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What Is a Fish?

Fishes come in an amazing variety of shapes and colors, but they all have three important things in common: All fishes live in water, have fins, and use gills to get oxygen from the water. We have also included a few sea creatures -- some jellyfish and octopods -- in this category.

• Nesting and Reproduction
• Defense
• Senses

Name	Type
American Eel	Freshwater Fish
American Shad	Freshwater Fish
Bluegill	Freshwater Fish
Brook Trout	Freshwater Fish
Brown Bullhead	Freshwater Fish
Brown Trout	Freshwater Fish
Burbot	Freshwater Fish
Colorado Squawfish	Freshwater Fish
Common Carp	Freshwater Fish
Gizzard Shad	Freshwater Fish
Goldfish	Freshwater Fish
Grass Carp	Freshwater Fish
Largemouth Bass	Freshwater Fish
Longnose Gar	Freshwater Fish
Mottled Sculpin	Freshwater Fish
Northern Pike	Freshwater Fish
Pumpkinseed	Freshwater Fish
Rainbow Trout	Freshwater Fish
Smallmouth Bass	Freshwater Fish
Snail Darter	Freshwater Fish
White Sucker	Freshwater Fish
Yellow Perch	Freshwater Fish
Atlantic Cod	Saltwater Fish
Atlantic Flyingfish	Saltwater Fish
Atlantic Halibut	Saltwater Fish
Atlantic Mackerel	Saltwater Fish
Atlantic Salmon	Saltwater Fish
Atlantic Sturgeon	Saltwater Fish
Blue Tang	Saltwater Fish
Cabezon	Saltwater Fish
California Grunion	Saltwater Fish
Coho Salmon	Saltwater Fish
Crevalle Jack	Saltwater Fish
Foureye Butterflyfish	Saltwater Fish
Garibaldi	Saltwater Fish
Goosefish	Saltwater Fish
Great Barracuda	Saltwater Fish
Hogchoker	Saltwater Fish
Lined Seahorse	Saltwater Fish
Northern Pipefish	Saltwater Fish
Porkfish	Saltwater Fish
Queen Angelfish	Saltwater Fish
Queen Parrotfish	Saltwater Fish
Red Grouper	Saltwater Fish
Sailfish	Saltwater Fish
Sea Lamprey	Saltwater Fish
Sea Raven	Saltwater Fish
Sergeant Major	Saltwater Fish
Sheepshead Porgy	Saltwater Fish
Stoplight Parrotfish	Saltwater Fish
Striped Bass	Saltwater Fish
Tarpon	Saltwater Fish
Tautog	Saltwater Fish
Yellowfin Tuna	Saltwater Fish
Yellowtail Snapper	Saltwater Fish
Basking Shark	Sharks and Rays
Clearnose Skate	Sharks and Rays
Great White Shark	Sharks and Rays
Manta	Sharks and Rays
Nurse Shark	Sharks and Rays
Scalloped Hammerhead	Sharks and Rays
Shortfin Mako Shark	Sharks and Rays
Spiny Dogfish	Sharks and Rays
Tiger Shark	Sharks and Rays
Whale Shark	Sharks and Rays
Common Atlantic Octopus	Sea Creatures
Giant Pacific Octopus	Sea Creatures
Lion's Mane	Sea Creatures
Moon Jellyfish	Sea Creatures
Portuguese Man-of-War	Sea Creatures
Sea Gooseberry	Sea Creatures
Two-spotted Octopus	Sea Creatures

Most fish... live in water all their lives breathe oxygen from water through special organs called gills have fins and scales are cold-blooded give birth to babies hatched from eggs

These apply to almost all fish. However, there are some exceptions. Some fish have no scales at all.

There are also some that give birth to babies from eggs that hatch inside the mother's body.

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