Abstract
On the basis of field data measured during four cruises from January to November 2007, variations in the characteristics of dissolved inorganic nitrogen and phosphate were analyzed in Nansha marine fish cage culture area, Ningbo City, China. Dissolved inorganic nitrogen (DIN) was selected as the parameter to balance seaweed absorption and fish DIN production. The contents of DIN and phosphate varied with different seasons, and eutrophication index (E) value ranged from 2.41 to 15.99, indicating serious eutrophication conditions; the annual average value of N/P of 32.95 indicates a nitrogen surplus in this system. The eutrophication condition in Nansha Bay was mainly caused by the fish cage culture activities. Based on their biological characteristics, Laminaria and Gracilaria were selected as the bioremediation species in winter and spring and summer and autumn, respectively. The optimal co-cultivation proportion of fish cage to Laminaria and Gracilaria in this bay was 1 cage, 450 m2 and one cage, 690 m2, respectively.
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This work was supported by the National Basic Research Program of China (grant no. 2006CB400608) and the National High Technology Research and Development Program of China (grant no. 2006AA100304). The authors were grateful to Prof. Shi Huixiong and Mr. Jiao Haifeng of Ningbo Academy of Ocean and Fishery for their cooperation along this work and also to the very constructive comments by several reviewers.
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Jiang, Z.J., Fang, J.G., Mao, Y.Z. et al. Eutrophication assessment and bioremediation strategy in a marine fish cage culture area in Nansha Bay, China. J Appl Phycol 22, 421–426 (2010). https://doi.org/10.1007/s10811-009-9474-1
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DOI: https://doi.org/10.1007/s10811-009-9474-1