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| Impact of Marine Ranching on Spatial Distribution of Fish Resources in South Sea Area of Yintan in Beihai, Guangxi |
| YU Jie1,2, ZOU Jianwei3, CHEN Guobao1,2 |
1. South China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences, Guangzhou 510300, China;
2. Key Laboratory of Marine Ranching,Ministry of Agriculture and Rural Affairs/National Digital Fisheries (Marine Ranching) Innovation Sub-Center/Scientific Observing and Experimental Station of South China Sea Fishery Resources and Environments,Ministry of Agriculture and Rural Affairs/Guangdong Provincial Key Laboratory of Fishery Ecology and Environment/Guangdong Provincial Key Laboratory of Fishery Ecology and Environment/Guangdong Engineering Technology Research Center of Marine Recreational Fishery,Guangzhou 510300, China;
3. Beihai Fishery Technology Extension Station,Beihai 536000, China |
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Abstract To evaluate the ecological effects of marine ranching on fish resources,bottom trawl surveys were conducted in three habitats including reef zone (west artificial reefs adjacent to the sea),transition zone, and control zone in the National Marine Ranching Demonstration Area off Yintan, Beihai City,Guangxi in spring (April 2022) and winter (January 2023). Results showed that there was higher fish species richness (35 species in spring, and 39 in winter) in the artificial reef zones than those in the transition zone and control zone, as 1.06—1.08 times and 1.52—1.86 times as those in the transition zone and control zone, respectively. Paerargyrops edita and Leiognathus ruconius served as common dominant species across seasons,complemented by L. brevirostris and Trachurus japonicus in spring, and Acanthopagrus schlegelii, Konosirus punctatus,and Chaeturichthys stigmatias in winter. The Shannon-Wiener index peak was observed in the reef zone during spring (H′=1.91) and the transition zone during winter (H′=2.97), with biomass density gradient from the artificial reef zone to control zone: 709.71→370.29 kg/km2 (spring) and 832.96→305.57 kg/km2 (winter). Notably,winter number density in the reef zone (30.12×103 ind./km2) was shown to be significantly exceeded that in the adjacent zones. The finding confirms that artificial reefs significantly enhance fish aggregation, which contributes to resource restoration through targeted habitat modification.
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Received: 03 April 2025
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