So...

Hamachi is the Japanese name for amberjack, also called a yellowtail - but not to be confused with a yellow-tail tuna which is a totally different family... yellow-tail tuna is often referred to as "Ahi" which is ALSO a name used for bigeye tuna (not, as some people think, the enormous bluefin tuna). the yellow-tail tuna's proper name is Thunnus albacares - not to be confused with albacore tuna which is a different tuna entirely (Thunnua alalunga) - except in France & Portugal, where yellow-fin IS "albacore"... who KNOWS what they call "albacore" in France & Portugal...

This is the sound of me going insane, very slowly.