Estimating rearing of ayu fish Plecoglossus altivelis fry from amount fed and feed efficiency
2019
Iwatani, H. (Fukui Prefectural Inland Water General Center, Fukui (Japan)) | Nemoto, S. | Nakajima, N. | Tominaga, O.
In seed production of ayu fish Plecoglossus altivelis, growing fry up is necessary for good survival after release. Efficient growth of fry in rearing tanks can reduce rearing costs. We calculated feeding efficiency as weight gained divided by amount fed in each of 46 rearing periods at our seed production site. Feeding efficiency was almost constant in fry of <3 g, and then became lower above that size. We also calculated feeding rate as total amount fed divided by total weight. Feeding efficiency tended to increase as feeding rate increased to 3.5%-4.5% and then decreased. These results will be useful in the efficient seed production of ayu fish at rearing sites.
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