1. When the eel reaches adulthood, its body length is generally between 20-70 cm. It can be seen that the body lengths of different eels vary greatly. In addition, there are eels that are larger in size, with a body length of more than 1 meter, but such large eels are not particularly common.

2. Specifically, there are many different factors that will affect the specific body size of the eel, resulting in differences in the body size of different eels. For example, various factors in the environment have a relatively large impact on the eel. For example, water temperature is one of the more important factors. Water temperature mainly affects the eel's appetite, and the level of appetite will affect the eel's development and ultimately affect their growth rate. If you want to artificially breed eels and make them grow better, you need to pay attention to regulating the surrounding environment and keep the surrounding environment in a suitable state.