Adaptations (fishes have)...

Gills
Fins
Suction Cups
Siphon
Swim Bladder
Tenticles


Thick Skin
Claws
Shells


Camouflage: dual color (Shark), shape, decorate (Decorator Crab)




Ampullae of Lorenzini (dots on shark that help it feel 
temperature, magnetism, electricity of life)

Bioluminescence
Illicium (light from an Angler Fish)

Eyes (eye stalks, black vs. white vision and advanced)


Squirt water and/or guts (Sea Cucumber)
Inflate (Pufferfish)

Nematocysts (stinging Jellyfish)
Toxin
Ink (Sea Hare)

Yep, that's it!!