The Yangtze sturgeon (Acipenser dabryanus) is a most important aquatic animal at the national level. Influenced by human activities such as dam constructions and overfishing, its natural population in the wild has almost disappeared. Since 2000, its natural reproduction has not been detected. In May 2018, in the Yibin reaches of the upper Yangtze River, 40 adult hatchery reared Yangtze sturgeons with their gonads at or above stage III, body length ranging from 92 to 146 cm were ultrasonically labeled and released. Results of fixed station and mobile surveys showed that only one individual did not receive ultrasonic signals. Our study indicated that: (a) In terms of longitudinal migration along the river, most individuals were mainly distributed in the main section of the downstream Jinsha River below Xiangjiaba Dam after releasing, except one individual conducting a relatively long‐distance migration; (b) Compared with the released juvenile fish which performed a descending migration, adult Yangtze sturgeons preferred an anadromous migration and a settled life in the wild; (c) The habitat water depth of the released Yangtze sturgeons ranged from 0.61m to 27.74 m with the mean value of 8.65 ± 3.89m (mean ± standard deviation). There was a significant difference in daytime and nighttime habitat water depths (p < .01), and the average habitat water depth in daytime was significantly lower than that at night. In this study, ultrasonic telemetry was used to quantitatively assess the migration and spatial distribution of the released adult Yangtze sturgeons for the first time. Our results would provide a scientific basis for the subsequent reconstruction and restoration of the wild populations and future stock enhancement.

中文翻译：

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扬子江上游放养的成年孵化扬子Yangtze（Acipenser dabryanus）的迁移和分布及其对种群增加的影响

扬子urge（Abrcener dabryanus）是国家一级最重要的水生动物。受大坝建设和过度捕捞等人类活动的影响，其自然野生种群几乎消失了。自2000年以来，尚未发现其自然繁殖。2018年5月，在长江上游宜宾河段，对40个成年孵化场孵化的Yangtze鱼进行了性腺检查，并检测了其性腺处于III期或更高的阶段，体长在92至146 cm之间。固定站和移动调查的结果表明，只有一个人没有收到超声波信号。我们的研究表明：（a）就沿河的纵向迁移而言，大多数个体在释放后主要分布在向家坝水坝下方的金沙江下游主要段，一个人进行相对长距离的迁徙；（b）与放行的幼鱼相比，它们的繁殖力呈下降趋势，长江成年ons鱼更喜欢在野外进行适当的迁徙和定居的生活；（c）释放的长江st鱼的栖息水深在0.61m至27.74m之间，平均值为8.65±3.89m（平均值±标准偏差）。白天和晚上的栖息地水深差异很大（p  <.01），并且白天的平均栖息地水深明显低于夜间。在这项研究中，超声遥测技术首次用于定量评估释放的成年扬子st的迁移和空间分布。我们的结果将为野生种群的后续重建和恢复以及未来种群的增加提供科学依据。