Tuna is a large fish of the family Scombridae, mainly of the genus Thunnus, living in warm seas, about 185 km from the shore. Tuna is especially delicious seafood with very healthy eyes (bigeye tuna), processed into various delicious dishes and created a valuable source of export goods.

But to mention, there are 9 species of the genus Thunnus: 5 species of tuna that every angler should know:

• The albacore has an elongate, fusiform body with a conical snout, large eyes, and remarkably long pectoral fins. Its body is a deep blue dorsally and shades of silvery-white ventrally. The albacore is a very economically important fish and targets commercial and recreational fisheries.
• Atlantic bluefin tuna have been recorded at up to 680 kg (1,500 lb) in weight and rival the black marlin, blue marlin, and swordfish as the largest Perciformes. Bluefins are a top favorite among anglers. Bluefins have been one of the most important big-game species sought by sports seekers in America, Spain, Canada, France, and Italy.
• Skipjack tuna is an important commercial and game fish. It is a streamlined, fast-swimming pelagic fish, common in tropical waters throughout the world. It commonly reaches fork lengths up to 80 cm (2 ft 7 in) and a mass of 8–10 kg (18–22 lb).
• The yellowfin tuna is among the larger tuna species, reaching weights over 180 kg (400 lb), but is significantly smaller than the Atlantic and Pacific bluefin tunas, which can reach over 450 kg (990 lb), and slightly smaller than the bigeye tuna and the southern bluefin tunas.
• Bigeye tuna can grow up to 250 centimeters (98 inches) or 8 feet in length. The maximum weight of individuals probably exceeds 180 kg (400 lb), with the all-tackle angling record standing at 178 kg (392 lb). They are large, deep-bodied, streamlined fish with large heads and eyes.