Hucho perryi), also known as the Japanese huchen or stringfish (Japanese: 伊富/イトウ, romanized: itō), is a large species of salmonid freshwater fish in Northeast Asia, found in the lakes and large rivers of Primorsky, Khabarovsk, Sakhalin and Kuril Islands of Far Eastern Russia, as well as Hokkaido of Japan.

[3][4][5][6] The population has been in general decline for a century at least, with contributory factors including degradation of the environment by logging, oil exploration and change of land use to agriculture.

[1] Parahucho perryi is one of largest, most ancient salmon species and primarily inhabits the lower to middle reaches of lakes and rivers.

The loss of more than 50% of their original habitat due to agriculture, urbanization, and more recently, oil and gas development, is a major factor.

Since 2006, the IUCN has listed Parahucho perryi as critically endangered based on the assessment completed by the Salmonid Specialist Group.