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Biological characteristics of the improved extensive shrimp system in the Mekong delta of Vietnam

2011; Wiley; Volume: 43; Issue: 4 Linguagem: Inglês

10.1111/j.1365-2109.2011.02858.x

1365-2109

Nguyen Tho, Roel Merckx, Vũ Ngọc Út,

Aquatic Ecosystems and Biodiversity

Aquaculture ResearchVolume 43, Issue 4 p. 526-537 Biological characteristics of the improved extensive shrimp system in the Mekong delta of Vietnam Nguyen Tho, Nguyen Tho Vietnamese Academy of Science and Technology, Ho Chi Minh City Institute of Resources Geography, Ho Chi Minh City, VietnamSearch for more papers by this authorRoel Merckx, Roel Merckx Faculty of Bioscience Engineering, Department of Earth and Environmental Sciences, Division Soil and Water Management, Katholieke Universiteit Leuven, Heverlee, BelgiumSearch for more papers by this authorVu Ngoc Ut, Vu Ngoc Ut Department of Applied Hydrobiology, College of Aquaculture and Fisheries, Can Tho University, Can Tho City, VietnamSearch for more papers by this author Nguyen Tho, Nguyen Tho Vietnamese Academy of Science and Technology, Ho Chi Minh City Institute of Resources Geography, Ho Chi Minh City, VietnamSearch for more papers by this authorRoel Merckx, Roel Merckx Faculty of Bioscience Engineering, Department of Earth and Environmental Sciences, Division Soil and Water Management, Katholieke Universiteit Leuven, Heverlee, BelgiumSearch for more papers by this authorVu Ngoc Ut, Vu Ngoc Ut Department of Applied Hydrobiology, College of Aquaculture and Fisheries, Can Tho University, Can Tho City, VietnamSearch for more papers by this author First published: 21 April 2011 https://doi.org/10.1111/j.1365-2109.2011.02858.xCitations: 12 N Tho, Vietnamese Academy of Science and Technology, Ho Chi Minh City Institute of Resources Geography, 01 Mac Dinh Chi Str., Dist. 1, Ho Chi Minh City, Vietnam. E-mail: [email protected], [email protected] Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Low and unstable shrimp yields of the improved extensive shrimp system has been a tremendous obstacle for economic development in the coastal areas of Southern Vietnam. To investigate the biological characteristics of this system, ponds in the coastal Cai Nuoc district, Mekong delta of Vietnam, were monitored. Results showed that the system was not optimal for shrimp. While chlorophyll a (chl a) (1.51–37.2 μg L−1), phytoplankton density (6333–974 444 cells L−1) and zooplankton density (7.1–517.2 ind L−1) were abundant and comparable to shrimp farms elsewhere, zoobenthic community was very poor (7–1971 ind m−2). Toxin-producing cyanobacteria (Oscillatoria limosa, Oscillatoria formosa, Anabaena sp. and Phormidium tenue) were found. Total bacteria and Vibrios were present in large numbers (respectively 1.04 × 105 and 6.64 × 102 CFU mL−1 in pond water, 6.33 × 105 and 9.47 × 103 CFU g−1 in sediment). Presence of toxin-producing organisms, poor zoobenthic community and abundance of Vibrios all can enhance shrimp susceptibility to diseases. The following measures are recommended to improve the situation: (1) complete testing of seeds for pathogens, (2) not to incorporate fish into shrimp ponds and (3) applying no-culture breaks and pathogen-killing chemicals. References ADB/MoFi (1996) Vietnam coastal aquaculture sector review. 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