Effect of giant jellyfish Nemopilema nomurai as supplemental feed on threadsail filefish Stephanolepis cirrhifer
2015
Miyajima-Taga, Y. (Kyoto University, Maizuru, Kyoto (Japan). Maizuru Fisheries Research Station) | Masuda, R. | Kurihara, A. | Yamashita, Y. | Takeuchi, T.
We conducted a 30-day feeding experiment on threadsail filefish Stephanolepis cirrhifer to evaluate the efficacy of giant jellyfish Nemopilema nomurai on the growth and body composition of the filefish. Four treatments were prepared: starved (control, S), fed only jellyfish (J), fed only pellets (control, P), and fed both jellyfish and pellets (JP). Threadsail filefish consumed the giant jellyfish as much as 5.6 and 4.1 times their own body weight per day in the J and JP treatments, respectively. Fish in the S treatment had 68% mortality, whereas the J treatment had no mortality. Fish in the JP treatments showed significantly faster growth than those in the P treatment. The giant jellyfish contained a high ratio of n-6 highly unsaturated fatty acids, especially arachidonic acid as well as free amino acids, especially taurine. The high contents of these acids reflected those of fish body composition. These results showed that feeding giant jellyfish for threadsail filefish improved their growth and body composition, and we therefore recommend the use of jellyfish as supplemental feed for stock enhancement or aquaculture.
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