What visual cue, besides fin color, might suggest an observer is looking at a Bigeye tuna instead of a Yellowfin tuna?
Answer
The dorsal fin is exceptionally high
While the pure yellow on the fins is a key indicator for Yellowfin, distinguishing it from close relatives like the Bigeye tuna requires careful observation of subtle differences. If the fins on a specimen exhibit a reddish or orange tint instead of yellow, or if the dorsal fin is noticeably and exceptionally high compared to standard Yellowfin morphology, it suggests the possibility that the fish is a Bigeye tuna.
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