Once upon a time it was called miscegenation and was illegal. That was when a white married a different color.But they were the same species...homo sap.
I don't know what sex with a different species is called. Fish/human. I wonder how it's conducted?
Anyway wouldn't that be a crock to see a fish with a human face? Or fishhead with a human body?
Remember the scifi thriller of decades ago? THE FLY? How about THE FISH?