Bluefin, e.g. (5)
(Other definitions for tunny that I've seen before include "A tuna" , "Warm water food fish" , "Large marine fish" , "Marine fish, the bluefin" , "Common food fish" .)
(Other definitions for tuna that I've seen before include "Large fish found in a nut" , "Species of fish" , "Large food fish" , "Warm-water food fish" , "Type of fish" .)