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fish marine life ocean seafood nature animal underwater wildlife biology food healthy protein omega-3 DHA EPA nutrition diet health sustainable fishery commercial fishing overfishing conservation marine conservation ocean conservation biodiversity ecosystem habitat species population threatened species endangered species extinction climate change global warming pollution plastic pollution ocean acidification coral bleaching habitat loss overpopulation human impact environmental impact food chain food web trophic level predator prey symbiosis mutualism commensalism parasitism competition adaptation evolution natural selection survival of the fittest the circle of life