Huang Zhenli
China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
iScience. 2019 Sep 27;19:772-785. doi: 10.1016/j.isci.2019.08.029. Epub 2019 Aug 22.
The downriver migration process of young anadromous fish has a far-reaching impact on their survival rate and the efficacy of hatchery-reared fish release, but it is poorly understood. Moreover, the impact of dams on the fish remains unclear. The Chinese sturgeon is an anadromous and dam-affected fish in the Yangtze River. Here, we propose a novel theoretical framework to reveal the migration process of young Chinese sturgeon. We clarify the effects of active swimming of fish and water flow on the downriver migration and the parametric traits of the migrational stages. Then, we show that the young fish migrate downriver along the inshore waters in a gradually transforming manner from passive drift to active swimming. Lastly, we evaluate the impact of the Gezhouba Dam (GD) on the migration of the young fish, as well as demonstrate the life cycles of Chinese sturgeon in the Yangtze River pre- and post-GD.
溯河洄游幼鱼的下游洄游过程对其存活率和人工养殖放流鱼类的效果有着深远影响，但人们对此了解甚少。此外，大坝对鱼类的影响仍不明确。中华鲟是长江中的一种溯河洄游且受大坝影响的鱼类。在此，我们提出一个新颖的理论框架来揭示中华鲟幼鱼的洄游过程。我们阐明了鱼类主动游动和水流对下游洄游的影响以及洄游阶段的参数特征。然后，我们表明幼鱼沿着近岸水域以从被动漂流到主动游动逐渐转变的方式向下游洄游。最后，我们评估了葛洲坝对幼鱼洄游的影响，并展示了长江中葛洲坝修建前后中华鲟的生命周期。
