Bigeye tuna | WWF

Bigeye tuna

Key Facts

  • Common Name

    Bigeye tuna

  • Scientific Name

    Thunnus obsesus

  • Habitat

    Open Ocean

  • Location

    Pacific, Atlantic and Indian Oceans

  • Status

    At risk from overfishing in Atlantic; classed as vulnerable by IUCN.

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  • Length

    Between 60 and 250 cm

  • Weight

    Upto 180 kg

Physical Description
Bigeye tuna are generally smaller than bluefin and larger than yellowfin. They reach a length of between 60 and 250cm, and weigh around 180kg, and live 10 to 12 years. They are long and streamlined, dark metallic blue on their backs and upper sides, and have nearly white lower sides and belly.

Habitat and Distribution
Bigeye are a highly migratory species found throughout the Atlantic, Pacific and Indian Oceans between 30 degrees north and 20 degrees south. They can be found from the surface to 250m deep, depending on the age of the bigeye and where prey can be found.

Bigeye tuna reach reproductive maturity around age 3, and at around 1m in length. They spawn throughout the year in tropical waters.

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