Yellowfin Tuna (Thunnus albacares) is a popular species of tuna found in pelagic waters of tropical and subtropical oceans worldwide, and is often known as Ahi, a term from Hawaii. Although, mostly found in deep offshore waters, they are highly migratory and are capable of coming close to the shore when suitable conditions prevail.
The Yellowfin Tuna is among the larger tuna species, reaching weights of over 150kg (330lb). In the seafood market, two grades of Yellowfin Tuna are recognised by buyers; namely “sashimi grade” ,”Grade A and “Regular.”
Bigeye Tuna (Thunnus obesus) is a true tuna of the genus Thunnus, belonging to the wider mackerel family Scombridae. It is generally recognised as an important food fish and prized recreational game fish. Bigeye Tuna is one of two species known as Ahi in Hawaiian – the other being the Yellowfin Tuna. They are found in the open waters of all tropical and temperate oceans, except the Mediterranean Sea. Their maximum weight can exceed 150kg (330lb), with the all-tackle angling record standing at 178kg (392lb).
Swordfish (Xiphias gladius), also known as broadbills, are large highly migratory, predatory fish characterized by a long, flat, sword-like bill. They are found widely in tropical and temperate parts of the Atlantic, Pacific, and Indian Oceans, from near the surface to a depth of 550m (1,800ft). Swordfish are the sole member of their family Xiphiidae. They can reach up to a length of 4.5m, with average length measuring 3.5m. Their average body weight is around 150-250kg, while the maximum weight is recorded at Over 500 kg.
Swordfish has great speed and agility in water and is one of the fastest fish in the ocean. They are not schooling fish and often swim alone or in very loose aggregation. Swordfish have been fished widely since ancient times, especially in Greece, and harpooning and long-line fishing are used to harvest them.