alevins / dm 3 d’eau afin d’augmenter la production et la rentabilite technique et economique des entreprises aquacoles. Mots cles:  Parachanna obscura , alevins, densite, performances zootechniques, production English Title: Effect of stocking density on zootechnical performances and production of Parachanna obscura fingerlings reared in captivity English Abstract Objective: The aim of this study is to evaluate the effects of stocking density on zootechnical performances and production of P. obscura fingerlings reared in captivity.  Methodology and results: Four stocking densities (10, 15, 20 and 25 fingerlings / dm 3 ) were tested on P. obscura fingerlings during 8 weeks. Fish with initial body weight 9.6 g were feeding with Coppens. Each treatment was assigned in triplicate. Results showed that in all treatments, survival rate were 100% and were not significantly affected by stocking density. However, growth and feed utilization parameters were significantly influenced by stocking density (P<0.05). Highest specific growth rate, feed efficiency and production were obtained with stocking density 25 fingerlings/dm 3 . Conclusion and application: P. obscura fingerlings are very tough. So, in order to improve production and technical/economical rentability in aquaculture, the optimum stocking density of P. obscura fingerlings is 25 alevins / dm 3 in reared conditions. Keywords: Parachanna obscura , stocking density, zootechnical performances, production