Assessment of the Growth Performance and Feed Utilization of Fingerling Heterobranchus longifilis Fed Raw and Boiled Jackbean (Canavalia ensiformis) Seed Meal as Fishmeal Substitute

摘要

Fingerlings of Heterobranchus longifils were fed thirteen isonitrogenous (CP30%) and isocaloric (ME 2900 Kcal kg 1) diets formulated by substituting fishmeal with raw or 60 min. boiled Jack Bean Seed Meal (JBSM). After 56 days of feeding at 3% body weight, the specific growth rate SGR and apparent protein efficiency ratio APER values at 10% raw JBSM substitution and up to 40% boiled JBSM substitution were not significantly different from the controlled diet. The apparent feed conversion ratio AFCR for all the diets except 100% JBSM substituted diets were statistically similar. The fish carcass protein significantly decreased with increasing JBSM substitution. Similarly the carcass fat values for fish fed boiled JBSM substituted diets decreased significantly with increasing substitution while those fed raw JBSM substituted diets showed no trend. It is therefore concluded that raw and boiled JBSM could be successfully used to substitute fishmeal at 10 and 40% levels respectively in diets for Heterobranchus longifilis