Here's someone clearly singing "Shoals of Herring," and the poster thinks it's "Shores of Erin."

Which doesn't even make sense in the song!

http://www.youtube.com/watch?v=HiU04meCXI0

Come on. Has anybody actually heard a real song called "The Bonny Shores of Erin" that had anything to do with MacColl's song?

The Internet suggests not.

It's a big jump from a mondegreen to a whole song built around it.