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Tuna get oxygen through ram ventilation, which means that they swim rapidly in order to have water/oxygen move across their gills. If they stop swimming, they will suffoctate. Therefore, they need to swim even while they are sleeping!

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13y ago
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13y ago

When fish sleep the part of there brains that control motor functions stay awake which allows them to sleep while still move and allow water to flow through their gills to get oxygen. Also, fish regulate their depth with what is called a swim bladder that alters their depth, this also is controlled by the same part of the brain.

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14y ago

Yes they do. They sleep with their eyes open.

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Q: Why don't fish float to the top when sleeping?
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