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1 2011 5, 18(3): Journal of Fishery Sciences of China 研究论文 DOI: /SP.J 李罗新 1,2, 张辉 1,2, 危起伟 1,2, 杜浩 1,2, 洪克明 1. 农业部淡水生物多样性保护重点开放实验室, 中国水产科学研究院长江水产研究所, 湖北荆州 ; 2. 中国水产科学研究院淡水渔业研究中心, 江苏无锡 ; 3. 常熟市渔政管理站, 江苏常熟摘要 : , ( ), (Acipenser sinensis), 5-7, 86.6 d(n=8), (n=8) 25.2~40.1 cm 23.2~33.5 cm 70.7~314.8 g, ,,,,,, 6,,, : ; ; ; 中图分类号 : Q178.1 文献标志码 : A 文章编号 : (2011) (Acipenser sinensis), [1], 7-8,, ( ) ( ) [1 2],, 4-8, [1] 20,, [3] 1989,,, [4],, 200 [5 6], [7],, 197 [1,8 11] , (CWT) 收稿日期 : ; 修订日期 : 基金项目 : ( ); ( ); ( ) ( ); (Z009C004). 作者简介 : (1981 ),,. liluoxin125@163.com 通信作者 :,,. Tel: ; weiqw@yfi.ac.cn

2 [7,12 13], [14 17] 2002,,,, [11,18],, , ,,, m, 750 m, 4 m(, 2.5 m), 16, 4 cm, ( 1), ( ),, 1 Fig. 1 Sketch map showing the sites of monitoring nets , ( 1), (2006 ), 5 20 ( ); 45 d (2006 ), 9 7 (2007 ), 65 d 2004, 117 d; 2002, 55 d, 2003, 718 ; , 20 ; , 2003, 7.80 /d; 2007, 0.18 /d; 8 ( 1), 25.2~40.1 cm, 23.2~33.5 cm, 70.7~314.8 g, cm, ; 74.0 cm, 61.0 cm, g, ,,,, ( , ), 50 d 2.3 ( 2),, , 25.0 cm(n=3) cm(n=6)

3 3 : 613

4 Tab. 2 表年 5 7 月各旬长江常熟溆浦段采获中华鲟幼鱼的数量 Catch numbers of Acipenser sinensis juveniles by monitoring fishing-net at a period of ten days from May to July in at Xupu, Changshu section of Yangtze River year time first 10 days of May second 10 days of May last 11 days of May first 10 days of June second 10 days of June last 10 days of June 7 first 10 days of July 7 second 10 days of July 7 last 11 days of July : ND Note: ND means no data. ND ,, , 18, 18.0~35.0 cm,,,, ,,,,, ( 3), ( ) [10] ( ), 4, 1 (, ) 191~229 d, 39 d Fig.2 Body length and weight of Acipenser sinensis juveniles captured by monitoring fishing-net from 2002 to 2009 at Xupu, Changshu section of Yangtze River [10]

5 3 : 615

6 61 18 year Tab. 4 * spawning date* 表 4 中华鲟幼鱼到达长江口历时时间 Time consumption for Acipenser sinensis juveniles to arrive at Yangtze estuary time of first specimen capture at the estuary next year , , duration of maximum sampling at the estuary next year first 10 days of June last 11 days of May second 10 days of May second 10 days of June second 10 days of June last 11 days of May last 10 days of June first 10 days of June : * 1 (, ); ** /d** days between maximum sampling date and spawning date** Note: * use the first spawning date to calculate the time consumption (Wei et al, unpublished data); ** in each month use the date of 5, 15 and 25 to calculate the time consumption ,, 5-9,, ( 3),, 6, , [9],, 1,, [13,18], cm, g,, ( cm ),, [18],,, ( 3), 2 : (1),,,, ;,, (2) ,,, 4-8, ( ) [19 21], [12], [18] 2002,,

7 3 : , 2002, 3 ( ), 20~45, ( 1), 3.3, km ( 4),, 2 d,, 3~8 5 d,, 2 2, [22 23], 8 d, 2 2,, ( ),, (4 6 ),, [19 21] 致谢 : 参考文献 : [1] [M] :, 1988: [2] [M] :, 2007: [3] Wei Q, Ke F, Zhang J, et al. Biology, fisheries, and conservation of sturgeons and paddlefish in China [J]. Environ Biol Fish, 1997, 48: [4] Gao X, Brosse S, Chen Y, et al. Effects of damming on population sustainability of Chinese sturgeon, Acipenser sinensis: evaluation of optimal conservation measures [J]. Environ Biol Fish, 2009, 86: [5] Qiao Y, Tang X, Brosse S, et al. Chinese sturgeon (Acipenser sinensis) in the Yangtze River: a hydroacoustic assessment of fish location and abundance on the last spawning ground [J]. J Appl Ichthyol, 2006, 22(Suppl. 1): [6],,, [J], 2009, 2(2): [7] [D] :, 1999: [8] [M]// :, 1988: [9],, [J], 1986 (6): [10] [J], 1994 (1): [11],,, [C]// CNPPA/IUCN 41 :, 1994: [12],,, [J], 2005, 29(1): [13] Zhu B, Zhou F, Cao H, et al. Analysis of genetic variation in the Chinese sturgeon, Acipenser sinensis: estimating the contribution of artificially produced larvae in a wild population [J]. J Appl Ichthyol, 2002, 18: [14],,, [J], 2005, 27(3): [15],,, [J], 2007, 26(8): [16],,, [J], 2008, 19(1): [17],,, [J], 2008, 27(6): [18] [D] :, 2003: [19] (Acipenser sinensis Gray) [J], 1991, 6(4): [20], [J], 1993 (2): [21], 13 [J], 2001 (5): 22 23, 25 [22] [D] :, 1999: [23] Zhuang P, Kynard B, Zhang L, et al. Ontogenetic behavior and migration of Chinese sturgeon, Acipenser sinensis [J]. Environ Biol Fish, 2002, 65:

8 Occurrence time and amount variation of juvenile Chinese sturgeon, Acipenser sinensis at Xupu, Changshu section of Yangtze River after closure of Three Gorges Dam LI Luoxin 1,2, ZHANG Hui 1,2, WEI Qiwei 1,2, DU Hao 1,2, HONG Keming 3 1. Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi , China; 2. Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture; Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Jingzhou , China; 3. Changshu Fishery Supervision Station, Changshu , China Abstract: Chinese sturgeon Acipenser sinensis, a large anadromous species, mainly distributes in the continental shelf of the East China Sea and the main steam of Yangtze River. From July to August in each year, the pre-spawning individuals enter into the Yangtze estuary. Then they go against the water flow and will spawn in autumn of next year. The spawning locus is about km away form the Yangtze estuary. After hatching, the yolk-sac larvae go downstream with the water flow and will arrive at the estuary in April and August of next year. Xupu, Changshu, a place at the Yangtze estuary, is a good site to monitor A. sinensis juveniles. So in years from 2002 to 2009, by a fixed stow net (set by the Yangtze Fishery Resources Commission for fishery monitoring) set in this site, we investigated the resources of A. sinensis juveniles. It was indicated that the emergence of the fish at Xupu, Changshu mainly occured from May to July, with the average period being 86.6 days (n=8). The ranges of annual (n=8) average total length, body length and body weight were cm, cm and g, respectively. The numbers of specimens captured in each year were very different, and a decreasing trend occurred from the year 2002 to The periods (ten days as a unit) with maximum sampling number were also different, which ranged from the second ten days of May to the last ten days of June. The sizes of the juveniles were very different in the same period of different year, and the sizes of the specimens captured in the same year and same date also showed difference. Compared with the study in the four years (1987, 1990, 1991 and 1992) before the closure of the Three Gorges Dam, the time range that juveniles arrived at the Yangtze estuary showed no obvious difference(p>0.05). However, the occurrence proportion in each ten days during the time from May to July varied. The high occurrence proportion was mainly in June before the closure, but after the closure it also occurred in May. The size of the juveniles was also different from pre-closure. It was speculated that the difference was caused by artificial enhancement and releasing, and variation of hydrological regime. Hydrological condition was an important factor influencing the time consumption for the fish to migrate from spawning area to the Yangtze estuary. Key words: Acipenser sinensis; juvenile; resource; Yangtze estuary Corresponding author: WEI Qiwei. weiqw@yfi.ac.cn

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