Experimental Study on the Response Mechanisms of Drift Egg Transport and Adhesive Egg Hatching to Reservoir Impoundment in the Lower Jinsha River
2025
Lekui Zhu | Wenchao Li | Dong Chen | Yiheng Gao | Rui Han
Understanding the impoundment effects of cascade reservoirs on fish reproduction is essential for the conservation and management of river ecosystems. Using the lower Jinsha River as an eco-hydraulic reference, this study conducted laboratory experiments to investigate how hydrodynamic&ndash:microtopography interactions influence the near-bed transport of drifting fish eggs and how sediment deposition affects the hatching success of adhesive demersal eggs. A predictive formula for near-bed egg drift was established, and a novel threshold for near-bed drift was proposed. In a separate set of experiments, sediment deposition was found to significantly reduce the hatching success of adhesive demersal eggs&mdash:specifically Schizothorax prenanti and Procypris rabaudi&mdash:primarily by decreasing dissolved oxygen levels (p <: 0.05). These findings provide a scientific basis for improving reservoir operation strategies and mitigating the ecological impacts of sedimentation on fish reproduction in impounded rivers.
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