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The principal purpose of the present trial is to inspect the complete supply of nutritional fish oil by substituting lipid springs in an applied feed for Thinlip grey-mullet, Liza ramada fingerlings. The impacts of four lipid sources (fish viscera oil (FVO), poultry viscera oil (PVO), tallow oil (TO), and plant oil (PO)) compared with fish oil (FO) as a basal diet on performance growth rates, feed-utilization, biochemical structure of the body, specific blood constraints, and fatty acid profile were evaluated in Thinlip grey mullet fingerlings. The substitution of FO by four substitute lipids shows a non-significant but notable influence on growth performance. On the other hand, feed utilization productivity was significant for fingerlings nourished by the PVO diet. Fingerlings nourished by the PO diet showed significantly lower contents of the total body lipid compared to fingerlings nourished by other diets. Flesh fatty acid structure reflected dietary fatty acids composition. Higher polyunsaturated fatty acids (PUFAs) were detected in fingerlings' flesh nourished by FO, while lower contents were dedicated in fingerlings' flesh nourished by PO. Although saturated fatty acid (SAF) contents in fingerlings' flesh nourished by diet TO were greater than other treatments, these results are beneficial in nutritional design to decrease feed prices without compromising Thinlip grey mullet fingerlings growth. [ABSTRACT FROM AUTHOR]