Salmon have gills that are more permeable to | vedclass

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(B) Salmon are euryhaline fish that migrate between fresh water and salt water. Fresh water is hypotonic to the fish's body fluids,meaning water tends

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(B) Salmon are euryhaline fish that migrate between fresh water and salt water. Fresh water is hypotonic to the fish's body fluids,meaning water tends to enter the body via osmosis through the gills. Ocean water is hypertonic to the fish's body fluids. When the salmon moves from fresh water to the ocean,the external environment changes from a lower solute concentration to a higher solute concentration. Because the gills are permeable to water,the osmotic gradient now favors the movement of water out of the body rather than into it. Therefore,the rate of water uptake into the body through the gills decreases significantly as the fish enters the hypertonic marine environment.

Salmon have gills that are more permeable to water than to salts. Salmon hatch in fresh water streams and then migrate to the ocean. Once they reach the ocean,you would expect the rate of uptake of water into their body through the gills to:

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