Recommend "The Truth About Animals" by Lucy Code [0]. It has good chapter on eels. They take a left and go to the USA or take a right and go to Europe.
[0] https://www.goodreads.com/book/show/34211802-the-unexpected-...
[0] https://www.goodreads.com/book/show/34211802-the-unexpected-...
Longfin eels are long-lived, migrating to the Pacific Ocean near Tonga to breed at the end of their lives. They are good climbers as juveniles and so are found in streams and lakes a long way inland.