Eels have spines.

Eels belong to the family Eelidae, the genus Eel, and although they look more similar to snakes, they are still a type of fish. Most of the fish have spines, because spines are very important to them. The spines of fish are similar to the role of human bones, which are used to support the body, so eels also have spines.

The role of the spines in the eel's body is very great, with the spines, the eel can more smoothly carry out a variety of activities, and the spines can also protect the eel's internal organs, reducing their chances of injury.

While eels have spines, there are not many spines in their bodies. Compared to other freshwater fish, it is one of the less spiny ones. They basically only have one main spine in their body, which is sort of their spine.

This main spine is relatively large and runs the entire length of the body, so there are fewer smaller spines around it. Because eels have fewer spines and are more nutritious, all of them are loved by many people.

Eel habits:

Eels like to live in clean, unpolluted waters. Eels grow in rivers on land and migrate to spawning grounds in the ocean to lay their eggs once in their lifetime when they mature, and die after spawning. This life pattern, in contrast to the anadromous nature of salmon, is called descending migratory (Catadroumous).

Its life history is divided into six different developmental stages, and in order to adapt to different environments, the body size and color of the different stages change dramatically: Egg-stage: Located in deep-sea spawning grounds.

The sex of eels is determined by the environment. The proportion of females increases when the population is small, and decreases when the population is large, with the overall ratio favoring the increase of the population.

Eel fry cannot be bred by artificial propagation, mainly because eels have a very specific life history that is difficult to simulate in a man-made environment. The Japanese eel grows into an adult eel in a freshwater river, and in the summer it begins its migration from the river to the ocean to spawn, which is the opposite of the anadromous migration of trout and salmon, which swim from the ocean back to the river to spawn.

It's spawning grounds are thousands of kilometers away in the deep sea between the Philippines and the Malaysian archipelago. Scientists discovered this spawning ground mainly because of the large number of its newly hatched young that are harvested here. Eels spawn and reproduce in the deep sea and thrive in freshwater environments. It is aggressive, voracious, active, diurnal, light-focused, likes running water and warmth.