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Using benthos to evaluate the quality of marine environment: Case study from central Vietnam after the incident caused by formosa

In this study, we evaluated the quality of marine environment in central Vietnam after the disaster caused by Formosa Ha Tinh Steel Corporation (Formosa), using both bio-indicators (benthos) and chemical indicators. Results show that using benthic fauna, especially meiobenthos can obtain data on the quality of marine environment faster and more accurate than using chemical indicators. | Vietnam Journal of Science and Technology 55 (4C) (2017) 155-161 USING BENTHOS TO EVALUATE THE QUALITY OF MARINE ENVIRONMENT: CASE STUDY FROM CENTRAL VIETNAM AFTER THE INCIDENT CAUSED BY FORMOSA Nguyen Thi Minh Phuong*, Nguyen Ngoc Anh, Ngo Quoc Phu Faculty of Environment and Chemical Engineering. Duy Tan University, 3 Quang Trung, Da Nang, Viet Nam * Email: phuong.marine.envi@gmail.com Received: 15 July 2017; Accepted for publication: 20 October 2017 ABSTRACT In this study, we evaluated the quality of marine environment in central Vietnam after the disaster caused by Formosa Ha Tinh Steel Corporation (Formosa), using both bio-indicators (benthos) and chemical indicators. Results show that using benthic fauna, especially meiobenthos can obtain data on the quality of marine environment faster and more accurate than using chemical indicators. In marine environment, monitoring contaminated areas and contamination sources is difficult since currents are normally strong, contaminants often move fast and far away from the sources. For the reasons, using benthos as indicator to localize the contaminated areas as well as assess the quality of marine environment can be an effective method. However, this indicator cannot help to identify the exact contaminants and using this requires a comprehensive knowledge on sea bottom topography, sedimentary characteristics, sea currents, biological competition, etc. Keywords: marine environment, bio-indicators, chemical indicators, benthos. 1. INTRODUCTION On 6th April 2016, the massive fish carcasses were washed up on the coast of Ha Tinh Province and later, dead fishes were found continuously southward to Quang Binh, Quang Tri and Thua Thien Hue Provinces until 18 April 2016. This disaster had negatively affected the marine environment, regional economy and society. It disrupted the livelihood of fishermen and heavily impacted the tourism industry in the whole region. The massive marine life destruction led to a number of protests