Yellowfin tuna

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The second dorsal fin and the anal fin, as well as the finlets between those fins and the tail, are bright yellow, giving this fish its common name. Reported sizes in the literature have ranged as high as 2. 2012 off Cabo San Lucas, Mexico. Yellowfin tuna are epipelagic fish that inhabit the mixed surface layer of the ocean above the thermocline. Although yellowfin tuna penetrate the thermocline relatively infrequently, they are capable of diving to considerable depths.

Although mainly found in deep offshore waters, yellowfin tuna may approach shore when suitable conditions exist. Yellowfin tuna often travel in schools with similarly sized companions. They sometimes school with other tuna species and mixed schools of small yellowfin, and skipjack tuna, in particular, are commonplace. Yellowfin tuna prey include other fish, pelagic crustaceans, and squid. Like all tunas, their body shape is particularly adapted for speed, enabling them to pursue and capture fast-moving baitfish such as flying fish, sauries, and mackerel. In turn, yellowfin are preyed upon when young by other pelagic hunters, including larger tuna, seabirds, and predatory fishes such as wahoo, shark, and billfish.