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Freshwater fishes drink very little water and take in little water with their food. Marine fishes must conserve water, and therefore their kidneys excrete little water. To maintain their water balance, marine fishes drink large quantities of seawater, retaining most of the water and excreting the salt.

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Issac.evaro

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2y ago
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12y ago

The differences in water balance between freshwater and salt water fish are due to one main thing. salt

in a Marine fish it has a abundance of salt water around it so by drinking the water it gains more salt than a fresh water fish would, however to keep from dieing of a excess of salts it excretes in in concentrated urine and feces.

a fresh water fish has the opposite problem he has alot of water around him but little salt so to keep his water level down he constantly excretes a diluted urine to lose water and keep in the salt.

this has been a bit of a rushed explination but it is the basics of water balance between fresh water and marine fish

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Q: Why is maintaining water balance within the body a different process for freshwater fish than for marine fish?
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