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) Night" from 15 September to 9 October. On 22 October, "Skipjack" returned to Norfolk, where she remained through January 1972. "Skipjack" spent most of 1972 in tests and type training out of Groton, CT and Norfolk, VA as well as the Caribbean. The submarine returned to Norfolk in late 1972. Toward the end of spring in 1973, "Skipjack" returned to the Mediterranean Sea and conducted several exercises with the Sixth Fleet. During that time "Skipjack" was home ported at La Maddalena on the NE corner of Sardinia. Returning to Norfolk in September "Skipjack" crossed paths with Hurricane Ellen during the