this section discusses sustainable conservation based on the ecosystem approach as a new paradigm for risk management in fisheries a significant positive correlation was observed between the aleutian low pressure index alpi and carrying capacity at the species level residual carrying capacity was significantly positively correlated with body size and negatively related to age at maturity in chum salmon o keta as an example of a densitydependent effect kaeriyama on the other hand the biomass of wild chum salmon populations in the s decreased to per cent of s levels despite a significant increase in hatchery populations figure