caa a22 4500 605464243 CHVBK 20210128100257.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10499-014-9816-0 doi (NATIONALLICENCE)springer-10.1007/s10499-014-9816-0 Pond management strategies for small-scale aquaculture in northern Vietnam: fish production and economic performance [Elektronische Daten] [Johannes Pucher, Richard Mayrhofer, Mansour El-Matbouli, Ulfert Focken] The traditional pond aquaculture in northern Vietnam is a plant-based integrated aquaculture system using poor-quality pond inputs (macrophytes, farm by-products, manures). Most applied feeds are palatable solely to the grass carp (Ctenopharyngodon idella), which is the main species in traditional fish polyculture. Secondary species are malnourished as the natural food productivity is diminished by uncontrolled water flow through and high turbidity. Mass mortalities of grass carp lead to high financial losses for the farmers. To improve the fish production, researchers developed a semi-intensive pond management in stagnant water in which common carp was cultured as the main species with supplemental fertilization and pelleted feeds based mainly on locally available resources. In this study, the traditional and semi-intensive pond management was compared in six ponds for fish production, nutrient efficiencies and economic net benefit. The use of higher-quality feed and fertilizer inputs under semi-intensive pond management resulted in higher fish yields of 228±42kg×1,000m−2 compared to 88±44kg×1,000m−2 under traditional management and higher net economic benefit of 3,848,000±1,469,000 VND×1,000m−2 under semi-intensive compared to 846,000±3,753,000 VND×1,000m−2 under traditional management. Under semi-intensive management, 11.5% of applied total nitrogen was transferred into fish biomass while under traditional management, 4.4% of applied total nitrogen converted into fish biomass. Springer International Publishing Switzerland, 2014 Nitrogen budget nationallicence northern Vietnam nationallicence Phosphorus budget nationallicence Semi-intensive aquaculture nationallicence Supplemental feeding nationallicence ADF : Acid detergent fibre nationallicence ALC : Apparent lipid conversion nationallicence CA : Crude ash nationallicence CL : Crude lipid nationallicence CP : Crude protein nationallicence CPI : Consumer price index nationallicence DM : Dry matter nationallicence FM : Fresh matter nationallicence GE : Gross energy nationallicence NDF : Neutral detergent fibre nationallicence PER : Protein efficiency ratio nationallicence PPV : Protein productive value nationallicence SGR : Specific growth rate nationallicence SRS : Self-recruiting species nationallicence TN : Total nitrogen nationallicence TNER : Total nitrogen efficiency ratio nationallicence TNPV : Total nitrogen productive value nationallicence TP : Total phosphorus nationallicence TPER : Total phosphorus efficiency ratio nationallicence TPPV : Total phosphorus productive value nationallicence VAC : Vietnamese acronym combining garden, fishpond and livestock pen nationallicence VND : Vietnamese dong nationallicence Pucher Johannes Life Science Center, University of Hohenheim, Wollgrasweg 43, 70599, Stuttgart, Germany aut Mayrhofer Richard Fish Medicine and Livestock Management, University of Veterinary Medicine, Vienna, Austria aut El-Matbouli Mansour Fish Medicine and Livestock Management, University of Veterinary Medicine, Vienna, Austria aut Focken Ulfert Federal Research Institute for Rural Areas, Forestry and Fisheries, Thünen-Institute of Fisheries Ecology, Ahrensburg, Germany aut Aquaculture International Springer International Publishing 23/1(2015-02-01), 297-314 0967-6120 23:1<297 2015 23 10499 https://doi.org/10.1007/s10499-014-9816-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10499-014-9816-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pucher Johannes Life Science Center, University of Hohenheim, Wollgrasweg 43, 70599, Stuttgart, Germany aut NATIONALLICENCE 700 1- Mayrhofer Richard Fish Medicine and Livestock Management, University of Veterinary Medicine, Vienna, Austria aut NATIONALLICENCE 700 1- El-Matbouli Mansour Fish Medicine and Livestock Management, University of Veterinary Medicine, Vienna, Austria aut NATIONALLICENCE 700 1- Focken Ulfert Federal Research Institute for Rural Areas, Forestry and Fisheries, Thünen-Institute of Fisheries Ecology, Ahrensburg, Germany aut NATIONALLICENCE 773 0- Aquaculture International Springer International Publishing 23/1(2015-02-01), 297-314 0967-6120 23:1<297 2015 23 10499