Tuna is the general name for a group of migrating, pelagic ocean fish, belonging to the Scombridae family. Tunas migrate in schools between tropical and intermediate waters. The characteristic shape makes the tuna a perfect cruiser. Top-speeds of over 80 km/hour are no exception. The smallest tuna is around 50 cm (1-2 kg). The Atlantic Bluefin tuna is the biggest tuna in the sea, with a length of over 3 meters (600 kg). Tunas are pelagic hunters, feeding on small fish, squid and crustaceans. 

The commercially most important tuna species are Skipjack tuna (Katsuwones pelamis with 57.5%), Yelllowfin tuna (Thunnus albacares with 27.1%), Big eye tuna (Thunnus obesus with 9.6%), Albacore tuna (Thunnus alalunga with 4,7%). Skipjack tuna is mostly used in the tuna canning industry. Whereas Yellowfin tuna is mostly sold fresh or frozen.

Bigeye Tuna

Albacore Tuna

Yellowfin Tuna


Did you know

  • An Albacore Tuna has been traced for over 8500 km from California to Japan. The average tuna speed was 25 km a day.
  • A Tuna never stops swimming. The average speed is at least 1 body length per second.
  • A Tuna can eat 5% of their own body weight in food per day!
  • The average length of a Tuna differs per ocean.

Most tunas are migrating species. Fishing pressure in one area can influence stocks in other areas. Therefore, stock management needs to be regulated on an international scale. Five Regional Fisheries Management Organisations (RMFO’s) arrange the management of the worldwide tuna stocks. Stock assessments are implemented and research results are gathered to realize the best management strategies. The main goal of these organisations is to keep the tuna population at the Maximum Sustainable Yield (MSY) or below. Decisions that can be made to reach this goal are: implementing TACs (Total Allowable Catches), reducing fishing capacities, closing important nursing areas and implementing minimum fish sizes for landings. Our tuna is subject to these management measures. Open seas does not distribute tuna from IUU (Illegal, unreported & unregulated) fisheries and is completely traceable from boat to plate.