Yangtze River fishing ban halts 70 years of freshwater biodiversity decline

(Press-News.org) China’s Yangtze River – in ecological decline for decades – is showing early signs of recovery following the introduction of a sweeping 10-year commercial fishing ban, researchers report. According to the findings, fish biomass has more than doubled, endangered species are rebounding, and the world’s largest river system may be beginning a cautious ecological comeback. Rapid economic development in China since the 1950s has resulted in severe declines in freshwater biodiversity in the Yangtze River, the largest and longest river in China. This was largely due to decades of overfishing and habitat degradation. Despite massive investments in conservation and improved water quality, biodiversity has continued to erode, raising doubts about the effectiveness of conventional restoration efforts. In response, China enacted an unprecedented 10-year fishing ban across the entire Yangtze basin in 2021, coupled with strict enforcement and broad environmental management.

 

Here, Fangyuan Xiong assess the outcomes of these policy interventions. Xiong et al. evaluated fish communities in the Yangtze habitats before and after the fishing ban, using data from 2018 to 2023 to compare fish biomass, body condition, species diversity, and the presence of threatened species. The findings show that the Yangtze River is showing early signs of ecological recovery following the implementation of the fishing ban, with fish biomass more than doubling and species richness modestly increasing. The recovery has been especially pronounced among larger-bodied and higher-trophic level species, which are more abundant and healthier than before. Moreover, several endangered and migratory species – as well as the critically endangered Yangtze finless porpoise – also show population rebounds. While the fishing ban emerged as the single most important driver of improvement, complementary measures, such as water quality enhancement, hydrological regulation, and land-use management, also played critical roles. Together, the findings suggest that large-scale fishing bans can catalyze rapid ecological improvement, but lasting biodiversity recovery will depend on sustained, integrated watershed management that addresses the full suite of human pressures on river systems. “The results reported in this study … provide hope that in an era of global biodiversity decline, ambitious political decisions that support large-scale restoration efforts can help reverse the ecosystem damages of the past and lead to a brighter future…,” Xiong et al. write.

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