tailieunhanh - Báo cáo khoa học nông nghiệp " Estimation of Nitrogen and Phosphorus in Effluent from the Striped Catfish Farming Sector in the Mekong Delta, Vietnam "

Tóm tắt Trong năm này Cố gắng nghiên cứu được thực hiện để ước tính nitơ và phốt pho môi trường thải ra từ nuôi cá da trơn sọc (Pangasianodon hypophthalmus) khu vực ở đồng bằng sông Cửu Long (8 330a € "10 550N, 300A 104 €" 106 500E), SouthVietnam. Khu vực chiếm 687,000 t sản xuất trong năm 2007 và tấn trong năm 2008, với trên 95% Sản xuất hàng xuất khẩu đến hơn 100 quốc gia. Thương mại và trang trại tạo nguồn cấp dữ liệu được sử dụng trong nuôi cá tra, Hiện tại, hình thức chiếm ưu thế là nhiều. nitơ thải Levels Có. | AMBIO DOI s13280-010-0072-x REPORT Estimation of Nitrogen and Phosphorus in Effluent from the Striped Catfish Farming Sector in the Mekong Delta Vietnam Sena S. De Silva Brett A. Ingram Phuong T. Nguyen Tam M. Bui Geoff J. Gooley Giovanni M. Turchini Received 12 September 2009 Revised 24 April 2010 Accepted 3 May 2010 Abstract In this study an attempt is made to estimate nitrogen and phosphorus discharged to the environment from the striped catfish Pangasỉanodon hypophthalmus farming sector in the Mekong Delta 8O33 -10O55 N 104O300-106O50 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 kg t fish and farm-made feeds median kg t fish whilst phosphorus discharge levels for commercial feeds median kg t fish were considerably lower than for farm-made feeds median 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. Keywords Effluent discharge Mekong Delta Nitrogen Nutrient mass balance Pangasius Phosphorus Striped catfish Tra Catfish BMPs INTRODUCTION Aquaculture or farming of aquatic organisms is a very old tradition .