In 2025, the number of flight hours for studying the main spawning grounds of Pacific salmon in the Chukotka Autonomous Okrug increased by 2 times compared to previous years. The intensity of research work in the region has increased, given that the study of aquatic biological resources in the eastern sector of the Arctic zone of Russia is an important strategic direction of the integrated approach to the conservation and rational use of regional ecosystems.
The survey area included: r. Velkilveem (basin of Lake Keipilgyn), the Pekulveem, Kannaut, Kavtayo, Rannatanmelgyn rivers (basin of Lake Pekulneyskoye), the Vaamychgyn river (basin of Lake Vaamychgyn). The length of the study area was 360 km. Also in the transit zone along the route, the right tributary of the Tumanskaya River (Meinylvegyrgyn) and the Gytgypokytkynvaam River - basin of Lake Mainits were surveyed.
The lake-river system of Maynypilgyno is located in the northern spurs of the Koryak Highlands. The morphology of the area under consideration is determined by the orographic features of the highlands. Since the water system is mainly fed by snow and rain, the hydrological regime is closely related to climatic conditions and, first of all, the amount of precipitation that provides groundwater feeding for the rivers. Relatively stable climatic conditions formed in the coastal region by the marine monsoon climate, as well as the geomorphological features of the river basin (mountainous terrain), contribute to the formation of spawning stations of Pacific salmon. The largest of them is the sockeye salmon population. In addition to sockeye salmon, chum salmon, pink salmon, and coho salmon spawn in the rivers flowing into the lakes.
The collected data are necessary for forecasting the approaches of Pacific salmon in future years.
Press service of VNIRO