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) "Skipjack" had a noise problem in her reduction gears. ASW crews were provided the sound profile of the reduction gears; in addition, "Skipjack" was required to generate a unique sound signal at all times. This was done so the ASW crews could be certain they were targeting the right submarine and not accidentally launch a simulated attack on a real Russian submarine. As a result of all these safety measures and restrictions, the ASW forces were able to locate "Skipjack" nearly 50 percent of the time. At the end 1973 "Skipjack" was transferred to the submarine base at Groton in