Effects of complete replacement of fish oil with plant oil mixtures and algal meal on growth performance and fatty acid composition in juvenile yellowtail Seriola quinqueradiata

• Published in: Fisheries science Vol. 86; no. 1; pp. 107 - 118
• Main Authors: Fukada, Haruhisa, Kitagima, Renato, Shinagawa, Junpei, Morino, Haruka, Masumoto, Toshiro
• Format: Journal Article
• Language: English
• Published: Tokyo Springer Japan 2020; Springer Nature B.V
• Subjects: Algae; Aquaculture; Biomedical and Life Sciences; Body weight; Canola oil; Carnivorous animals; Composition; Diet; Dietary supplements; Docosahexaenoic acid; Fatty acid composition; Fatty acids; Feed conversion efficiency; Feed efficiency; Feeding experiments; Fish; Fish & Wildlife Biology & Management; Fish oils; Food Science; Freshwater & Marine Ecology; Growth; Life Sciences; Lipids; Liver; Marine fish; Marine fishes; Oil; Oils & fats; Original Article; Palm oil; Physical growth; Pollachius pollachius; Pollack; Predators; Seriola quinqueradiata; Yellowtail; Yellowtail; Fish oil replacement; Fatty acid; Algal meal
• ISSN: 0919-9268; 1444-2906
• DOI: 10.1007/s12562-019-01361-9

Docosahexaenoic acid (DHA) is an essential fatty acid for marine carnivorous fish. Algal meal (AM), available as a new dietary DHA source, could completely replace dietary fish oil (FO). In this study, dietary FO was replaced with plant oil mixtures and AM in juvenile yellowtail Seriola quinqueradiata to investigate its effects on growth performance and fatty acid composition. The FO control diet was prepared with only pollack liver oil as the lipid source. For the non-FO diets, pollack liver oil was completely replaced with mixtures of canola oil and palm oil, with AM supplementation at 0% (AM0), 1% (AM1), 2% (AM2), 3% (AM3), and 4% (AM4). After completion of the 8-week feeding trial, the AM2 group showed significantly higher values for final body weight and feed efficiency than the AM0 group. No significant differences were observed in the other parameters of growth performance. Whole-body fatty acid composition reflected the dietary fatty acid composition in all dietary groups. These findings demonstrate that AM is useful as a DHA source in yellowtail aquaculture, thus contributing to a reduction in the use of FO in fish diets.