What happens to fish when they are dehydrated?
Fish that are dehydrated will lose water and their gill tissues will become dry. This makes it difficult for them to absorb oxygen from the water or air, and they may start to show signs of dehydration including protrusion of the eyes, sunken eyes, bulging veins in the body, and a loss of color in the flesh. If left untreated, fish can die from dehydration.