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Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (28): 155-164.doi: 10.11924/j.issn.1000-6850.casb2025-0031

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Water Quality Monitoring and Evaluation of Aquaculture Ponds in Lianyungang Area

WANG Zhengwei1(), YU Fei1(), YANG Cheng2, LU Jikun1, JIANG Shanshan2, SUN Yuqi2, GAO Huan2   

  1. 1 Lianyungang Marine and Fishery Development Promotion Center, Lianyungang, Jiangsu 222001
    2 Jiangsu Provincial Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang, Jiangsu 222005
  • Received:2025-01-10 Revised:2025-05-12 Online:2025-10-05 Published:2025-10-10

Abstract:

In order to evaluate the water quality condition of aquaculture ponds in Lianyungang area, this study sampled and analyzed the source water, pond water and tailwater of nine freshwater aquaculture ponds and four seawater aquaculture ponds from May to December 2022, with a focus on the physicochemical indexes of aquaculture ponds and the trend of change. This study adopted the single-factor pollution index method and the Nemerow comprehensive pollution index method to assess the degree of pollution of pond water and tail water in the aquaculture ponds systematically. The monitoring results indicated that the concentration of dissolved inorganic nitrogen (DIN) in the pond water of seawater aquaculture ponds was higher from May to July, while the concentration of dissolved inorganic phosphorus (DIP) reached its peak in August. The concentration of total nitrogen (TN) in pond water from freshwater aquaculture ponds were higher overall, and ammonia nitrogen (NH4+-N) was higher in May, and the concentration of total phosphorus (TP) increased significantly from August to October. The analysis of tailwater quality indicated that the main pollutant in the tailwater of the seawater aquaculture ponds was DIN, and the concentration of DIN in 50.0% of the tail water exceeded the secondary discharge standard of Jiangsu Provincial Discharge Standard of Water from Aquaculture Ponds; the main pollutants in the tailwater of the freshwater aquaculture ponds were NH4+-N and TN, with the proportions of the tailwater exceeding the secondary discharge standard being 25.0% and 37.5% respectively. Based on the Nemerow comprehensive pollution index evalution, 37.5% of the pond water in seawater ponds and 50.0% of the pond water in freshwater ponds were at moderate and severe pollution levels. Overall, 75.0% of the surveyed ponds aquaculture tailwater was relatively clean, with the overall quality condition being good.

Key words: Lianyungang, aquaculture ponds, water quality, single-factor pollution index, Nemerow comprehensive pollution index