Rainbow Trout / Niji Masu
Nijimasu [jp] / Raibow Trout
Oncorhynchus mykiss (Walbaum, 1792)
American strands of rainbow trout was first introduced to Japan in 1877 from the hatchery in Mounta Shasta, California. In 1880, already 20 thousands eggs were successfully hatched near Tokyo. However, Japan's Kryl Islands (under the dispute with Russia since the Soviet Invasion of 1945) next to Kamtschaka Peninsula is also original home of Asian rainbow trouts, thus this fish was destined to become Japan's popular fish. Today, the word masu or trout almost means rainbow trout. You can find rainbow trout in any game water nationwide.
Habitat of Native Run Fish
Native rainbow as steelhead is only available in the northern most island of Hokkaido. Where in the island of Honshu offering a river without a dam blocking its reproduction cycle of going back and fourth between cold stream and cold ocean, they flourish and some rivers in Aomori were known to be such water.
Wild Fish
Stocked Fish
Fishing Area
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