How Do Fish Breathe Underwater?

When we go underwater, we have to fill our lungs with air in order to stay under the water. Whales and dolphins also have lungs and also have to resurface in order to spend any length of time under the water. Fish on the other hand don't have lungs and very rarely rise to the top of the water, so just how do they survive?

As you probably already know, fish have gills. The water around the fish produces a tiny amount of oxygen. In order for the fish to be able to stay under the water he needs to be able to take in oxygen. The fish's gills do just this. They filter the oxygen in the water and this enables the fish to be able to breathe in water.

If you take a fish out of the water, it will die of suffocation. This is because the oxygen in the air has not been filtered through its gills and the fish can't breathe it in properly.

When you find your goldfish lying dead on the top of its bowl, it has probably suffocated from a lack of oxygen because they oxygen has been used up by some other means such as bacteria. So always make sure you clean Jaws' bowl out regularly!

Fish breathe by their gills.

They breath oxygen through their gills! That is part of why Global Warming is SO IMPORTANT!
Water absorbs ANYTHING it comes in contact with!
And that means CO@! So some of the oceans are getting very high rates of CO2, and dangerous levels are starting to appear in a lot of places, too!
Plus this driving Ions down, and Ions are proportional to plant growth and plants breath CO2!
So soon the fish are going to have a hard time breathing!!!!  :) :)

Is it true that fish have to fill their lungs with air to go underwater

They have gills. Gills filter out the air from that water.

They breathe in through their mouths and out through their gills....

Gills man how do you not know that !!!!!!!!

Fish have gills so they can breathe underwater

They use there gills to breath underwater

Fishes have Gills on two sides of their heads. They take water through their mouth and take it out of their gills. These gills have the ability to absorb Ozygen from water