Study on Habitat Simulation and Substrate Rehabilitation Techniques for Spawning Grounds of Schizothorax prenanti
Human activities such as hydropower projects have disrupted river connectivity,altered topography and sediment characteristics,and may lead to the destruction of local fish spawning habitats.This research constructed a suitable evaluation model for spawning grounds of Schizothorax prenanti,which integrated flow velocity,water depth,and substrate habitat requirements.The changes in riverbed roughness under different substrate restoration schemes were determined through flume experiments,and the model was validated using flow velocity verification method.The results indicated that the fish spawning ground model established in this research can effectively simulate the hydrodynamic conditions and WUA distribution of spawning grounds.The simulation results of habitat conditions after substrate rehabilitation in the spawning ground of Schizothorax prenanti showed that when the substrate index was 60％,the WUA of Schizothorax prenanti under three flow conditions increased from 343.0～536.2m2 to 1225.2～2019.1 m2,compared with previous rehabilitation.The proportion of WUA increased from 3.0％～5.9％to 10.7％～22.5％,indicating a significant improvement.This research achievement can provide scientific basis and reference for habitat simulation and substrate rehabilitation plans of fish spawning grounds.
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