There was a book about the eels being born from Sargasso sea, all transparent at first, that I remember reading ages ago. It mentioned a lot of legends as well surrounding the eels, because the young ones were never seen - only fully grown eels.
I cannot remember precisely, but to explain their existence, there were even some recipes about "creating" eels. I think one was something similar to "put a couple of sticks under a bit of wet turf for a night". And that is how the witches were able to create the eels.
I wish I could remember the title of the book, but unfortunately it was more than 30 years ago when I read it.
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