Depends. Can we Homo Sapian Sapian have offspring with them? If so, yes, it is all cannibalism. If, no, it is the same as eating a chimpanzee. Nothing that I would do, but not cannibalism.
Sushi...... Yuk
I guess you're not a fan of raw oysters then? or pearl diving for that matter.
Is it too early for a going down on a mermaid joke?
Is it ever too early to be going down on a mermaid? Smells and tastes like fish, no confusion on species there.