Ecological Efficiency of the Mussel <i>Hyriopsis cumingii</i> (Lea, 1852) on Particulate Organic Matter Filtering, Algal Controlling and Water Quality Regulation
Xiaobo Yu | Qinglin Yang | Zhe Zhao | Xiaoqi Tang | Bo Xiong | Shengqi Su | Zhengli Wu | Weizhi Yao
<i>Hyriopsis cumingii</i> plays an important role in aquatic ecosystems and fishery economy due to its potential value for water purification and edibleness. The present study was undertaken to reveal the short- and long-term purifying effects of <i>H. cumingii</i> on pond water. The short-term experiment results showed that total suspended solids, particulate organic carbon, and fatty acid in water were significantly eliminated by <i>H. cumingii</i>, with average percentage of filtering effect respectively reaching 22.19%, 57.48%, and 21.00% in the high-density group. Analogously, <i>H. cumingii</i> could significantly reduce phytoplankton biomass, species number, density, and chlorophyll-a concentration, especially in the control of diatoms, green algae, and cyanobacteria. Besides, electric conductivity also was significantly reduced by <i>H. cumingii</i> and its variation tendency showed a typical density-dependent effect. Similar purification effects were observed in chemical oxygen demand (COD), total nitrogen, and total phosphorus. In the long-term monitoring test, <i>H. cumingii</i> has also shown positive effects on the water transparency and the control to phytoplankton and COD in recirculating aquaculture pond. Overall, <i>H. cumingii</i> showed excellent ecological function, and the mixed breeding density of shellfish in the recirculating aquaculture pond is worth further exploration.
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