Effect of Dietary Palm Oil and Medium Chain Triglycerides on Growth and Fatty Acid Profiles of Japanese Catfish <I>Silurus asotus</I> Juveniles

Roslianah Asdari, Amal Biswas, Yamamoto Shinichi, Araki Hideo, Kawashima Ken, Roshada Hashim, Takii Kenji

doi:10.11233/aquaculturesci.62.45

Three isonitrogenous, isolipidic and isoenergetic diets were formulated; a fish oil-based diet used as control and two test diets, consisted of either palm oil as sole lipid source (PO) or a combination of palm oil and medium chain triglyceride (MCT) at 8:2 ratio. Twenty Japanese catfish of mean weight 7.3 g stocked into nine 100 l circular tanks and fed up to apparent satiation, twice daily for 8 weeks. At the end, there was no significant difference in final body weight; thus suggests palm oil or medium chain triglyceride can replace fish oil in the diet for Japanese catfish. Supplementing medium chain triglyceride in the diet does not necessarily improve growth performance or increase protein retention of Japanese catfish. In general, fatty acid composition in muscle and liver of Japanese catfish reflect their respective diets. C22:6n-3 (DHA) were deposited in the muscle and liver of fish although fish are fed with PO and MCT diets. DHA in these groups may come from residual DHA from fishmeal in the diets, possibility of selective deposition of HUFA by Japanese catfish or sparing effect by other fatty acids. There is also possibility of bioconversion of C20:4n-6 from C18:2n-6 through elongation and desaturation activity.

Effect of Dietary Palm Oil and Medium Chain Triglycerides on Growth and Fatty Acid Profiles of Japanese Catfish <I>Silurus asotus</I> Juveniles

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