Example of Animals Breathing Through Gills

Just as there are animals that breathe through the skin and lungs, there are also animals that breathe through gills, which allow them to obtain oxygen from the water.
These gills They are what distinguish aquatic animals, especially mollusks, annelids, crustaceans, echinoderms and fish.
Oxygen is transported by the body through the circulatory system, which is transformed by organs that bear the name of gills.
The gills, transform gases, (oxygen) transporting it through the circulatory system, so that the cells of the fish's body perform their functions, Oxygen, the residue that is CO2, is expelled through the mouth of the fish, and it is this that produces the bubbles that we sometimes see come out of the fishes.
The gills are organs that are outside the body of the fish, that is, they are not like the lungs that are inside the body, the gills are located outside the body in the head section of the fish, because they need to be in contact with the Water.

Examples of animals that breathe through gills:

Shark
Tuna
Striped blanket
Cod
Velugo
Sturgeon
Catfish
Crabs
Lobsters
Shrimp
Stone fish.
Hedgehogs
Octopus
Blowfish
Hammerhead shark
Sword shark
Tintoreras
There are also animals with gills that live in fresh waterThese are the ones that are generally taken as pets and are usually river animals; among these we can list the following:
Large tent
Mojarra tilapia
Guppy fish
Lion fish
Charales
Angel fish
Wrestling weights
Japanese fish
Rainbow Fish
Piranhas
Blowfish
It is necessary to clearly distinguish the existence of marine animals that have lungs, such as whales, dolphins and turtles, among others.