Presenter
Dr. XU Guanbing, Pearl River Water Resources Research Institute
Co-author(s)
Mr. WANG Jianping, Pearl River Water Resources Research Institute
Dr. LIU Cheng, Pearl River Water Resources Research Institute
Mr. LAN Xiaofeng, Pearl River Water Resources Research Institute
Sub-theme
4. Supporting Aquatic Ecosystem Health and Functions
Topic
4-4. Ecological restoration of degraded rivers and lakes
Body
With the rapid economic development along the Pearl River, the number of ships navigation on the Pearl River is gradually increasing, and the ships navigation waves, suspended solids, noise and oil pollution caused by ship navigation have an impact on fish. In order to explore the impact of ship navigation on fish and its scope, it is necessary to carry out experimental research on the impact of ship navigation on fish. The relevant research results can provide theoretical basis and support for the operation evaluation of the Pearl River waterway and ecological protection of the Pearl River Basin. The experiment was carried out in the Pearl River near Shilongnan Bridge, Shilong Town, Dongguan City, Guangdong Province, China. Before the experiment, the experimental cages were placed in the locations of 20~40m, 50~70m, and 80~100m away from the main waterway. Ten healthy experimental fish were placed in the cages for one hour for adaptation. The PIT telemetry system was used to monitor the behavioral responses of fish at different positions during ship navigation, and to analyze the number and behavior of fish through PIT telemetry system to judge the influence of ship navigation on fish. The results show that the acceleration of fish swimming and the number of fish passing through the PIT telemetry system are significantly higher than that of no ship passing when the distance of fish is 20~40m from the ship. When the distance between the experimental fish and the ship was 50~70m and 80~100m, there was no significant difference between the acceleration of the fish and the number of PIT telemetry system passed by the ship. The influence of ship on fish is limited by distance. Ship navigation will prompt fish to escape within a certain distance, and the critical value of this distance is defined as 40~50m. The effect of ship on fish will weaken with the increase of distance.