The yellowfin (also known as "ahi tuna") is distinguished by its long, bright-yellow dorsal fin and the yellow stripe down its body. More slender than the bigeye or bluefin tuna, yellowfins are the most tropical of the tuna species. Yellowfin is primarily caught by purse seine, but the higher-quality yellowfin is caught by hook and line. These fish range from the ocean surface to below 600 feet. High-quality yellowfin comes from Hawaii, Florida, Mexico, Southern California and the Gulf of California.