Yellowfin tuna are torpedo-shaped with dark metallic blue backs, yellow sides, and a silver belly. They have very long anal and dorsal fins that are bright yellow, as are their finlets. Yellowfin can live up to 6 or 7 years, grow to a length of 2m and weigh 200kg.
Habitat and Distribution
Yellowfin are highly migratory and are found throughout the Pacific, Atlantic and Indian Oceans (between 40 degrees north and 40 degrees south but concentrated between 20 degrees north and 20 degrees south). Yellowfin tend to school by size with other yellowfin as well as with other species. Juvenile yellowfin, for example, form schools with skipjack tuna and juvenile bigeye tuna in shallow waters.
Yellowfin tuna reach reproductive maturity around 2-3 years of age. While spawning season varies by ocean, all yellowfin spawn frequently and several times during the season.