摘要
2014年3月至2016年9月在长江中下游宜昌江段共收集鲢(Hypophthalmichthys molitrix)样本433尾,进行繁殖生物学研究。该江段鲢的繁殖时间为每年的5月下旬至8月上旬,以6~7月为盛产期。繁殖群体体长310~927 mm,体重600~17 090 g,由3~7龄共5个年龄组组成,3龄群体数量上占绝对优势,占繁殖群体的45.2%。雌雄性比为1.43︰1,雌雄群体间体长-体重关系存在显著性差异(0.01<P<0.05)。采用Logistic方程推算出初次性成熟雌性个体体长为482.3 mm,体重为2 206.7 g;初次性成熟雄性个体体长为484.0 mm,体重1 677.5 g。卵径(1.01±0.12)mm,大小分布呈单峰型,为单批产卵型鱼类。绝对繁殖力(477 662±9 631)粒,相对繁殖力为(93.38±5.92)粒/g,绝对繁殖力随着鱼体长、体重增长而增大。与其他地理种群相比较,宜昌江段鲢总体表现为卵径相对较小而繁殖力较大。
In order to study reproductive characteristics of Hypophthalmichthys molitrix, 433 samples were collected at the Yichang section in the Yangtze River during March 2014 to September 2016. The data for standard length, body weight, net body weight and gonad weight of each specimen, and eggs′ diameter of 10 females in Ⅳ stage were measured. Egg diameters were measured with the Image-Pro Plus 6.0 software. The gonads′ stage was divided into six stages according to the method of YIN Ming-Cheng （1995）. Statistic analysis of all data were taken by Microsoft excel 2007 and SPSS 16.0. The results proved that females spawned from May to August, peaked in June and July. The age of reproductive group consisted of 3, 4, 5, 6 and 7 years, while those at 3 years were consisted a highest percentage. The sex-ratio of females to males was 1.43︰1 （χ2, P 〈 0.01）. A significant differences were found between males and females by the body length to body weight equation （0.01 〈 P 〈 0.05, Fig. 2）. The Logistic equation was used to calculate the characteristics of the first maturity and found out the minimum size of mature female was 482.3 mm in length and 2 206.7 g in weight, while that of mature male was 484.0 mm in length and 1 677.5 g in weight （Fig. 3）. The average egg-diameter in ovary at stage Ⅳ was from 0.57 to 1.332 mm （average 1.01 ± 0.12 mm） and the distribution of eggs diameter showed a one peak curve （Fig. 6）. H. molitrix belonged to total spawners based on the gonadosomatic index curve （Fig. 5） and the distribution of the diameter of mature eggs. The absolute fecundity ranged from 102 351 to 767 200 eggs （average 477 662 ± 9 631 eggs） and the relative fecundity per gram ranged from 44.89 to 139.75 eggs （average 93.38 ± 5.92 eggs）. The absolute fecundity was power correlated to body length and body weight （Fig. 4）. Contrary to the reproductive population of fish in other section of Yangtze River, the average egg-diameter of H. molitrix was relatively smaller, but th
作者
郜星晨
姜伟
白云钦
朱佳志
张琪
刘绍平
段辛斌
唐锡良
GAO Xing-Chen1,2 JIANG Wei1,2 BAI Yun-Qin1,2 ZHU Jia-Zhi1,2 ZHANG Qi1,2 LIU Shao-Ping3 DUAN Xin-Bin3 TANG Xi-Liang4(1 Chinese Sturgeon Research Institute, China Three Gorges Corporation, Yichang 443100; 2 Hubei Key Laboratory of Three Gorges Project for Conservation of Fishes, Yichang 443100; 3Scientific Observing and Experimental Station of Fishery Resources and Environment in the Upper and Middle Reaches of Yangtze River, Ministry of Agriculture, Yangtze River Fishery Resources Institute, Chinese Academy of Fishery Sciences, Wuhan 430223; 4China Three Gorges Projects Development Ltd., Chengdu 610000, Chin)
出处
《动物学杂志》
CAS
CSCD
北大核心
2018年第2期198-206,共9页
Chinese Journal of Zoology
基金
农业部长江中上游渔业资源环境科学观测站资助项目
关键词
鲢
繁殖特征
繁殖力
繁殖期
宜昌江段
Hypophthalmichthys molitrix
Reproduction biology
Fecundity
Breeding season
The Yichangof the Yangtze River
