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  • Title: [Spatial-temporal variation in population structure of Antarctic krill (Euphausia superba)in the Scotia Sea, Antarctic in 2016.].
    Author: Ding B, Zhu GP, Zhang HT.
    Journal: Ying Yong Sheng Tai Xue Bao; 2018 Aug; 29(8):2763-2770. PubMed ID: 30182618.
    Abstract:
    The Scotia Sea occupies the highest density of Antarctic krill (Euphausia superba), which is the traditional fishing ground of krill fishery. However, the population structure of krill differed significantly inter-annually, seasonally and regionally. In order to understand the population dynamics of krill in this region, we analyzed the spatial-temporal variation on population structure of krill using samples collected randomly from fishery survey during January to September 2016. The results showed that sex ratio presented remarkably difference among different months. Females dominated in the population from January to May, but the opposite result occurred from June to September. During the survey period (January to September), juveniles only presented in the January popu-lation, and the percentage of adult females was over 40% and similar to that in February. The proportion of sub-adult females were over 50%, but the proportion of female adults were decreased gradually from March to May. The sub-adult males predominated in the population from June to August. The proportion of sub-adult females increased significantly but the number of male adults decreased in September. Sub-adult females occupied half of population in the Bransfield Strait from February to May. The proportion of spent females (25.6%) was higher than those of individuals with other sexual maturity stages and the gravid females occupied higher percentage of population off northeastern waters of the King George Island in January. From June to September, about half of the population was mature males, but the proportion of mature females was very low off northeastern waters of the South Georgia Island. Maturity stage composition indicated that peak spawning occurred in January and February and that spawning grounds occurred off northeastern waters of the King George Island and in the Bransfield Strait. 斯科舍海是南极大磷虾资源分布最为密集的海域,也是磷虾的传统渔场,但该海域磷虾种群结构存在较为显著的年际、季节性与区域性差异.为了解该海域磷虾种群动态,本研究利用2016年1—9月由渔业调查随机收集的样本,对该海域磷虾种群结构的时空变动进行了分析.结果表明: 各月磷虾性比存在显著的差异,1—5月雌性明显占优,而6—9月则呈现相反的趋势.1—9月期间,仅1月出现幼体,且雌性成体的比例与2月相当,占比超过了40%;3—5月,雌性未成体的比例均超过了50%,而雌性成体的比例开始逐月下降;6—8月,雄性未成体的比例达到峰值;9月,雌性未成体的比例显著增加,而雄性成体的比例呈下降趋势.在布兰斯菲尔德海峡内,2—5月,雌性未成体的比例超过一半;1月,乔治王岛东北水域已排卵个体的比例(25.6%)显著高于其他个体,雌性临产个体的比例也较高;6—9月,南乔治亚岛东北水域雄性成体的比例约占一半,雌性成体的比例极低.性成熟度组成显示,1—2月为磷虾产卵盛期,而产卵场出现在乔治王岛东北水域以及布兰斯菲尔德海峡.
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