What's The Deepest A Fish Can Swim? Researchers Reveal Chemical In Cells Sets Threshold

By Jacqueline Howard

Ocean-going fish can’t live any deeper than 8200 meters, according to a new study. All fish have their limits—you’ll never find sharks below 4 kilometers, for example—but why there aren’t any fish at all below 8 kilometers remains a mystery.

Now, a team of biologists say the threshold is set by two competing effects of trimethylamine N-oxide (TMAO), a chemical in fish cells that prevents proteins from collapsing under high pressure.

While fish should need more and more TMAO to survive ever greater depths, higher concentrations of the compound also draw in more and more seawater through osmosis, the process by …read more

Source: Huffington Post Green

    

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