What would happen if a freshwater fish did not produce lots of watery urine

     The right answer to this question is: Water would come out of the fish by a process called osmosis.

Explanation:

     This could happen for a series of reasons, but the main one is that, fish produce a watery urine because, if they had the same urine as we, humans, have, their body wouldn't be adapted to it inside the water. A watery urine is highly soluble in water , and this helps the fish not to contaminate the water he lives in.

        Osmosis works in a way that will always balance both sides of the equation, and this would happen with water, their body would balance the quantity of water in and out of the body.

explanation:

idk