Fishes are vertebrate species.

They all live in water.

Fish area is more in tropical area.

They are tiny to massive in size.

They have been living in water for more than 500 million years, coelacanth which is known the ancient fish.

 Fishes breathe through gills.

Fins help them in their movement in the water.

Fishes are the only vertebrates with true fins.

Some are hermaphrodite (possessing both sex organs - California Sheephead)

There are 62 orders.

 There are more than 25,000 species.