| 英文摘要 |
The spread of invasive alien species poses serious threats to freshwater ecosystems worldwide. Longluan Lake, a critical wetland in Kenting National Park, Taiwan, has been increasingly impacted by non-native fish species, including Channa striata, Oxyeleotris marmorata, and Oreochromis spp., which disrupt the native biodiversity and ecological balance. To enhance management efficiency, electrofishing was introduced in 2020 as a supplementary removal method alongside traditional techniques, including lure fishing, longline fishing, and fyke netting. Between 2020 and 2024, a total of 20 removal events were conducted, resulting in the capture of 18,677 individuals, of which 13,654 were non-native species. Electrofishing substantially increased capture rates of small-bodied and juvenile invasive fishes, with annual averages of C. striata and O. marmorata rising more than fourfold compared to pre-2020 levels. Notably, the mortality rates associated with electrofishing (9.2%) were also lower than those of fyke nets (32.8%), indicating reduced ecological disturbance to native species. Abundance Biomass Comparison (ABC) curve analyses revealed declining W values for key invasive species and partial recovery of native assemblages after the introduction of electrofishing. Our findings demonstrate that electrofishing, when integrated with conventional fishing methods, provides an effective and ecologically sustainable approach for managing invasive fish in wetland ecosystems. |
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