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.
Freshwater fish tend to gain water.
if anything it would be reasonable to expect it to lose mass.
Oceans can both gain and lose water. They gain water from sources like rainfall, rivers, and melting ice caps. They lose water through processes like evaporation and when water is locked into glacial ice. Overall, the balance between these inputs and outputs determines whether the oceans are gaining or losing water.
rainfall and evaporation
water wheight is the wheight you gain/ lose in fuids for example when you dfo a activity that makes you sweat alot you lose water wheight but you will gain that wheight back as soon as you drink something
You lose water through urine, feces and perspiration (sweating). You gain water by eating, drinking and metabolic generation.
you can lose water.. which is heavy but as soon as ro rehydrate you gain the weight back.
get lypo suction
Lose
A cell placed in syrup would lose water through the process of osmosis. This is because the syrup has a higher concentration of solutes compared to the cell, causing water to move from the cell to the syrup in an attempt to equalize the solute concentrations.
You cannot gain weight by eating ice. Ice is water and water is used to hydrate the body. This may actually help you lose weight.
No, an equilibrium exist.