Evaluation of Carrying Capacity of Pacific Salmon in the North Pacific Ocean for Ecosystem-Based Sustainable Conservation Management

摘要

The change in biomass of Pacific salmon (Oncorhynchus spp.) indicates a 30- or 40-year periodicity in the North Pacific Ocean coinciding with long-term climate conditions. 1 estimated the carrying capacity (K) of sockeye (O. nerka), chum (O. ketd), and pink salmon (O. gorbuscha) in the North Pacific Ocean using the replacement level of the Ricker's recruitment curve, and defined residual carrying capacity (RCC):rnRCC = (Carrying capacity - Biomass) / (Carrying capacity) × 100rnA significant positive correlation between the Aleutian low pressure index (ALPI) and the carrying capacity was observed at the species level. Factors affecting carrying capacity at the population level, such as reproductive regimes (e.g. survival rate and sea surface temperature (SST) in the early marine life period and hatchery technology), differed by population in Hokkaido chum salmon.