Oncorhynchus masou (Cherry Salmon) is a salmonid fish native to Japan and Kamchatka, and the adjacent Northwest Pacific. This fish has a fluvattile (river-dwelling form), which resides in in streams, and anadromous form which migrates into the ocean, and returns to freshwater to spawn. Adults reach 790 mm (Froese and Pauly 2024). This a popular food and sport-fish in Japan, but only two introductions are reported in the United States. In 1929, this fish was released into the North Branch of the Boyne River in Charlevoix County, a tributary of Lake Michigan. In 1974, it was released into the Deschutes River, near Olympia Washington, flowing into Puget Sound. Both introductions were unsuccessful (US Geological Survey Nonindigenous Species Database 2024). There was also an introduction in Algonquin Provincial Park, Ontario, again without establishment (Christie, W.J. 1970. Introduction of the cherry salmon Oncorhynchus masou in Algonquin Park, Ontario. Copeia 1970(2):378-379).