Home [www.southseastuna.com] Operational Activities. SSTC produces two products from the tuna, the export frozen pre-cooked tuna loins and flakes, fishmeal and crude tuna fish oil with skipjack, yellowfin and big eye as the major Operational Activities. SSTC produces two products from the tuna, the export frozen pre-cooked tuna loins and flakes, fishmeal and crude tuna fish oil with skipjack, yellowfin and big eye as the major species processed.