Estimation of Nitrogen and Phosphorus in Effluent from the Striped Catfish Farming Sector in the Mekong Delta,Vietnam |
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Authors: | Sena S De Silva Brett A Ingram Phuong T Nguyen Tam M Bui Geoff J Gooley Giovanni M Turchini |
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Institution: | (1) Network of Aquaculture Centres in Asia-Pacific (NACA), PO Box 1040, Kasetsart Post Office, Bangkok, 10903, Thailand;(2) School of Life and Environmental Sciences, Deakin University, Warrnambool, VIC, Australia;(3) Department of Primary Industries, Fisheries Victoria, Melbourne, VIC, Australia;(4) College of Aquaculture and Fisheries, Can Tho University, Can Tho, Vietnam |
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Abstract: | In this study an attempt is made to estimate nitrogen and phosphorus discharged to the environment from the striped catfish
(Pangasianodon hypophthalmus) farming sector in the Mekong Delta (8°33′–10°55′N, 104°30′–106°50′E), South Vietnam. The sector accounted for 687,000 t
production in 2007 and 1,094,879 t in 2008, with over 95% of the produce destined for export to over 100 countries. Commercial
and farm-made feeds are used in catfish farming, currently the former being more predominant. Nitrogen discharge levels were
similar for commercial feeds (median 46.0 kg/t fish) and farm-made feeds (median 46.8 kg/t fish); whilst, phosphorus discharge
levels for commercial feeds (median 14.4 kg/t fish) were considerably lower than for farm-made feeds (median 18.4 kg/t fish).
Based on the median nutrient discharge levels for commercial feeds, striped catfish production in the Mekong Delta discharged
31,602 t N and 9,893 t P, and 50,364 t N and 15,766 t P in 2007 and 2008, respectively. However, the amount of nutrients returned
directly to the Mekong River may be substantially less than this as a significant proportion of the water used for catfish
farming as well as the sludge is diverted to other agricultural farming systems. Striped catfish farming in the Mekong Delta
compared favourably with other cultured species, irrespective of the type of feed used, when the total amounts of N and P
discharged in the production of a tonne of production was estimated. |
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Keywords: | Effluent discharge Mekong Delta Nitrogen Nutrient mass balance Pangasius Phosphorus Striped catfish Tra Catfish BMPs |
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