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Why do fish open and close their mouth if they breath with their gills?

if a fish breathes with its gills, why does it open it's mouth as if it's breathing?

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I respect the answers above me, but i wanna give you the genuine reason why fish open their mouth in the water. This is common for some fish to do as a type of breathing. A fish that does this naturally will look calm and open the mouth in a similar repeat fashion.

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Can you rephrase it?
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Most fish will open and close their mouths mostly because they are sucking up micro algae
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to eat :|

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To let the water go out maybe?

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bradahh

Opening their mouths and detracting their tongue is how they suck in water to pass over their gills.

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Ok
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Fish open their mouths to pull in water which passes through to the gills to breath with. The mouth is a pump for water.

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