China's Bohai Bay oyster reefs show recovery, with 286 oysters per square metre

Four years after researchers began studying the restoration of oyster reefs in China's Bohai Bay, the newly created habitats are showing signs of recovery. A survey conducted in March 2026 found an average of 286 oysters per square metre on artificial reefs. The amount of suspended material in the surrounding water was also about 62% lower than it had been before the restoration work began.The findings come from a study by Chang Liu and fellow researchers, published in Frontiers in Marine Science. Their work followed changes in marine life and water conditions at Dashentang, near Tianjin, from 2022 to 2026.The reduction in suspended particles was among the changes recorded during this period. In May 2022, researchers measured an average of 19.3 milligrams of suspended particulate matter per litre of water. When they returned in March 2026, the figure was 7.28 milligrams per litre. Suspended particulate matter includes fine sediment and other small particles carried in the water.Although oysters can remove particles from water as they feed, the study does not establish that they caused this decline. The researchers did not directly measure the oysters' filtration activity, and chang...