Results of expeditionary work on the Northern Kuril Islands to monitor the approaches of Pacific salmon and collect biostatistical indicators in summer 2025

Abstract

The purpose to present data obtained during monitoring of four species: sockeye salmon, pink salmon, chum salmon, coho salmon approaches to Paramushir Island in the Northern Kuril Islands in 2025. Methods used: material collection and biological analysis were carried out using generally accepted methods. The research material for biological analysis was collected at the bases of the fish processing companies LLC «Alaid» and JSK «North Kuril Seiner Fleet Base». Results: the approaches of Pacific salmon during pre-spawning migration off the coast of Paramushir Island were not numerous. Pink salmon accounted — for 34.7% of the total catch in the North Kuril zone in 2025, chum salmon for 29.2%, and sockeye salmon — for 28.2%. Coho salmon accounted for the lowest share at 7.9%. A biological analysis of 896 Pacific salmon specimens was conducted, and the age of 579 specimens was determined. Innovations: up-to-date data on the ratio of species diversity in Pacific salmon runs, as well as their biological characteristics in 2025, were obtained. Practical significance: the obtained results will form the basis for developing materials for projected Pacific salmon harvest (catch) volumes in the northern Kuril Islands.