Comparison of adults return rates of hatchery-reared smolts originating from captive-brood and wild masu salmon
2010
Aoyama, T., Hokkaido. Fish Hatchery, Eniwa (Japan) | Omori, H. | Iijima, A. | Murakami, Y. | Izawa, T. | Urabe, H. | Miyakoshi, Y.
A total of 53,511 and 27,261 age-1 hatchery-reared smolts originating from first generation captive-brood and wild masu salmon (Oncorhynchus masou) were marked with a fin clip and released into the Ken-ichi River of southwestern Hokkaido in 2007. Some of them returned to the Ken-ichi River for spawning in 2008, and we estimated the number of fish using markrecapture. As the number of adult masu salmon from captive-brood and wild age-1 smolts was estimated to be 537+-103 and 746+-155 respectively, each return rate into the river was calculated as 1.00 and 2.74%.
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