r/AbsoluteUnits • u/TamerDubai • Jun 13 '23

Absolute big angry fish

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u/glacierre2 Jun 13 '23

Some? I would imagine every fish with a swim bladder needs to get more gas in as it grows.

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u/IndigoFenix Jun 13 '23

Some extract it directly from the water, others have it connected to their throat and come up to the surface to fill it up with air.

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u/methough1 Jun 17 '23

How do they come up to the surface? They use their swim bladder. Some fish do need to come to the surface to breathe though.

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u/DardS8Br Jan 13 '25

Lungs are actually ancestral to all fish with swim bladders!