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LI Baoquan,ZHOU Zhengquan,LI Bingjun,WANG Quanchao,LI Xiaojing,CHEN Linlin. 2018. Size distribution of individuals in the population of Asterias amurensis (Echinodermata: Asteroidea) and its reproductive cycle in China. Acta Oceanologica Sinica, 37(6):96－103

Size distribution of individuals in the population of Asterias amurensis (Echinodermata: Asteroidea) and its reproductive cycle in China

烟台多棘海盘车种群的个体大小分布及生殖周期

Received:January 16, 2017 Revised:August 29, 2017

DOI：10.1007/s13131-018-1177-5

Key words:sea star gonad index pyloric caeca index shellfish mariculture Yantai

中文关键词: 海星性腺指数幽门盲囊指数扇贝养殖烟台

基金项目:The Strategic Priority Research Program of the Chinese Academy of Sciences under contract Nos XDA11020403 and XDA1102702; the Key Research Program of the Chinese Academy of Sciences under contract No. KZZD-EW-14; the Science and Technology Service Network Initiative Program under contract No. KFJ-EW-STS-127; the self-deployment project of Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences under contract No. YICY755021012.

Author Name	Affiliation	E-mail
LI Baoquan	Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
ZHOU Zhengquan	Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China University of Chinese Academy of Sciences, Beijing 100049, China
LI Bingjun	Ocean School, Yantai University, Yantai 264005, China
WANG Quanchao	Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China University of Chinese Academy of Sciences, Beijing 100049, China
LI Xiaojing	Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China University of Chinese Academy of Sciences, Beijing 100049, China
CHEN Linlin	Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China	llchen@yic.ac.cn

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Abstract:

To obtain baseline information on the size distribution of individuals in the population and reproductive features of sea star Asterias amurensis, monthly surveys of the population were carried out from May to December 2010 and March to May 2015 in coastal waters off Yantai, China. Spawning period was predicted by gonad and pyloric caeca indices as well as anatomical and histological methods. In the A. amurensis population, both large individuals (>143 mm) and small ones (<42 mm) were present in all sampling months. The population size structure was driven by the appearance of big cohorts of individuals less than 55 mm from May to August. The appearance of small individuals in all months suggested a prolonged spawning period at other sites in this bay or sea stars growing slowly because of food shortage. An arm length is a good predictor to wet body weight for A. amurensis. The development of gonad was relative slow from May to September but rapidly reached a peak of 20.95 in October 2010, and then dropped remarkably, indicating its spawning lasted from October to November. The same phenomenon was found from March to May 2015, suggesting another spawning during March to May, which was also verified by the results of histologic analysis on ovary. The gonad index (GI) and pyloric caeca index (PCI) tended to show a negative relationship. Due to the poor food availability, the reproductive characteristics of sea star were most likely affected by the shellfish mariculturein Yantai coastal waters.

中文摘要:

为了解烟台多棘海盘车种群个体大小分布及繁殖特征，自2010年5月至12月及2015年3月到5月，在烟台近海对该种群分别进行逐月采样调查。利用性腺指数(GI)和幽门盲囊指数(PCI)以及解剖组织学方法预测其产卵周期。结果表明：在所有的采样月份中，体长大于143mm的个体与体长小于42mm的个体在种群中均同时存在；在5-8月期间，种群结构特征以体长小于55mm的个体为主。同时该海域不同站点的采样月份中均有小个体存在，说明种群的产卵周期存在延后现象或者由于食物短缺造成了海星生长缓慢。腕长可以很好的用来衡量还行身体湿重。性腺在2010年5月-9月发育相对缓慢但在十月份迅速到达峰值20.95，之后明显下降，表明其产卵期从10月份持续至11月份。2015年3月-5月也发现了同样的现象，表明该种群自3月-5月存在另一个产卵期，且通过对卵的组织学分析也进一步证实该产卵期的存在。性腺指数和幽门盲囊指数呈负相关关系。由于食物来源短缺，烟台近海海星种群的繁殖特征极有可能受到当地近海扇贝养殖的影响。

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