Abstract
Summary This study was designed to evaluate the effect of diets containing different levels of fish meal (FM) and tuna liver meal (TLM) on the growth performance and fatty acid profiles of Nile tilapia fry, Oreochromis niloticus (initial mean weight: 2.29±0.07 g fish -1 ). Each diet replacing 0, 10, 20, 30, 40, and 50% FM by TLM was randomly allocated to triplicate groups of fish in aquaria for 13 weeks. Results demonstrated that final weight, specific growth rate and protein efficiency ratio of fish fed diets replaced up to 30% TLM were not significantly (P>0.05) different from fish fed the control diet, except for TLM levels of ≥40. There were no significant differences in protein and ash contents in whole-body, while dry matter and lipid contents were significantly affected (P 0.05) between experimental groups. Furthermore, the increase of dietary TLM did not significantly affect the n-3: n-6 ratio in fish flesh.
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