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Marine Pollution Bulletin
Vol. 95, No. 1, 2015; Pages: 289 - 296

Bioremediation efficiency of the largest scale artificial Porphyra yezoensis cultivation in the open sea in China

Hailong Wu, Yuanzi Huo, Jianheng Zhang, Yuanyuan Liu, Yating Zhao, Peimin He

College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai 201306, China.

Abstract

The bioremediation efficiency of China’s largest scale Porphyra yezoensis cultivation for removing dissolved nutrients and controlling harmful algae was studied in the radial sandbanks waters of Jiangsu Province in the year 2012–2013. Mean nutrient concentration values in the P. yezoensis cultivation area were significantly lower than those in the non-cultivation area, especially during the cultivation season (p < 0.05). Tissue nitrogen and phosphorus contents of seaweeds were 5.99–0.80% (dry weight (DW)) and 0.16–0.19% (DW), respectively. Production of P. yezoensis was 58950.87 tons DW. Based on these values, 3688.15 tons of tissue nitrogen and 105.61 tons of tissue phosphorus were removed by harvestingP. yezoensis. The richness index of the red tide species Skeleton emacostatum declined from 0.32 to 0.05 during the P. yezoensis cultivation season. These results indicate that large-scale cultivation of P. yezoensis can be used to efficiently alleviate eutrophication and control harmful algae blooms in open sea.

Keywords: Porphyra yezoensis; Bioremediation; Eutrophication; Red tide


 
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