Bigeye Tuna

Bigeye Tuna Fish Facts, Diet, Characteristics, Habitat, Mating, Nutritional facts with its size and weight are discussed in details on this page.

Bigeye Tuna

Bigeye tuna play an important role in the food fish and prized recreational game fish. It is one of the true tuna of the genus Thunnus, belonging to the large mackerel family Scombridae. Bigeye found in the open waters of almost all tropical and temperate oceans, but not in the Mediterranean Sea. The species of tuna can grow up to 8 feet in length. These are large, deep-bodied, streamlined fish with large heads and eyes. They have approximately 13 or 14 dorsal spines.

Bigeye Tuna Characteristics

The Bigeye Tuna have large, deep bodied, streamlined fish with large eyes and heads. The pectoral fins are very long and reaching back beyond the start of the second dorsal fin in juveniles and there is space between the first and second dorsal fin in adults. They have the total 13-14 dorsal spines on their body.

The species can grow up to 250 cm or 8 feet in length and the maximum weight of the body can exceed 180 kg. They have the unique physiology that allows them to find out the food in deeper colder waters and survive in the low oxygen waters.Bigeye Tuna | Thunnus Obesus

Other namesThunnus Obesus
Average Size40-180 cm
Max. Size & Weight230 cm & 460 Pounds
Max Age10-12 years
Catching Area19% the Atlantic Ocean

21% Eastern Pacific

22% Indian Ocean

38% Western Pacific

Biggest MarketsJapan (Sashimi)
Production AreasMexico, Ecuador, Thailand, Indonesia, Philippines, Spain, Colombia

Bigeye Tuna Diet

Bigeye Tuna primarily feed on mesopelagic (deep water) and epipelagic (Surface) by eating crustaceans and Cephalopods. Sometimes, the species get their diet from the surface of the water by prey invertebrates while few times, they have to deep dive in the water to foraging. They have the physical ability by which they can dive deep into the cold water and have less oxygen.

Bigeye Tuna Habitat

Bigeye Tuna is the species who continuously move their location throughout found in Atlantic, Pacific, and Indian Oceans between 30 degrees north and 20 degrees south. They can easily find at the surface of water or deep up to 250 m which rely on the prey they can find easily. The habitat also depends on the age of the bigeye.Thunnus Obesus | Bigeye Tuna Fish

Bigeye Tuna Behavior

The behavior of this tuna is much similar to the other types of tunas. The species continuously shift their location from one location to another and spawning the open seas. The fish needs the proper diet to keep it happy and otherwise, it behaves weirdly.

The species get their diet from the water surface and dive in the deep for the diet. These are capable to survive in the low oxygen and comfortable in the low temperature water as well. The tuna species usually grow in bigger size and even feed the other small fishes.

Bigeye Tuna facts

  • The scientific name of bigeye tuna is Thunnus obesus.
  • Adult male tuna of this species can weigh up to 460 Pounds.
  • It can be as long as 6 feet in length.
  • These tuna can live up to 10-12 years.

Bigeye Tuna as Pet

It is a good idea because of the IUCN Red list of threatened species declared the species vulnerable. You can get the little bigeye tuna as the pet but they grow quickly. So, you required a large aquarium to place it. You can get the little bigeye at the house but when it grows large, then you can leave it in the open sea instead of getting a large size aquarium for it.

Bigeye Tuna Mating

The bigeye tuna get the maturity of reproduction at the age of 2-3 years. The spawning process for reproduction is different in various locations. The best season for spawning of bigeye tuna occurred in the month December to January and in June. They spawn in the open sea and lay millions of eggs.

The eggs are coated with the film of oil and hatching starts within 48 hours. The young ones live few days around the hatching area. Later, as they grow, they start going deep water for food. The ability to survive in the poor oxygen water help them to hunt to get a proper diet to grow their size.

The bigeye tuna is also known as the Thunnus Obesus. The species is very popular in the Tokyo for the Sashimi and sushi. Japan is the major market for the tuna species. They can grow up to 8 feet while their average size is 40-180 cm. If you are searching for other Tuna species then stick with the site and explore it.  If you want to know more about other tuna species then check out: Tuna Fish Species

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