how do fishes breathe waters?

Question

how do fish breath not oxgien

Answer 1

Fish do breathe oxygen, but the oxygen (in most cases) is dissolved in the water. The way the breathing (or respiration) works is by using the mouth and covers over the gills (operculum) to move the water over the gills where the oxygen can be removed.

First the fish closes the gill covers and opens its mouth so water with dissolved oxygen can enter. Then the fish closes its mouth and the area around the inside of the mouth (called the buccal cavity) contracts as the gill covers oopen. This makes the water flow over and through the gills. Each gill looks like a comb with many long, thin projections - the skin here is very thin and the oxygen can be absorbed through the skin and into the blood. Here's a link with more info and pictures: http://www.kwic.com/~pagodavista/schoolhouse/species/fish/fishgill.htm

Some fish can breathe oxygen right from the air (bettas, gouramis, lungfish, some catfish). Other fish (freshwater eels) can breathe by absorbing some oxygen through their skin.

Answer 2

What really makes a fish different is the respiratory system. The water that surrounds a fish contains dissolved oxygen in a ratio of about 5 ml per liter. Therefore they must have a system that can extract that small amount of oxygen out of the water and into their bloodstream. They use their gills for this, which are found between the mouth and the beginning of the gut or food tract called the pharynx.

The process starts with the fish's mouth where he takes in water. When a fish opens and closes his mouth, he is pumping water back through the gills – his own way of breathing.

Answer 3

Actually, fish do breathe oxygen. inside the water there are tiny bubbles of oxygen. They fish take in the water and their gills separate the water from the oxygen bubbles.They keep the oxygen for them to live and "breathe" out the water.

Answer 4

Water containes oxygen. The gills on the fishes extract this oxygen from water and help them breathe.

Answer 5

H2O the O stands for oxygen. They absorb it through their gills. There is more oxygen in water than in the air we breathe. You may learn this when you get old enough to take a chemistry class. I'd work on your spelling for now, its horrible. See the square that says Check Spelling? Hit that occasionally and you won't look like a doofus.

Answer 6

They breathe dissolved oxygen in the water.


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Answer 7

They breathe the dissolved oxygen in the water, not the water.

Answer 8

They breathe with their gills.