Skipjack tuna addition, skipjack's livers were tested globally for tributyltin contamination. TBT is an organotin compound introduced into marine ecosystems through antifouling paint used on ship hulls, and has been determined to be very toxic. About 90% of skipjack tested positive for contamination, especially in Southeast Asia, where regulations of TBT use are less rigorous than in Europe or the US. Skipjack tuna is used extensively in Japanese cuisine, where it is known as . Besides being eaten seared () and raw in sushi and sashimi, it is also smoked and dried to make katsuobushi, the central ingredient in dashi (a common
USS Skipjack (SSN-585) preparation for a refueling overhaul at General Dynamics' Electric Boat Division. After conducting a few more exercises, "Skipjack" entered the shipyard for overhaul in the summer of 1974 and remained inactive until the fall of 1976. "History from 1976 to 1979 needed." "History from 1980 to 1986 needed." On August 16, 1980, 'Skipjack' was in port in Callao, Peru, along with another US Navy surface vessel. In 1986, "Skipjack" deployed on a "Northern Run" to the North Atlantic Ocean. In 1987 "Skipjack" deployed to the Mediterranean Sea, returning in early September and entering dry-dock for the September – November time