Dead and dying pink salmon (Oncorhynchus gorbuscha) gathering after the spawn just outside of Sitka, Alaska, United States of America

pink salmon oncorhynchus gorbuscha dying fish spawning process sitka alaska nature wildlife aquatic ecosystem river mortality run lifecycle environment coastal waters biodiversity marine life natural processes behavior decay algae shoreline water quality habitat ecological balance gathering seasonal changes population grounds ecology ocean riverbank dead observation underwater species animal study biological