Author(s): Luhai Wang; Zhenli Huang
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Keywords: No Keywords
Abstract: The Chinese sturgeon, Aciperser sinensis, is a large-size anadromous fish and spends most of its life in the East China Sea and adjacent sea areas. The spawners of this endangered fish move upriver to the upper reaches of the Yangtze River and spawn after a 15-month trip[1]. Understanding dynamics of spatial- temporal distributions of fish is a basis to reveal relationship between dam and fish[2]. Telemetry was widely used to study fish migration and environmental changes[3-5], but migration dynamics models enabling to elucidate this mechanism were even less to be found due to inherent difficulties. The spatial and temporal distributions of Chinese sturgeon in the Yangtze River are unsolved mysteries except for scattered and fragmented information. On 4 January 1981, the first key water project on the Yangtze River, Gezhouba Dam (GD) started the river closure, ever since blocked the migratory path of the Chinese sturgeon to the Jinsha River and shortened its migration distance by 1,175 km. However, the spawners bred in the new spawning ground below the Dam, causing a hot dispute over whether and by how much the Dam may have influenced the Chinese sturgeon. In this study, we first propose a Migration Dynamics Model (MDM) to simulate the migratory distribution pattern of Chinese sturgeon in the Yangtze River through a new non -linear convection–diffusion equation (Eq. 1), which consider the fish as active organisms rather than passive bodies.
Year: 2018