Egg-to-fry survival of masu salmon planted in artificial spawning redds
2020
Miyakoshi, Y. (Fisheries Research Department, Hokkaido Research Organization, Yoichi, Hokkaido (Japan)) | Takeuchi, K. | Aoyama, T. | Nagata, M.
Embryo planting in artificial spawning redds has been examined as a cost-effective means for enhancement of salmon. To evaluate effectiveness, eyed masu salmon Oncorhynchus masou masou eggs were experimentally planted in artificial redds, and egg-to-fry survival was surveyed in six tributaries of the Ishikari River in 1999 and 2000. The egg-to-fry survival rates were 0-11.9 % in the five of the study rivers, while it was 49.4 % in the final river. Clear relationships were not observed between stream conditions, e.g. gravel composition, stream width, and egg-to-fry survivals.
显示更多 [+] 显示较少 [-]