Question

why do fresh water fishes excrete dilute urine and marine fishes excrete concentrated urine?

Answer 1

Answer:

In Fresh water fishes:

Conc. of Environmental water < Conc. of the water in fish body fluids

So water moves into fish bodies by osmosis. Because of the large water intake, urine is dilute.

In Marine fishes:

Conc. of Environmental water > Conc. of the water in fish body fluids

So marine fishes tend to lose water to their surroundings because their bodies are less salty than the surrounding water.

Answer 2

Answer:

Freshwater fish have a higher salt concentration than their surroundings, which allows water to osmotically enter the fish. Their urine becomes diluted as a result of the significant water intake.

Marine fish lose water by osmosis because they have less salt in their bodies than the water around them. Their significant water loss makes their pee more concentrated.

Explanation:

Fish from freshwater:

The concentration of the water in fish body fluids > The concentration of Environmental water

Therefore, osmosis causes water to enter fish bodies. The enormous amount of water consumed has made urine diluted.

In fishes of the sea:

The concentration of Environmental water > The Concentration of the water in fish body fluids

Because their bodies are less saline than the surrounding water, marine fishes tend to lose water to it.

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