they dont. Oxygen in the water through there gills
from their gills
Water is to fish - as air is to animal.
puffer fish
Fish get their air from the water, their gills separate water form air.
fish need air because they won't be able to breath if they didn't have air, and fish need air badly because they spend most time in the water. fish need air as much as we do.
There is a large number of different types of fish that have air sacs and can gulp air. These fish species are referred to as "labryinth". The by far most popular Labryinth fish is The betta Splendid or Betta fish.
no, they have a swim bladder but this is so the fish can stay afloat
because fish need it to breathe. just like humans need air to breate. to fish, water is air.
They do breathe air.
A betta does not breathe air all the time, it is a fish with gills that lives in water, and it certainly looks like a fish. However, they do need to have an air space at the top of an aquarium and can survive in a wet tissue. They are fascinating fish, but they are definitely fish.
No reptiles are air breathing, cold blooded, egg laying animals. Fish are not air breathing.
If the fish has a back bone then it is considered as a bony fish :)
Their is an air chamber in most fishes just like in submarines. When it gets filled with air the fish moves up. While, when air is released the fish moves down. This is precisely what happens in a submarine.