Freshwater

Salt concentration: low (< 0.05%)

Freshwater is found at streams, rivers, ponds and lakes, making up to 1% of earth's water bodies.

Some fish suited to freshwater:

• Angelfish (along with saltwater)
• Betta (fighting fish)
• Danios
• Goldfish
• Guppies
• Mollies
• Platys
• Swordtails
• Tetras

Brackish Water

Salt concentration: medium (0.05% - 3%)

Brackish water is the mixture of freshwater and saltwater, found at estuaries, where freshwater rivers meet the sea.

Some fish suited to brackish water:

• Pufferfish (along with saltwater)
• Archer fish
• Tigerfish
• Mono Sebae
• Scat fish

Saltwater

Salt concentration: high (> 3%)

Saltwater is the water in our oceans and seas, making up more than ⅔ of the earth’s surface

Some fish suited to saltwater:

• Angelfish (along with freshwater)
• Clownfish
• Gobies
• Eels
• Lionfish
• Pufferfish (along with brackish water)
• Rabbitfish
• Dottbacks
• Butterfly fish
• Cardinal fish
• Basslets
• Damsels
• Seahorses
• Tangs