We all know that fish swim in the water, so swimming should be a natural ability of fish, but unfortunately this is not the case, fish are not born swimming masters, according to Live Science report , When the larvae are just hatched from the eggs, they are also reelingly and make unremitting efforts to survive. About 99% of fish deaths occur in the juvenile stage. Some fish are better able to escape predators only when they are older. Adult fish will use the break and slide method to quickly escape predators. This method allows them to accelerate quickly and then run away by sliding. And for many fish, they are not born with this method.

Sapphire fish

For a long time, scientists have speculated , may be due to the fact that the weight is too light to make it difficult for these small fish to gain enough power in the breakthrough stage. Perhaps they are so small that the water blocks them like a sticky syrup, making it difficult for them to glide well.

However, a new study suggests otherwise. The study of zebrafish juveniles showed that the poor swimming skills of the small fish were caused by their underdeveloped lateral fins and swim bladders, which did not keep their bodies level. The researchers also said that their findings may also apply to other species of fish.

The study leader, Ulrike Müller of Wahanningen University in the Netherlands, said the dynamic factor could explain the poor swimming of some larvae, but not all. in this way. Moreover, the differences in their gliding abilities cannot be explained by differences in fish body size. Many small fish hatch with their pectoral fins not fully formed, and none of the fish hatch with a swim bladder. So, they may have similar problems with poor swimming.