長江所瀕危魚類保護組科研人員經過4年的研究，首次全面闡明了中華鱘繁殖群體在長江中完整的生殖洄游過程，并針對研究成果提出了長江中華鱘繁殖群體保護需采取的具體措施。掌握中華鱘的洄游節律和可能誘發洄游的因素有利于開展中華鱘的全江段保護，也能為人類活動（如三峽大壩蓄水）對中華鱘生殖洄游的影響提供參考依據和作出相應預測。研究論文被刊登在著名的魚類學期刊《Journal of Fish Biology》上，并于Wiley數據庫在線發表。



Abstract: From 2006 to 2009, 27 ultrasonic-tagged wild adult Chinese sturgeon Acipenser sinensis [eight males, 19 females; total length (LT) range = 245–368 cm] were captured on the spawning ground just downstream of Gezhouba Dam (GZD) in the Yangtze River. Twenty-six individuals were tracked for 7 to 707 days (mean number of relocations = 859; range = 3–4549). Acipenser sinensis movements were divided into four categories: (1) spawning migration, two tagged A. sinensis (one female and one male) returned to the Yangtze River and migrated from the Yangtze Estuary (river kilometer, rkm, 0) to the spawning ground (1678 rkm) between June and October. Their mean upstream ground speed was 1?41 km h?1 (range = 0?26–2?35 km h?1). The speed of the male was faster than the female; (2) pre-spawning holding, four of five females tagged in November 2008 stayed within 1678?00–1674?15 rkm for c. 1 year before the spawning period; (3) spawning movements, all A. sinensis swam mostly from the tailrace of the GZD (1678 rkm) to the Miaozui (1674?15 rkm) reach and some moved downstream c. 18?21 rkm (range = 3?93–24?64 rkm), but then, returned upstream to the GZD. Most tagged A. sinensis were on the spawning ground on the day when the spawning occurred; (4) post-spawning migration males (n = 6) and females (n = 2) departed the spawning area on a different time schedule, females leaving before males. The mean seaward ground speed of six A. sinensis was 4?87 km h?1 (range = 0?68–7?60 km h?1). There were no significant differences (P >0?05) in ground speeds among reaches or between sexes within reaches between telemetry receivers. These broad spatiotemporal scale results will help establish an effective protection strategy for the species in the Yangtze River.
摘要翻譯：2006-2009年，我們對27尾野生中華鱘進行了超聲波遙測。其中，定位時長范圍為7~707天，平均定位859次/尾。標志魚在長江中的完整洄游可分為4種階段類型：（1）溯河生殖洄游（Spawning migration）。兩尾超聲波標志中華鱘（1尾雌魚、1尾雄魚）分別于6月和10月從海中到達長江口并溯河洄游，其中一尾到達葛洲壩下產卵場（rkm 1678），溯河洄游速度分別為0.54 km/h（0.26~1.77 km/h）和2.20 km/h（1.82~2.35 km/h），雄魚的速度大于雌魚。（2）產前棲息（Pre-spawning holding）。2008年秋季標志的4尾III期中華鱘在葛洲壩至廟咀約3.85 km的江段長期停留直至第2年的產卵期。（3）產卵遷移（Spawning movements）。所有的標志魚大部分時間都集中在大江電廠尾水區至廟咀江段洄游，其中，大部分魚都會在產卵日到來前向下游遷移平均距離約18.21 km（3.93~24.64 km）后再返回葛洲壩下產卵場。產卵發生時，多數魚都出現在產卵位點。（4）產后降河洄游（Post-spawning migration）。雌魚和雄魚表現出了不同的離開產卵場時間的特征。產卵結束后，雌魚立即離開，雄魚則在產卵場停留較長時間再行降河洄游。平均降河速度為4.87 km/h（0.68~7.60 km/h），并且在不同江段以及性別之間沒有顯著性差異（P = 0.56 > 0.05和P = 0.69 > 0.05）。研究結果有助于為長江物種建立一種有效的保護措施。