Pollution and biological invasions in the Bohai Sea continue to worsen. Monitoring data shows that microplastic levels in the surface waters of the Bohai Sea have risen by 18% year-on-year, with the primary sources of pollution being shipping operations, discarded fishing nets, and domestic sewage. In addition, ballast water from ships has introduced large numbers of invasive jellyfish and algae, crowding out native fish and leading to a significant decline in fishery resources in some areas.
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