Dietary protein requirement of triploid Heterobranchus longifilis fingerlings fed formulated diets

Abstract

Artificially bred triploid fingerlings of Heterobranchus longifilis (9.9 + 2.25) were fed 5% body weight with four different formulated diets (35, 40, 45 and 50% crude protein) for 56 days. Data taken include weight gain, average daily weight gain., specific growth rate and food conversion ratio. Weight gain increased as the dietary protein level increases but no significant differences (P > 0.05) occurred between the various treatments. The survival of fish was not affected by dietary protein levels. Treatments fed with 35 and 40% crude protein diets gave low performance. The best growth performance was obtained in treatment fed with 45% crude protein.


Key words: Heterobranchus longifilis, Triploid, Crude protein requirement.


Journal of Aquatic Sciences Vol.17(1) 2002: 1-4