Juvenile Snailfish Sets 8,336-Meter Fish Video Record, Testing an 8,200-Meter Survival Limit
Updated
Updated · spacedaily.com · Jul 28
Juvenile Snailfish Sets 8,336-Meter Fish Video Record, Testing an 8,200-Meter Survival Limit
3 articles · Updated · spacedaily.com · Jul 28
Summary
A baited camera in the Izu-Ogasawara Trench filmed a juvenile snailfish at 8,336 meters in August 2022, the deepest confirmed video record of any fish.
84 megapascals of pressure at that depth do not crush the fish like a submarine because its tissues match the surrounding water pressure and it lacks a gas-filled swim bladder.
TMAO, a molecule that helps stabilize proteins under extreme pressure, rises with depth in bony fish; a 2014 study projected fish would become isosmotic with seawater at about 8,200 meters.
That makes the 8,336-meter sighting notable but not fatal to the hypothesis: the estimate was extrapolated, the record fish was a solitary juvenile, and the deepest physically recovered fish were caught at 8,022 meters.
The finding reinforces a broader view that deep-ocean limits for fish are set less by body shape than by biochemistry—proteins, membranes and water balance—near the upper edge of the hadal zone.