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

dead salmon dying salmon pink salmon oncorhynchus gorbuscha salmon spawning sitka southeast alaska north america wild fish river ecosystem aquatic life natural habitat fish gathering spawning season coastal waters fish mortality wildlife observation biological processes freshwater fish salmon run underwater scene environmental changes ecological balance marine biology fish behavior species migration habitat loss fishing region seasonal patterns alaskan wildlife salmon population ecological health fish ecology endangered species fish diversity nature conservation river life ecosystem dynamics salmon habitat spawning grounds wildlife conservation aquatic ecosystems biodiversity restoration ecology fish conservation salmon biology natural resources wildlife management salmon lifecycle habitat preservation