Eels and eels seem to say that they are all the same kind of fish, but in fact, there is a difference. In general: eels are a class of eels without pectoral fins and ventral fins. For example, the yellow eel, if you look closely, has no pectoral and ventral fins. The eel, the eel and the eel have pectoral fins. So (scratch the point!) Those with pectoral fins are called eels, and those without pectoral fins are called eels.

Yellow eel, no pectoral fins, light on both sides
There are also many eels in the ocean that are also pectoral finless, and the marine relatives of these yellow eels are generally called naked-breasted eels (in this case, pectoral fins).
Bean-spotted nuchal eel ( flower-spotted eel, flower eel, stone eel, pig's foot eel )
Cloud-striped naked-breasted eel (stone eel, tiger eel, money eel, potato eel)
Beautiful naked-breasted eel (stone eel, tiger eel, pig's foot eel)
Saddle-spotted naked-breasted eel ( broadband nude-breasted eel, money eel, potato eel )
White-edged naked-breasted eel ( Stone eel )
Spotted nuchal eel (Indian Ocean wolf-toothed moray eel, yellow-black spotted nude eel, stone eel, pig's foot eel)
Leopard-striped bare-breasted eel ( stone eel , tiger eel )
Bandi's naked-breasted eel (money eel, tiger eel, potato eel, ancient eel)
Brown-headed naked-breasted eel ( stone eel , tiger eel )
Yellow-edged bare-breasted eel (stone eel, tiger eel, pig's foot eel)
Serrated naked-breasted eel ( silky eel, pig-footed eel )
Moldy naked-breasted eel (flower eel, rice eel, strong naked-breasted eel, dumb eel)
Naked plow bare-breasted eel (scale flower, star-spotted nude eel)
Grumpy naked-breasted eel (sticky bare-breasted eel, stone eel, pig's foot eel, money eel, potato eel)
Tabby whiptail eel (whiptail eel, tiger-tailed eel, money eel, potato eel)
Snowflake spotted naked eel ( Money eel, cloud spotted naked eel )
Uniformly spotted nude-breasted eel ( Small-spotted nude-breasted eel )
Javan bare-breasted eel (tiger eel, pig's foot eel)
Small naked-breasted eel (money eel, potato eel)
The naked-breasted eels that can often be seen in the market are basically the above.
A class with pectoral fins is called eels, and there are several common eels below.
Moray eel (white eel)
Star Kang Ji Eel (Star Glutinous Eel, Star Eel)
Flower eel (reed eel)
Japanese eel (Ulla eel)
Crab-toothed eel (dog poke, hard bone usurper, usurper)
Omnivorous eel (earth dragon)