Lyons K, Preti A, Madigan D J, Wells R J D, Blasius M E, Snodgrass O E, Kacev D, Harris J D, Dewar H, Kohin S, MacKenzie K, Lowe C G
California State University Long Beach, Department of Biological Sciences, 1250 Bellflower Blvd, Long Beach, CA 90840, U.S.A.
Ocean Associates, Incorporated, 4007 N Abingdon Street, Arlington, VA 22207, U.S.A.
J Fish Biol. 2015 Jul;87(1):200-11. doi: 10.1111/jfb.12709. Epub 2015 May 21.
In June 2013, a record-breaking female Isurus oxyrinchus (total length 373 cm, mass 600 kg) was captured by rod and reel off Huntington Beach, California, where it was subsequently donated to research and provided a rare opportunity to collect the first data for a female I. oxyrinchus of this size. Counts of vertebral band pairs estimate the shark to have been c. 22 years old, depending upon assumptions of band-pair deposition rates, and the distended uteri and spent ovaries indicated that this shark had recently given birth. The stomach contained a c. 4 year-old female California sea lion Zalophus californianus that confirmed the high trophic position of this large I. oxyrinchus, which was corroborated with the high levels of measured contaminants and tissue isotope analyses.
2013年6月，一条破纪录的尖吻鲭鲨雌鲨（全长373厘米，体重600千克）在加利福尼亚州亨廷顿海滩附近被用钓竿钓获，随后它被捐赠用于研究，这为收集如此大小的尖吻鲭鲨雌鲨的首批数据提供了难得的机会。根据椎骨带对的数量估计，这条鲨鱼约22岁，具体年龄取决于对带对沉积率的假设，其子宫扩张且卵巢已排卵，表明这条鲨鱼最近产过仔。胃里有一只约4岁的加利福尼亚海狮雌兽，这证实了这条大型尖吻鲭鲨处于较高的营养级，这一点通过所测污染物的高含量和组织同位素分析得到了佐证。
