We do not know as eels do not leave good fossils. Also your English is a bit wrong your question should be worded "How many extinct eels were there". This is because if they are extinct they would have lived in the past not the present.
Sand eels eat a variety of crustaceans including crab and shrimp. They are actually a species of small fish rather than an eel.
The Amazon River is home to the most electric eels. These animals, actually fish and not eels, live throughout South America and can deliver a shock of as much as 600 volts.
Actually most moray eels don't really need large tanks, and a 70 gallon will do fine for most species.
The types of eels are salt water eels, freshwater eels, the swamp eels, rubber eels and the electric eels. It is an elongated fish that lives in the shallow waters.
Adult eels are called eels, babies are elvers
in eels
electric eels have an electric current that shocks thing Moray eels dont
Eels are classified as fish!
eels eat fish
Eels have electricity.
Eels are not naturally in Utah's bodies of water but there are eels in pet shops and aquariums.