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fish food animal eel wildlife nature underwater river stream lake pond wetland habitat conservation threatened endangered species protection biology marine aquatic ecosystem foodchain predator prey scales skin slimy smooth long body tail head eyes mouth teeth fins dorsal pectoral pelvic anal lateral line vertebrae skeleton muscle flesh bone blood gills heart liver kidney stomach intestine reproductive system nervous system sensory system immune system endocrine system circulatory system respiratory system digestive system excretory system integumentary system adaptation evolution behavior communication social interaction reproduction growth development life cycle habitat distribution range migration population abundance trends threats conservation status fishing hunting trapping bycatch pollution climate change invasive species disease parasite predator prey human impact research education awareness protection management sustainable use conservation