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引用本文:刘亚秋,李新辉,李跃飞,陈蔚涛,李捷,朱书礼.西江广东鲂(Megalobrama terminalis)繁殖生物学及繁殖策略.湖泊科学,2021,33(1):232-241. DOI:10.18307/2021.0117
Liu Yaqiu,Li Xinhui,Li Yuefei,Chen Weitao,Li Jie,Zhu Shuli.Reproductive biology and strategy of Megalobrama terminalis of Xijiang River. J. Lake Sci.2021,33(1):232-241. DOI:10.18307/2021.0117
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西江广东鲂(Megalobrama terminalis)繁殖生物学及繁殖策略
刘亚秋1,2, 李新辉1,2, 李跃飞1,2, 陈蔚涛1,2, 李捷1,2, 朱书礼1,2
1.中国水产科学研究院珠江水产研究所, 广州 510380;2.农业农村部珠江中下游渔业资源环境科学观测实验站, 广州 510380
摘要:
探究鱼类繁殖策略是了解鱼类种群动态的关键.通过对珠江西江流域重要的经济鱼类广东鲂(Megalobrama terminalis)生殖周期、产卵时间、成熟期长度、生殖力类型和生殖力等方面进行研究,阐明在人类活动日益加强下,西江广东鲂的繁殖策略适应性变化情况.研究表明,广东鲂个体平均体长245 mm,优势体长集中在260~280 mm,平均体重347 g,优势体重集中在320~480 g.用L50逻辑斯谛回归方法推算广东鲂雌鱼和雄鱼初次性成熟体长分别为244.5和232.2 mm.雌雄性比例为1.105:1,且随着体长增加,雌雄性比呈现出先下降后上升的变化趋势.广东鲂繁殖群体在产卵季节为4—8月,产卵高峰为6月初持续到7月上旬,产卵季节内广东鲂鱼苗的密度与径流量显著相关.广东鲂绝对繁殖力平均为73069粒,相对繁殖力平均为118.7粒/g,绝对繁殖力与体长和体重均呈正相关.广东鲂繁殖群体性腺成熟系数与性腺重、肥满度以及体重密切相关.广东鲂种群繁殖策略在人类活动加剧影响下呈现出适应性变化:初次性成熟体长变小,绝对繁殖力下降.
关键词:  广东鲂  繁殖策略  初次性成熟体长  繁殖力  西江  珠江
DOI:10.18307/2021.0117
分类号:
基金项目:广东省基础与应用基础研究基金项目(2019B1515120064)、中国水产科学研究院珠江水产研究所自主科技创新项目(ZC-2019-5)、农业农村部淡水生物多样性保护重点实验室开放课题(LFBC1006)和珠江渔业资源调查与评估创新团队项目(2020TD10,2020ZJTD-04)联合资助.
Reproductive biology and strategy of Megalobrama terminalis of Xijiang River
Liu Yaqiu1,2, Li Xinhui1,2, Li Yuefei1,2, Chen Weitao1,2, Li Jie1,2, Zhu Shuli1,2
1.Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, P. R. China;2.Scientific Observing and Experimental Station of Fishery Resources and Environment in Middle and Lower Reaches of Pearl River, Ministry of Agriculture and Rural Affairs, Guangzhou 510380, P. R. China
Abstract:
Knowing fish reproductive strategy is essential for understanding population dynamics. This study intends to investigate the reproductive cycle, the timing of spawning, length at first maturity, fecundity type and fecundity of Megalobrama terminalis, one of the important commercial fishes in Xijiang River in order to illuminate adaptation of reproductive strategies of M. terminalis with human activity intensifies. The results indicated that the average body length of M. terminalis was 245 mm, dominated body length of fishes concentrated in the 260-280 mm range, while the average body weight of M. terminalis was 347 g, dominated body weight of fishes concentrated in the 320-480 g range. Length at first maturity was estimated as 244.5 and 232.2 mm for females and males, respectively. The ratio of females to males was 1.105 to 1, and with the increase of body length, the ratio of females to males showed a trend of decreasing first and then increasing. The spawning season was from April to August, and the spawning peak was from early June to early July, and the density of M. terminalis larvae had a close relationship with discharge. The average absolute fecundity of M. terminalis was 73069 oocytes, and the average relative fecundity was 118.7 oocytes/g gutted weight. The absolute fecundity was positively correlated with body length and body weight, while gonadosomatic index was closely related to gonadal weight, fatness and body weight. Under the influence of intensified human activities, the adaptive changes of the reproductive strategy of M. terminalis: primary sexual maturity length and the absolute fecundity decreased.
Key words:  Megalobrama terminalis  reproductive strategy  length at first maturity  fecundity  Xijiang River  Pearl River
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