Document Detail

Closing a loop: substance flow analysis of nitrogen and phosphorus in the rainbow trout production and domestic consumption system in Finland.
MedLine Citation:
PMID:  20653275     Owner:  NLM     Status:  MEDLINE    
Ongoing eutrophication is changing the Baltic Sea ecosystem. Aquaculture causes relatively small-scale nutrient emissions, but local environmental impact may be considerable. We used substance flow analysis (SFA) to identify and quantify the most significant flows and stocks of nitrogen (N) and phosphorus (P) related to rainbow trout aquaculture in Finland. In 2004-2007, the input of nutrients to the system in the form of fish feed was 829 t N year(-1) and 115 t P year(-1). Around one-fifth of these nutrients ended up as food for human consumption. Of the primary input, 70% ended up in the Baltic Sea, directly from aquaculture and indirectly through waste management. The nutrient cycle could be closed partially by using local fish instead of imported fish in rainbow trout feed, thus reducing the net load of N and P to a fraction.
Eero Asmala; Laura Saikku
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ambio     Volume:  39     ISSN:  0044-7447     ISO Abbreviation:  Ambio     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-07-26     Completed Date:  2010-08-17     Revised Date:  2012-09-24    
Medline Journal Info:
Nlm Unique ID:  0364220     Medline TA:  Ambio     Country:  Sweden    
Other Details:
Languages:  eng     Pagination:  126-35     Citation Subset:  IM    
Environmental Sciences, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.
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MeSH Terms
Food Supply
Models, Biological
Nitrogen / chemistry*
Oncorhynchus mykiss / physiology*
Phosphorus / chemistry*
Time Factors
Water Pollutants, Chemical / chemistry
Reg. No./Substance:
0/Water Pollutants, Chemical; 7723-14-0/Phosphorus; 7727-37-9/Nitrogen

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