FISH

FISHES

What are fish like?

-Fish are exclusively aquatic.

-Most of them have scales covering their bodies.

-They have fins to move under the water.

-They are ectothermics (their body temperature depends of their enviroment).

-They breathe through gills.

-They have lateral line sense organs. They detect vibrations.

-Most of them are carnivores, but they can be herbivores and omnivores.

-They reproduce sexually and they are oviparous.

THE MAIN TYPES OF FISH

There are 2 different types:

BONY FISH and CARTILAGINOUS fish.

There are 2 different types:

Bony fish and Cartilaginous fish.

BONY FISH:

-They have a bone skeleton.

-Gill protected by a hard covering called Opercullum.

-A mouth at the end or edge of their head.

-Homocercal tail fin (a tail fin divided into two equal parts.

-They have flat, round scales.

-They have a swim bladder.

CARTILAGINOUS FISH:

-They have a skeleton of cartilage.

-Gills without an opercullum.

-Ventral mouth.

-They have a heterocercal tail fin.

-They have thick, tooth like scales.

-They do not have a swim bladder.

BONY FISH

CARTILAGINOUS FISH