Researchers have cultivated certain fry in normal seawater and seawater containing twice the concentration of carbon dioxide. The fry grows up and are placed in a maze. Whenever they encounter obstacles, fish hatched in normal seawater will choose the right direction to avoid the obstacles. However, the fish that hatched under high carbon dioxide concentration will randomly choose to turn left or right, so that this fish has a reduced chance of survival when encountering natural enemies. 
In marine areas with high carbon dioxide concentration, the oxygen concentration is low. Less oxygen makes it difficult for marine life to breathe, and it becomes more difficult for foraging, avoiding predators and reproducing offspring.
 the researchers believe that the ability of fish to survive in a high carbon dioxide environment will be weakened.