How would a saltwater fish respond if it is put in an aquarium of fresh water?

If a Saltwater Fish is placed in fresh water, it would experience a drastic change in its environment. The fish would begin to absorb fresh water through osmosis, leading to an imbalance in its bodily fluids. This could cause its cells to swell and potentially burst, resulting in severe physiological stress or even death. Saltwater fish are not adapted to handle low salinity, making their survival in fresh water unlikely.