Optimal dietary lipid level for the growth of tire track eel (mastacembelus favus) fingerling

Tóm tắt

A growth experiment was conducted to determine the optimal dietary lipid level of tire track eel (Mastacembelus favus) fingerlings. Five iso-energetic 20 kJ/g and iso-nitrogenous 43% purified diets containing 1.5% - 13.5% lipid (squid oil/vegetable oil) in 3% increments were fed for 90 days to triplicate groups of tire track eel in a recirculated filtered rearing system. The results showed that weight gains were higher in the fish fed the 7.5% and 13.5% lipid diets, followed by the 4.5% lipid diet and lowest in fish fed the 1.5% lipid diet. Protein efficiency ratio (PER) in fish generally showed the same pattern of weight gains. Feed conversion ratios (FCR) were better (P < 0.05) for fish fed the lipid diets over 7.5% lipid than those fed 4.5% and 1.5% lipid diets. Body lipid content was highest (P < 0.05) in fish fed the 13.5% lipid diet, followed by those fed the 10.5% and 7.5% lipid diets, and lowest in fish fed the 4.5% and 1.5% lipid diets. The trend of the body indices was not definite regarding to dietary lipid content.  Second-order regression of weight gains on concentrations of dietary lipid containing 43% protein indicated that the optimal dietary lipid level resulting in maximal growth of tire track eel fingerling was about 8.5%. Based on the results, 7.5% of dietary lipid containing 43% protein appears to meet the minimal requirement for this species.

Từ khóa: Lipid requirement for tire track eel

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