How much water a fish consumes really depends on how much salt is in its surrounding habitat. While fish do drink some water — salty or fresh, depending on their surroundings — through their mouths, they mostly absorb it through their skin and gills via osmosis.
“You’ve got to think of a fish as sort of a leaky boat in the water,” Tim Grabowski, a marine biologist at the University of Hawaii, told Live Science. “You constantly have a movement of either water or the salts that are in the water between the fish’s body and the external environment.”
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