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
USS Skipjack (SSN-585) been to St. Croix and some of the return trip was conducted on the surface. From March thru June, "Skipjack" provided bridge training to students at the Submarine Officer Basic School in Groton, mostly running up and down the river. During one trip out of the sound the anchor got stuck. Divers were called out from Groton to cut the anchor chain and retrieve the anchor. "Skipjack" entered dry-dock for the third time in three years to have the anchor fixed, at a cost of about $75K. "Skipjack" left Groton in early July to transit to Norfolk. After arrival "Skipjack"