Question

why does a dead fish sink in water, while dead human float????​

Answer 1

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The fish fills his bladder by ingesting dissolved oxygen (DO). When it dives it expels the oxygen to reduce buoyancy. After the fish dies there is no more DO being ingested and the air in the bladder starts to dissipate, causing the fish to sink to the bottom.

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Answer 2

Answer:

Most fish are slightly denser than water, so sink immediately after death. However, like a drowned human, they become more buoyant over time as bacterial decomposition produces gases inside the body. Usually, enough gas builds up in body cavities to make the corpse float, like an inflated balloon.

See, when a dead body first enters the water, it does sink to the bottom. Water will eventually fill up the lungs, expel any excess air, and bring the corpse to the bottom. The reason that living human beings naturally float is because of the air in our lung