Shrimp farming has significantly contributed to the economic development of Vietnam. However, it has also raised environmental pollution concerns. Previous research shows that effluents from Vietnamese shrimp farms have polluted surrounding waters and adversely affected the farmed shrimp’s health. Knowledge on the impacts of the farming effluents on natural aquatic resources is limited in the country. The current study focuses on the impacts of water pollution derived from shrimp farms on natural fish community. Fieldwork was conducted in Can Gio, Ho Chi Minh City, Vietnam, from May 2005 to April 2006. Water and fish samples were collected from main streams at three different areas: area 1 (A1- with mainly improved-extensive-farms), area 2 (A2- concentrated with intensive and semi-intensive farms) and area 3 (A3- with almost semi-intensive and rice-shrimp rotating systems). Key water quality parameters including dissolved oxygen (DO), un-ionized-ammonia (NH3-N), nitrite (NO2-N), chemical oxygen demand (COD) and biochemical oxygen demand (BOD5); and fish biodiversity were compared among the three areas. The results show that there were statistically significant differences in water quality parameters among the three areas. Clear evidence of water pollution was found at A2 and A3. While DO at A2 and A3 were lower than Vietnamese standard, NO2-N, NH3-N, BOD5, and COD at these two areas exceeded the Vietnamese limits. A lower number of fish species observed at A2 and A3 compared to A1 suggests a relationship to water pollution. The study would help to raise environmental awareness among the local shrimp farmers and government leading to more sustainable farming systems and environmental protection.
|Keywords:||Water Pollution, Shrimp Farming, Fish Biodiversity, Can Gio, Vietnam|
PhD Researcher, School of Environmental & Life Sciences, Centre for Sustainable Use of Coasts and Catchments, University of Newcastle Australia, Ourimbah, New South Wales, Australia
Senior Lecturer & Deputy Head, Centre for Sustainable Use of Coasts and Catchments, School of Environmental & Life Sciences, University of Newcastle Australia, Ourimbah, New South Wales, Australia
Lecturer, School of Environmental & Life Sciences, Centre for Sustainable Use of Coasts and Catchments, University of Newcastle Australia, Ourimbah, New South Wales, Australia
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