Abundance and some parameters of reproduction for pink salmon <i>Oncorhynchus gorbuscha</i> on Sakhalin coast of the Tatar Strait

Abstract

Annual data on biomass and number of pink salmon in catches, mainly landed from their feeding aggregations by trap nets, are presented for the Sakhalin coast of the Tatar Strait in 2003–2022. Number of the spawners entered to the rivers of this coast and number of the juveniles migrated downstream are assessed for some years. Dynamics of the pink salmon run to the rivers does not correlate with the dynamics of this species catch in the coastal waters that confirms the earlier conclusion about mixed origin of pink salmon in the feeding aggregations at the coast. The basis of pink salmon catches in recent years is the fish originated from the rivers of the adjacent mainland coast, whereas the stocks of pink salmon on the Sakhalin coast of the Tatar Strait are in depression caused by unfavorable environmental conditions of their spawning and embryonic development (as the spawning grounds erosion by extreme floods) and subsequent feeding of juveniles in the coastal waters (as heavy storms in the time of their migration from rivers).