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stingray fish marine life underwater nature wildlife biology ocean sea animal aquatic environment ecosystem habitat marine naturel environment species ray elasmobranch chondrichthyes poecilothermic ectothermic cold-blooded cartilaginous fish marine biology marine conservation marine protected area marine reserve ocean conservation oceanography pelagic zone benthic zone neritic zone abyssal zone hadal zone continental shelf continental slope continental rise mid-ocean ridge seamount guyot atoll coral reef mangrove salt marsh tidal flat estuary lagoon bay gulf fjord strait channel sound passage narrows rapids waterfall dam reservoir lake pond river stream creek tributary confluence delta estuary lagoon bay gulf fjord strait channel sound passage narrows rapids waterfall dam reservoir lake pond river stream creek tributary confluence delta