| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
We investigated the effects of olive leaf (OL) powder supplemented to fish feed on muscle of cultured fish yellowtail. Fish reared with feed containing OL powder (OLP-diet fish) had more elastic muscle than fish with control diet (Ct fish). Microstructure observation of muscles showed that OLP-diet fish has more rigid endomysium structure than Ct fish. Furthermore, ordinary muscle of OLP-diet fish had higher collagen content than that of Ct fish. Similar result was obtained in another cultured fish red sea bream. Fibroblast cell treated with OL polyphenol (PP) caused the increase in collagen amount. Since collagen fiber in endomysium is responsible for the texture of muscle, feeding OL to cultured fish will make the texture of muscle harder. The present study suggests that OL powder is useful feed additive to enhance texture of cultured fish muscle through strengthening collagen structure in muscle.
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