Skipjack tuna important prey species for sharks and large pelagic fishes and is often used as live bait when fishing for Marlin. It has no scales, except on the lateral line and the corselet (a band of large, thick scales forming a circle around the body behind the head). It commonly reaches fork lengths up to and a weight of . Its maximum fork length is and maximum weight is . Ageing skipjack tuna is difficult, and the estimates of its potential lifespan range between 8 and 12 years. Skipjack tuna is a batch spawner. Spawning occurs year-round in equatorial waters, but
Skipjack-class submarine torpedo room and AMS for ballast tanks. The design was improved on the "Thresher"s, the one-off , and subsequent attack submarines by relocating the torpedo room into the operations compartment via angled midships torpedo tubes to make room for a large sonar sphere in the bow. The "George Washington" class, the first SSBNs, were derived from the "Skipjack"s, with rebuilt from the incomplete first . The hull of "Scorpion" was laid down twice, as the original hull was redesigned to become the "George Washington". Also, the material for building was diverted into building , which delayed "Scamp"s progress. The bow