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Freshwater fish tend to gain water.
The cells gain water.
The cells gain water.
The density and pressure of saltwater is different from freshwater as is much of the bacterias and parasites. The acidity of the water is also of concern as the lower the PH the higher the acidity of the water. Saltwater being of a higher PH would not handle the lower PH of freshwater very well. Also if moving a freshwater fish to saltwater that fish will lose a great amount of water in it's body causing death and if the saltwater fish is moved to freshwater it will gain great amounts of water causing death.
gain of water through food
Depending on if the fish lives in fresh or salty water they may urinate a lot (if they live in freshwater) or living in a salty environment can make them pee less but it's very concentrated.
The cells of the saltwater fish would gain too much water.
Salt controls water absorption so the cells would gain water.
Salt controls water absorption so the cells would gain water.
All fish live in water, this may sound gross but fish drink there own water. water
Blood wastes are filtered by the kidneys. Saltwater fish lose water because of osmosis. Their kidneys return water to the body. The reverse happens in freshwater fish: they to gain water osmotically. Their kidneys produce dilute urine for excretion.
Salt controls water absorption so the cells would gain water.