【作者】 吴晓峰； 耿智； 徐静静； 张涛； 冯广朋； 杨刚； 庄平；

【Author】 WU Xiaofeng;Geng Zhi;Xu Jingjing;Zhang Tao;Feng Guangpeng;Yang Gang;Zhuang Ping;East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences;

【机构】 上海海洋大学水产与生命学院； 长江口渔业生态重点实验室东海水产研究所中国水产科学研究院；

【摘要】 2017年11月至2018年4月研究了长江口中华绒螯蟹种群结构和繁殖特征。2017年长江口中华绒螯蟹汛期总捕捞量为112.21t,单船汛期捕捞量为925.69-1767.76kg,均值为1395.92kg;日均捕捞量为328.25-1177.55kg,均值为742.66kg。长江口中华绒螯蟹平均壳长为40-60mm,平均体重为60-120g,与往年数据相比均有所下降;甲壳长-体重呈幂函数关系。随着汛期后延,崇明西滩雌蟹比例逐渐下降,崇明东滩雌雄比基本保持1:1,横沙浅滩雌蟹比例波动明显,九段沙雌蟹占比维持在6.12%-35.71%之间。长江口中华绒螯蟹繁殖期为12月至4月,崇明东滩繁殖高峰期为12月,平均生殖力为122028±54326粒;九段沙繁殖高峰期为12月、1月、3月和4月,平均生殖力为42685±40005粒;横沙浅滩只在3月和4月发现抱卵蟹,平均生殖力为174266±157062粒,与往年数据相比处于较低水平。更多还原

【Abstract】 The population structure and reproductive characterwastics of Eriocheir sinensis in the Yangtze River Estuary were studied from November 2017 to April 2018. The total catch of Eriocheir sinensis in the Yangtze River Estuary was 112.21 t in 2017, and the single-boat catch was 925.69-1767.76 kg, with an average of 1359.92 kg. The average daily catch was 328.25-1177.55 kg and the average was 742.66 kg. The average shell length of Eriocheir sinensis in the Yangtze River Estuary was 40-60 mm, and the average weight was 60-120 g, which is lower than previous years. The relationship between shell length and weight is a power function. With the extension of flood season, the proportion of female crabs in Chongming Xitan gradually decreased. The ratio of male to female in Chongming Dongtan remained 1:1. The proportion of female crabs in Hengsha Shoal fluctuated significantly, and the proportion of female crabs in Jiuduansha remained between 6.12%-35.71%. The breeding period of Eriocheir sinensis in the Yangtze River Estuary was from December to April. The reproductive peak period of Chongming Dongtan was December, the average fecundity was 122028±54326; the reproductive peak period of Jiuduansha was December, January, March and April, the average fecundity was 42685±40005; in the Hengsha Shoal, the berried crab were only found in March and April, and the average fecundity was 174266±157062, which is lower than the previous years.更多还原