in taverly dungeon with 53 fishing beware of baby blue drags you need a dusty key
no
Cave eels may be found in the Lumbridge Caves.Cave eels require level 38 fishing to obtain as well as a cooking level of 38 in order to cook them.
there is some in the wilderness somewhere by lava i think
You kill chaos Dwarves there I think, and they drop the key.
Deep Wilderness, on the World Map look for "Lava Maze". He's in there.
the lava maze muddy chest, is located outside amongst the demons.
The Lava Maze is yes, bounty hunter on the other hand is free to play.
Probably not that far away.
Yes, mainly because it homes the King Black Dragon and a few Black Dragons.
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.
A regular fishing rod and fishing bait are required to catch them. It can only be caught in the Mort Myre swamp, Meiyerditch dungeon and in the Lumbridge Swamp Caves.
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.