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food fish eel freshwater animal wildlife nature underwater river stream lake pond wetland habitat environment ecosystem conservation protection endangered threatened species biology zoology ichthyology anatomy physiology behavior ecology evolution adaptation food chain web trophic level predator prey competition symbiosis parasitism disease infection treatment cure research science discovery knowledge learning education school university museum library laboratory field trip adventure travel exploration discovery experience memory life death nature animal eel fish food freshwater wildlife underwater river stream lake pond wetland habitat environment ecosystem conservation protection endangered threatened species biology zoology ichthyology anatomy physiology behavior ecology evolution adaptation food chain web trophic level predator prey competition symbiosis parasitism disease infection treatment cure research science discovery knowledge learning education school university museum library laboratory field trip adventure travel exploration discovery experience memory life death