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IMAGE: Graphs showing juvenile growth and smoltification frequency for red-spotted masu salmon in hatcheries and natural streams respectively. Fish in hatcheries can reach a large size and so have a high. view more
Credit: Tatsuya Tanaka
Researchers at the Kobe University Graduate School of Science have revealed that when captive-bred juvenile red-spotted masu salmon are released into natural streams, very few individuals become migrants.
Red-spotted masu salmon was an important fish species for the fishing industry in the rivers of west Japan, however in recent years their numbers are declining rapidly. The results of this research offer important suggestions for stocking practices and the management of river environments.