...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ICES Journal of Marine Science >Changes in size, age, and sex ratio composition of Pacific bluefin tuna (Thunnus orientalis) on the northwestern Pacific Ocean spawning grounds
【24h】

Changes in size, age, and sex ratio composition of Pacific bluefin tuna (Thunnus orientalis) on the northwestern Pacific Ocean spawning grounds

机译：西北太平洋产卵区太平洋蓝鳍金枪鱼（Thunnus Orientalis）的大小，年龄和性别比组成的变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Pacific bluefin tuna (Thunnus orientalis, PBF), an iconic fisheries species, is heavily exploited and its biomass is at a historically low level. To enhance effectiveness of management and conservation, a study was initiated to examine the demographic changes of the PBF between 2002 and 2015. Annual tuna age compositions were estimated by applying an empirical age-length key, based on the ages and lengths of 892 fish, to the length frequencies observed among annual catches in the northwestern Pacific spawning grounds located near Taiwan. Ages of the spawners concentrated in 7-20-years old (range = 4-28 years), corresponding to fork lengths between 200 and 240 cm. The size and age compositions were influenced by the strong 1994 and 1996 year-cohorts, which showed a relatively high abundance in most years except 2007-2009. Between 2013 and 2015, recruits of 2005-2009 year-cohorts (age 6-10) increased in relative abundance while the strong 1994 and 1996 year-cohorts decreased as they neared the end of their lifespan. PBF smaller than 200 cm were rarely found in the tropical areas and the mean sizes of the PBF caught south of 24 degrees N were significantly larger than those caught north of 24 degrees N. These results suggested that the choice of spawning latitudes of the PBF was influenced by the size of spawning adults. The sex ratio of smaller (<200 cm) and intermediate size classes (200-230 cm) was female biased (50-75%) while that of larger fish (>240 cm) were male biased (62-100%). The size and age composition of the PBF was mainly influenced by the recruitment of young spawners and was less sensitive to the catch of longline fisheries. However the impact of longline fisheries on the reproductive potential of this species warrants further investigation.
机译：太平洋蓝鳍金枪鱼（Thunnus Orientalis，PBF）是标志性的渔业物种，已被大量开发，其生物量处于历史低位。为了提高管理和保护的有效性，启动了一项研究以检查2002年至2015年PBF的人口变化。通过根据892条鱼类的年龄和长度，使用经验年龄长度密钥估算年度金枪鱼年龄组成，在台湾附近的西北太平洋产卵场年捕获量中观察到的长度频率。产卵器的年龄集中在7-20岁（范围= 4-28岁），对应于200至240 cm之间的叉子长度。规模和年龄构成受到1994年和1996年强劲的队列的影响，除2007-2009年外，大多数年份都显示出相对较高的丰度。在2013年至2015年之间，2005-2009年年龄段（6至10岁）的新兵相对丰富，而接近1994年和1996年的强势年龄段则随着寿命的临近而减少。在热带地区很少见到小于200 cm的PBF，在北纬24度以南捕获的PBF的平均大小明显大于在北纬24度以北捕获的PBF的平均大小。这些结果表明，对PBF产卵纬度的选择是受产卵成虫大小的影响。较小（<200 cm）和中等尺寸类别（200-230 cm）的性别比是女性偏爱的（50-75％），而较大鱼（> 240 cm）的性别比是男性偏爱的（62-100％）。 PBF的大小和年龄组成主要受年轻产卵者的影响，对延绳钓渔获的敏感性较低。然而，延绳钓渔业对该物种繁殖潜力的影响值得进一步研究。

著录项

  • 来源
    《ICES Journal of Marine Science》 |2017年第1期|204-214|共11页
  • 作者

    Shiao Jen-Chieh; Lu Han-Bo; Hsu Jhen; Wang Hui-Yu; Chang Shui-Kai; Huang Min-Yu; Ishihara Taiki;

  • 作者单位

    Natl Taiwan Univ, Inst Oceanog, 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan;

    Natl Taiwan Univ, Inst Oceanog, 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan;

    Natl Taiwan Univ, Inst Oceanog, 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan;

    Natl Taiwan Univ, Inst Oceanog, 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan;

    Natl Sun Yat Sen Univ, Inst Marine Affairs, 70 Lienhai Rd, Kaohsiung 80424, Taiwan;

    Taiwan Fisheries Res Inst, 199,He 1st Rd, Keelung, Taiwan;

    Natl Res Inst Far Seas Fisheries, Shimizu Ku, 5-7-1 Orido, Shizuoka, Shizuoka 4248633, Japan;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    demography; otolith; Pacific bluefin tuna;

    机译：人口统计学;耳石;太平洋蓝鳍金枪鱼;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号