A fish is any member of a paraphyletic group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits, though several fictional versions of fish, including American McGee's Alice's Snarks, are shown to have adapted legs.
Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups. Most fish are ectothermic ("cold-blooded"), allowing their body temperatures to vary as ambient temperatures change, though some of the large active swimmers like white shark and tuna can hold a higher core temperature. Fish are abundant in most bodies of water. They can be found in nearly all aquatic environments, from high mountain streams (e.g., char and gudgeon) to the abyssal and even hadal depths of the deepest oceans (e.g., gulpers and anglerfish). At 32,000 species, fish exhibit greater species diversity than any other group of vertebrates on Earth.
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- Abyssodon
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- Akami
- Albino Deepwater Bull Shark
- Alomomola
- Amazonia
- Amehoshi
- Ancient Fish Monster
- AncientMermaidmon
- Andre Marlin
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- Angler Mangler
- Angler Mozoo
- Anglerfish (ARK)
- Anglerfish Nezire
- Angolar
- Angoras
- Anorupatisu
- ANOTHER
- Aqua Slime
- Arctovish
- Arms Dealer Banjan
- Arrokuda
- Aruganosu
- Baiakuhe
- Bakun Sea Urchin
- Barakouzza
- Barboach
- Baron Shark
- Barracuda
- Barraskewda
- Basculegion
- Basculin
- Battleship Pufferfish
- Bazza
- Beotodus
- Big Bang Shark
- Big Cheep Cheep
- Big Fish
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- Black Demon
- Blipper
- Bloomp
- Blowkade
- Blurp
- Bobin
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- Boss Bass
- Boxfish Siren
- Brain Sucker
- Brankio
- Breo Swordfish
- Bruxish
- Bulbdog
- Buoyfish
- Butterflyeel
- Dam Shark
- Dancing Ninja Higenamazukin
- Deep Cheep
- Deep Dive Gill Grunt
- Deep Sea Dragonfish Alien
- Deep-Dweller
- Delisha Ennivel
- Demeran Yatmis
- Descom
- Devil Doggler
- Devil Fishing
- Diesel Basra
- Digon
- Dinicthoid
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- Doctor Fish
- Dondozo
- Dracovish
- Dreamgillas
- Drunk Shark
- Dumud
- Dunkleosteus (ARK)
- Dunkleosteus Jamato
- Dyrandoh