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Volume: 2; Issue: 1, Jan-Feb, 2014
Effects of Dietary Lipid Sources on Growth and Survival of Mudfish Heterobranchus longifilis Fingerlings
Reginald Inodu Keremah and Tarila Terimokumo
Effects of four dietary lipid sources (cod liver oil, palm oil, soybean oil, and pork lard) on growth and survival of Heterobranchus longifilis fingerlings were evaluated. Each diet was prepared to contain 40% protein, other nutrients and a lipid source. Diets were tested on triplicate groups of 10 fish per plastic aquarium measuring 45x35x28cm3 with dechlorinated water. Fish were fed daily with 5% of their body weight for 49 days. Best growth (weight gain, specific growth rate and condition) results were obtained with soybean and palm oil diets, the least being cod liver oil. Pork lard diet produced intermediate performance. The feed conversion ratio was superior for soybean oil diet (0.58) compared to others (0.72-0.90). Protein efficiency ratio was similar in all experimental diets, 4.43± 0.74 (palm oil) – 4.98± 0.53 (soybean oil). Survival rates were high for all treatments (81.43±7.05-89.05±3.90%). Economic evaluation and performance of H. longifilis fingerlings suggest soybean oil (34.17/g weight gain) and palm oil (28.75/g. weight gain) diets to be of choice and cheaper to use as potential substitutes or cod liver oil in catfish feeds in this study.
Keywords: Heterobranchus longifilis, diet, lipid, growth, survival.