Eel fry cannot be artificially reproduced because it has a relatively special living habit and it is difficult to artificially simulate its breeding ring.

Eels grow in rivers on land. When mature, they migrate to the ocean to lay eggs in spawning grounds. They only lay eggs once in their lives and will die after laying eggs. The young eels are only as long as fingers and cannot tell their gender. They flow into the river until they grow up to adults and identify their gender. After a few years, they will return to the ocean again to mate and lay eggs, so it is difficult to simulate their living environment under artificial conditions.

For example, after Japanese eels grow up in freshwater rivers, they will begin to migrate to the ocean to lay eggs in summer, and they will swim back to rivers with trout, salmon and other animals from the ocean to lay eggs in anadromous migration. Opposite habits.

Extended information:

Life habits of eels:

1. The life history of eels is divided into 6 different development stages. In order to adapt to different stages and different The body shape and color of the environment have changed greatly. During the egg stage, they are located in the spawning grounds of the deep sea.

2. The gender of eels is determined by the environment. When the population is small, the proportion of female fish will increase, and when the population is large it will decrease. The overall proportion is conducive to the increase of the population.

Eels are ferocious, restless, gluttonous, live in the day and night, like running water, have strong photorotation, and love warmth. Adult eels grow faster, have a round, cone-shaped appearance, are dark in color, and have fresher meat.