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Economic and nutrient discharge tradeoffs of excreta-fed aquaculture in the Mekong Delta, Vietnam
Year:
2008
Authors :
Milstein, Ana
;
.
Volume :
124
Co-Authors:
Nhan, D.K., Mekong Delta Development Research Institute, Can Tho University, Can Tho, Viet Nam, Aquaculture and Fisheries Group, Department of Animal Sciences, Wageningen University, P.O. Box 338, Wageningen, 6700 AH, Netherlands
Verdegem, M.C.J., Aquaculture and Fisheries Group, Department of Animal Sciences, Wageningen University, P.O. Box 338, Wageningen, 6700 AH, Netherlands
Binh, N.T., Mekong Delta Development Research Institute, Can Tho University, Can Tho, Viet Nam
Duong, L.T., Mekong Delta Development Research Institute, Can Tho University, Can Tho, Viet Nam
Milstein, A., Fish and Aquaculture Research Station, Dor, M.P. Hof HaCarmel 30820, Israel
Verreth, J.A.J., Aquaculture and Fisheries Group, Department of Animal Sciences, Wageningen University, P.O. Box 338, Wageningen, 6700 AH, Netherlands
Facilitators :
From page:
259
To page:
269
(
Total pages:
11
)
Abstract:
The present study quantifies the effects on production, nutrient discharge and economic return of the use of pig and human excreta in pond farming. On-farm data from various studies were integrated and analyzed applying single and multiple regression methods. Pond-dissolved oxygen concentration, water exchange and nutrient discharge interacted and were strongly affected by input level. Increased input levels coincided with farmers exchanging more water and discharging more chemical oxygen demand (COD), nitrogen (N), phosphorus (P) and total suspended solids (TSS). Fish yield and the accumulation of organic carbon, N and P in pond sediments increased with the excreta input level. Using a regression model, it was predicted that with an excreta input of 5 kg N ha-1 day-1, a fish yield of 8380 kg and an economic return of 52 million VND ha-1 year-1 can be obtained while about 2060 kg COD, 645 kg N, 210 kg P and 39,200 kg TSS ha-1 year-1 will be discharged. At this input level, it was estimated that about 9% of input-N will be recovered in harvested fish while 52% will accumulate in the pond sediment. Hence, fish culture reduces nutrient discharge from excreta by 61% while generating income for resource-poor farmers. However, in the long run such a system will become unsustainable when more farmers take up this farming practice. The challenges are to reduce nutrient discharges from ponds while maintaining high production and profitability and to use the nutrients accumulated pond sediments more efficiently. © 2007 Elsevier B.V. All rights reserved.
Note:
Related Files :
aquaculture1 (domain1)
Chemical oxygen demand
Excreta-fed aquaculture
Farming system
fish culture
nutrient
Southeast Asia
Show More
Related Content
More details
DOI :
10.1016/j.agee.2007.10.005
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
19356
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:28
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Scientific Publication
Economic and nutrient discharge tradeoffs of excreta-fed aquaculture in the Mekong Delta, Vietnam
124
Nhan, D.K., Mekong Delta Development Research Institute, Can Tho University, Can Tho, Viet Nam, Aquaculture and Fisheries Group, Department of Animal Sciences, Wageningen University, P.O. Box 338, Wageningen, 6700 AH, Netherlands
Verdegem, M.C.J., Aquaculture and Fisheries Group, Department of Animal Sciences, Wageningen University, P.O. Box 338, Wageningen, 6700 AH, Netherlands
Binh, N.T., Mekong Delta Development Research Institute, Can Tho University, Can Tho, Viet Nam
Duong, L.T., Mekong Delta Development Research Institute, Can Tho University, Can Tho, Viet Nam
Milstein, A., Fish and Aquaculture Research Station, Dor, M.P. Hof HaCarmel 30820, Israel
Verreth, J.A.J., Aquaculture and Fisheries Group, Department of Animal Sciences, Wageningen University, P.O. Box 338, Wageningen, 6700 AH, Netherlands
Economic and nutrient discharge tradeoffs of excreta-fed aquaculture in the Mekong Delta, Vietnam
The present study quantifies the effects on production, nutrient discharge and economic return of the use of pig and human excreta in pond farming. On-farm data from various studies were integrated and analyzed applying single and multiple regression methods. Pond-dissolved oxygen concentration, water exchange and nutrient discharge interacted and were strongly affected by input level. Increased input levels coincided with farmers exchanging more water and discharging more chemical oxygen demand (COD), nitrogen (N), phosphorus (P) and total suspended solids (TSS). Fish yield and the accumulation of organic carbon, N and P in pond sediments increased with the excreta input level. Using a regression model, it was predicted that with an excreta input of 5 kg N ha-1 day-1, a fish yield of 8380 kg and an economic return of 52 million VND ha-1 year-1 can be obtained while about 2060 kg COD, 645 kg N, 210 kg P and 39,200 kg TSS ha-1 year-1 will be discharged. At this input level, it was estimated that about 9% of input-N will be recovered in harvested fish while 52% will accumulate in the pond sediment. Hence, fish culture reduces nutrient discharge from excreta by 61% while generating income for resource-poor farmers. However, in the long run such a system will become unsustainable when more farmers take up this farming practice. The challenges are to reduce nutrient discharges from ponds while maintaining high production and profitability and to use the nutrients accumulated pond sediments more efficiently. © 2007 Elsevier B.V. All rights reserved.
Scientific Publication
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