This is a local story from near where I live. I have trouble believing in it but I wanted to see what your view on it is.
It supposedly happened in 1607.
It was in a place called skiningrove, the locals found a merman floating near the surface when fishing, they caught it, brought it back to the village and fed it fish. The merman also preferred the company of women rather than men. When the vicar or bishop came he tried to talk to it (the merman), it didn't understand, the holy man then began to torture the merman. A few days later the merman escaped and the locals watched it swim away.
If anybody has heard this and I've got the some parts of the story wrong please tell me.
I'll try and find a link to.