Researchers have cultivated a certain kind of fries in daily sea water and sea water containing twice the concentration of carbon dioxide. After the fries grow up, they are placed in a maze. Whenever they encounter obstacles, fishes that hatched in normal seawater choose the right direction. However, the fishes that hatched under high carbon dioxide concentration randomly choose to turn left or right, so that this kind of fishes have a reduced chance of survival when encountering natural enemies. 
Carbon dioxide is an important nutrient for many marine organisms. Under exposure, they convert the carbon dioxide absorbed by leaves and the water transported by leaves into sugar, starch and oxygen.
 the researchers believe that in a high carbon dioxide environment, the ability of hatched fish to survive will be weakened.