Willow eel is a special period of larval development of some fish (such as eel). Its body is flat and transparent, as thin as willow leaves, and its edge is fluorescent. Wicker eels swim slowly by the ups and downs of their bodies and strange fins. Dig a hole quickly with a pointed tail and backward movement of the body. The sex of willow eel is mainly determined by environmental factors, and the spawning ground is generally located on the continental slope or in the basin not far from the shore.
Extended data:
The development process of eels is divided into six different stages. In order to adapt to different environments, the body shape and body color of different stages have changed greatly:
1. Oval stage: located in deep-sea spawning ground.
2. Willow eel: It drifts with ocean currents for a long distance. At this time, its body is flat and transparent, as thin as willow leaves, and its edge is fluorescent, so it is convenient to go with the flow.
3. Glass eel: When approaching coastal waters, the body is streamlined, reducing resistance to get rid of strong ocean currents.
4. Eel line: When entering the estuary waters, melanin begins to appear, but it also forms a supplementary source of eel fry in aquaculture.
5. Monopterus albus: During the growth of the river, the belly of the fish is yellow.
6. Silver eel: When mature, the fish body turns silvery white like deep-sea fish, and at the same time, the eyes become bigger and the pectoral fins become wider to adapt to migrating to the deep sea to lay eggs.