The elusive ito, also referred to as Sakhalin taimen, is a significant freshwater fish in Japan and a member of the salmon family. Its breeding grounds are primarily located in the northernmost main island of Hokkaido and the Northern Territories, with only a limited number of rivers confirmed for their successful breeding. The International Union for Conservation of Nature and Natural Resources (IUCN) Red List of Threatened Species classifies the ito as "critically endangered," emphasizing the urgent need for conservation efforts to ensure its survival in the wild.
In eastern Hokkaido, the month of April marks the spawning season for these majestic phantom fish. However, recent construction activities by the local government upstream have led to excessive sedimentation in the spawning area, threatening the survival of the fry. Despite these challenges, a reporter from Asahi Shimbun had a rare opportunity to witness an intense battle between two male ito, each measuring over 1 meter in length and displaying vibrant red hues on their bodies, as they competed for the attention of a female during the spawning season.
The reporter observed the fierce competition unfold in shallow waters, where one male fiercely defended its territory against a rival male approaching to compete for the female's favor. The battle between the two males, with bodies mostly exposed to the air, lasted for several dozen seconds, showcasing the intensity and determination of these creatures during their reproductive rituals. Amidst the dramatic confrontation, the surrounding shore bloomed with yellow fuchsia flowers, known as chiraiapappo by the indigenous Ainu people, adding a touch of natural beauty to the scene.