CATDOLL : CATDOLL: Are eel eggs incubated internally or externally?

It is understood that the reproductive season of the yellow eel is about June to August. In its individual development, it has the characteristics of male and female reversal, that is, it is female from the embryonic stage to the first sexual maturity (that is, the gonads of individuals with a body length of less than 35 cm are all ovaries); after spawning, the ovaries gradually become testes; when the body length is 36-48 cm, the sex is partially reversed, and the male and female individuals are almost equal; those that grow to more than 53 cm are mostly testes. When the young fish can only grow to 20 cm, the female fish will reach maturity after 2 winters, with a body length of at least 34 cm. The largest individual can reach 70 cm and weigh 1.5 kg. The yellow eel lays eggs near the entrance of its burrow. Before spawning, it spits foam from its mouth to form a nest. The fertilized eggs develop on the water surface in the foam with the help of the buoyancy of the foam. Both male and female fish have the habit of protecting the nest.