It has 9 companies based in Bermeo, although the activities of the fleet take place several thousand miles away.

Currently a total of 19 ships are attached to the association, which operate in the tropical waters of the Atlantic (by the Gulf of Guinea) and Indian oceans (from the East African coast to the Chagos islands); they fish both within as well as outside the EEZs of the coastal countries, since the tuna in these waters is a highly migratory species and is not permanently located in a specific fishing ground.

The main tuna species caught by the freezer fleet are yellowfin and skipjack tuna, with more than 60% of production destined for export.

These species are tropical tuna in the Indian and Atlantic Ocean; this fleet does not catch bluefin tuna as is not usually found in tropical waters.

The fishing method is the purse seine using nets that surround the tuna shoal.
Once hoisted on board, the fish is frozen by immersing it in brine tanks at a temperature of -16 degrees Celsius.

The fish is unloaded directly to the canning factory in Africa (mainly in the Ivory Coast, Ghana, Madagascar, Seychelles, Mauritius, etc.) or transhipped to a refrigerated merchant vesselsdestined for the main tuna markets (Spain, Italy, Portugal, Thailand, etc.).
The ships only return for their programmed four-year repair.