Bigeye tuna

Bigeye Tuna (Thunnus obesus) is a species of tuna in the family Scombridae. It is found in warm waters of the Atlantic Ocean, Indian Ocean, and Pacific Ocean. Bigeye tuna are among the larger tuna species, reaching weights of over 180 kg (400 lb).

Description

Bigeye tuna are notable for their large eyes and unique coloration. They have a metallic blue color on their backs and upper sides, with a silver-white color on their lower sides and belly. The two colors are separated by a distinct boundary line. The first dorsal fin is yellow or blue, while the second dorsal fin and anal fin are reddish-brown.

Distribution and Habitat

Bigeye tuna are found in the open waters of all tropical and temperate oceans, but they are most commonly found in the Atlantic Ocean, Indian Ocean, and Pacific Ocean. They prefer warm surface waters above 15 °C (59 °F), but they can also dive to depths of up to 500 m (1,640 ft) to find cooler waters when surface temperatures are too high.

Diet

The diet of bigeye tuna consists mainly of other fish, squid, and crustaceans. They are known to feed at greater depths than other tuna species, which may be related to their larger eyes and greater tolerance for low light conditions.

Fishing and Conservation

Bigeye tuna are a highly valued species in commercial fishing. They are caught primarily using longline fishing methods, but they are also targeted by purse seine and pole-and-line fisheries. Overfishing has led to a decline in bigeye tuna populations, and the species is currently listed as Vulnerable by the International Union for Conservation of Nature (IUCN).

Culinary Uses

In culinary contexts, bigeye tuna is prized for its high fat content and rich flavor. It is often used in sushi and sashimi, and it is also popular in grilled or seared dishes.

See Also

• Tuna
• Longline fishing
• Sushi
• Sashimi