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The fish hasgills that they use to filter from the water the oxygen they need to as you say "breath" ,so when you put them on land there gills are not working anymore by filtering the water for oxygen because there is no water it's as you know just air (oxygen) so there gills are still trying to work but there is no water to filter oxygen for them.

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Fish have 'gills' which extract oxygen from water and so do not need lungs.

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15y ago
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Q: Why can't fish breathe on land?
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