Evaluation of alternative non-traditional lipid sources in diet for Thinlip grey mullet, Liza ramada fingerlings

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. & COPY; 2023 National Institute of Oceanography and Fisheries. Hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

The purpose of this trial was to evaluate the effects of substituting lipid sources on the growth, feed utilization, body biochemistry, blood constraints, and fatty acid profile of Thinlip grey mullet fingerlings. Four lipid sources were compared to fish oil as a basal diet, and the substitution showed a non-significant but notable influence on growth performance. Fingerlings nourished by poultry viscera oil had significant improvements in feed utilization, while those nourished by plant oil had lower body lipid contents. The fatty acid composition of the fish flesh reflected the dietary fatty acids, with higher levels of polyunsaturated fatty acids in fish fed fish oil.