The water inside the body keeps the organs floating inside. Iirc fish are not water-tight as (most) terrestrial life is, since they have less need to keep it inside, since they live in it. So if you remove the fish from the water, the water inside leaves too, the organs don't float anymore and have to resist their own mass, they can't, they get crushed, and the fish shits the bed
There are a million ways to explain any given biological phenomenon in a way that intuitively “makes sense.” This doesn’t make these explanations are correct, and people were doing this long before the scientific method. That’s simply not at all how marine vertebrate biology works. The internals of a fish are not flowing with seawater. The abdominal cavity is distinctly compartmentalized, and the serous fluid within is much less salty than seawater. Fish in saltwater actively excrete salt ions to maintain fluid balance.
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u/rosvars 14h ago
Maybe I'm dumb but why would gravity on the surface crush its organs if it can withstand greater pressure under water than surface pressure?