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S chizochytrium as a replacement for fish oil in a fishmeal free diet for jade perch, S cortum barcoo ( M cCulloch & W aite)
Author(s) -
Van Hoestenberghe Stijn,
Fransman CharlesAimé,
Luyten Tom,
Vermeulen Daniel,
Roelants Ivo,
Buysens Saskia,
Goddeeris Bruno M.
Publication year - 2016
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12631
Subject(s) - food science , biology , fish oil , fish meal , flesh , perch , linseed oil , polyunsaturated fatty acid , zoology , fatty acid , biochemistry , fish <actinopterygii> , fishery
A 10‐week trial was conducted to determine the response of juvenile jade perch S cortum barcoo on the replacement of dietary fish oil ( FO ) in a fishmeal free diet. Three iso‐nitrogenous, isocaloric and isolipidic diets were formulated, each containing a different primary fat source: FO , linseed oil ( LO ), and a mixture of S chizochytrium and LO . The substitution of FO with the mixture of S chizochytrium and LO did not cause a difference in growth. However, there was an 8% reduction in weight gain in fish fed dietary LO , indicating that juvenile jade perch do require a minimal concentration of dietary n‐3 highly unsaturated fatty acids ( HUFA ). Fish fed the S chizochytrium diet stored more efficient n‐3 HUFA and in particular DHA in their flesh, and retained a higher fillet recovery compared to fish fed FO . In addition, we demonstrated that jade perch are able to produce both n‐3 HUFA and n‐6 HUFA when dietary PUFA are present. Fish fed the LO diet for 10 weeks contained the lowest amount of n‐3 HUFA in fillets among dietary treatment groups. However, feeding these fish the S chizochytrium diet for an additional 4 weeks increased the n‐3 HUFA content towards the same concentration of n‐3 HUFA found in the flesh of fish fed FO , without affecting the sensory properties of the fillets. In contrary, feeding the S chizochytrium diet for a continuous period of 14 weeks lowered overall sensory property scores.