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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Environmental impact of capture-based bluefin tuna aquaculture on benthic communities in the western Mediterranean  [2007]

Vita, Rubén; Marin, Arnaldo;

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Tuna farming is based on fishing bluefin tuna in their natural habit of the western Mediterranean and fattening them in floating cages. Although this type of aquaculture is expanding rapidly in the Mediterranean Sea, very little information is available for an environmental impact assessment and environmental monitoring of tuna ranching. Spatial and temporal scales of impact need to be established before the norms and regulations affecting this new branch of aquaculture can be properly implemented. The biotic indices measured pointed to detectable impact only under the cages, although multivariate techniques defined an environmental gradient of stressed macrofaunal assemblages. The benthic surveys carried out indicated that high impact was restricted to a radius of roughly 5 m from the cages with a transitional radius at 35 m. This zone was characterized by high densities of opportunistic species. There was a further zone of moderately stressed benthic environment extending to about 180-220 m from the cages. This moderately stressed zone exhibited slight changes in community structure, because the densities of some species were stimulated. At distances greater than 220 m from the tuna farm, the system apparently returned to normal conditions. The fallow period produced partial remediation of the area affected, except in the sediment underneath the cages where even a 6-month fallow period was not sufficient for the community to totally recover.
From the journal
Aquaculture research
ISSN : 1355-557X

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
38
Issue:
4
Start Page:
331
End Page:
339
Publisher:
Oxford, UK : Blackwell Publishing Ltd
All titles:
"Environmental impact of capture-based bluefin tuna aquaculture on benthic communities in the western Mediterranean"@eng
Other:
"Includes references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
38
Issue:
4
Start Page:
331
End Page:
339
Publisher:
Oxford, UK : Blackwell Publishing Ltd
All titles:
"Environmental impact of capture-based bluefin tuna aquaculture on benthic communities in the western Mediterranean"@eng
Other:
"Includes references"