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Water quality and plankton densities in mixed shrimp-mangrove forestry farming systems in Vietnam

2002; Wiley; Volume: 33; Issue: 10 Linguagem: Inglês

10.1046/j.1365-2109.2002.00722.x

1365-2109

David Johnston, Martin Lourey, Doan Van Tien, T T Luu, Tingxia Xuan,

Aquatic Ecosystems and Biodiversity

Aquaculture ResearchVolume 33, Issue 10 p. 785-798 Water quality and plankton densities in mixed shrimp-mangrove forestry farming systems in Vietnam D Johnston, D Johnston School of Aquaculture, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Launceston, Tasmania 7250, AustraliaSearch for more papers by this authorM Lourey, M Lourey IASOS, University of Tasmania, Hobart, Tasmania 7001, AustraliaSearch for more papers by this authorD Van Tien, D Van Tien Research Institute for Aquaculture no. 2, Ho Chi Minh City, VietnamSearch for more papers by this authorT T Luu, T T Luu Research Institute for Aquaculture no. 2, Ho Chi Minh City, VietnamSearch for more papers by this authorT T Xuan, T T Xuan Research Institute for Aquaculture no. 2, Ho Chi Minh City, VietnamSearch for more papers by this author D Johnston, D Johnston School of Aquaculture, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Launceston, Tasmania 7250, AustraliaSearch for more papers by this authorM Lourey, M Lourey IASOS, University of Tasmania, Hobart, Tasmania 7001, AustraliaSearch for more papers by this authorD Van Tien, D Van Tien Research Institute for Aquaculture no. 2, Ho Chi Minh City, VietnamSearch for more papers by this authorT T Luu, T T Luu Research Institute for Aquaculture no. 2, Ho Chi Minh City, VietnamSearch for more papers by this authorT T Xuan, T T Xuan Research Institute for Aquaculture no. 2, Ho Chi Minh City, VietnamSearch for more papers by this author First published: 31 July 2002 https://doi.org/10.1046/j.1365-2109.2002.00722.xCitations: 23 Danielle Johnston, School of Aquaculture, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Locked Bag 1–370, Launceston, Tasmania 7250, Australia. E-mail: [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 Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Water quality and plankton densities were monitored in shrimp ponds at 12 mixed shrimp-mangrove forestry farms in Ca Mau province, southern Vietnam, to detail basic water chemistry and assess whether conditions are suitable for shrimp culture. In general, water quality was not optimal for shrimp culture. In particular, ponds were shallow (mean ± 1SE, 50.5 ± 2.8 cm), acidic (pH < 6.5), had high suspended solids (0.3 ± 0.03 g l−1), low chlorophyll a/phytoplankton concentrations (0.2 ± 0.05 µg l−1 and 8600 ± 800 cells l−1 respectively) and low dissolved oxygen (DO) levels (3.7 ± 0.15 mg l−1). Eight out of the 12 farms sampled had potentially acid sulphate soils (pH < 4.2). Salinity, DO and pH were highly variable over short time-periods (hours); DO in particular was reduced to potentially lethal levels (1–2 mg l−1). Seasonal variations in water chemistry and plankton communities (i.e. salinity, DO, phosphate, temperature, phytoplankton and zooplankton densities) appear to be driven by differences in rainfall patterns. The presence or absence of mangroves on internal pond levees (‘mixed’ versus ‘separate’ farms) and the source of pond water (rivers versus canals) were of lesser importance in determining water quality patterns and plankton biomass. Zooplankton and macrobenthos densities were sufficient to support the current (low) stocking densities of shrimp. However, natural food sources are not adequate to support increases in production by stocking hatchery reared post larvae. Increasing productivity by fertilization and/or supplemental feeding has the potential for adverse water quality and would require improvements to water management practices. Some practical strategies for improving water quality and plankton densities are outlined. Citing Literature Volume33, Issue10August 2002Pages 785-798 RelatedInformation