ASSESSMENT OF WATER QUALITY AT FISH CAGES IN THE NORTH OF VIETNAM

Date Received: 02-07-2025

Date Published: 02-07-2025

##submissions.doi##: https://doi.org/10.31817/tckhnnvn.2013.11.7.

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Issue: Vol. 11 No. 7 (2013)

Section:

TÀI NGUYÊN VÀ MÔI TRƯỜNG

How to Cite:

Thu, T., Son, L., Long, N., Ha, D., & Luan, T. (2025). ASSESSMENT OF WATER QUALITY AT FISH CAGES IN THE NORTH OF VIETNAM. Vietnam Journal of Agricultural Sciences, 11(7). https://doi.org/10.31817/tckhnnvn.2013.11.7.

ASSESSMENT OF WATER QUALITY AT FISH CAGES IN THE NORTH OF VIETNAM

Tran Quang Thu , Le Tuan Son (*) , Nguyen Tien Long , Doan Thu Ha , Tran Van Luan

  • Tác giả liên hệ: [email protected]

    • Keywords

    Fish cages, Hai Phong, Quang Ninh, The Risk Quotient (RQ) method

    Abstract


    Marine fish cages in the north of Vietnam contribute to the growth of the local economy. However, these areas are facing with the risk of environmental pollution and ecosystem degradation which can cause the outbreaks of fish disease. We investigated water quality at fish cages in Hai Phong city and Quang Ninh province, areas representative for the impacts of human activities and aquaculture in the north of Vietnam. The Risk Quotient (RQ) method was used as an indicator of pollution over a seven year period, from 2005 to 2012. DO concentration in ​​Quang Ninh province and Hai Phong city decreased significantly from 2005 to 2012. Some areas with high density of fish cages, such as Ben Beo, Tung Gau (Hai Phong) and Kenh Ba Men, Cua Van (Quang Ninh), often had low levels of DO (<5.0 mg/l). From 2008 to 2012, the nutrient concentrations increased significantly, especially N-NH4 and N-NO3. Concentrations of heavy metals (Cu, Pb, Cd and Zn) increased significantly from 2005 to 2012. The RQtt value based on the Vietnamese environmental standards was found to be below the environmental safety (RQtt <0.75) in both regions, however, high levels of pollution were still found in areas of high density of fish cages, such as Cua Van-Quang Ninh. Based on the ASEAN standard, the RQtt values for both areas were above the environmental safety, highlighting the risk of disaster and environmental impacts on aquatic farming activities.

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