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fish yellow blue ocean sea animal marine underwater nature wildlife biology zoology ichthyology aquatic finned gilled scaly vertebrate cold-blooded ectothermic poikilothermic heterothermic homeothermic endothermic mesothermic bradymetabolic tachymetabolic thermoneutral eurythermal stenothermal osmoregulatory stenohaline euryhaline diadromous catadromous anadromous amphidromous potamodromous oceanodromous thalassodromous limnodromous benthopelagic epipelagic mesopelagic bathypelagic abyssopelagic hadalpelagic neritic oceanic pelagic littoral sublittoral bathyal abyssal hadal continental slope rise seamount guyot bank shoal reef atoll lagoon estuary mangrove salt marsh tidal flat mudflat sandflat beach dune headland promontory cape peninsula island archipelago continent