From: "Lawrence F. London, Jr." <lflj@bellsouth.net>
To: permaculture <permaculture@lists.ibiblio.org>
Subject: [permaculture] Fwd: Recirculating Water Systems Used for Fish Production
Date: Mon, 22 Nov 2010 12:24:33 -0500
-------- Original Message --------
Subject: Recirculating Water Systems Used for Fish Production
Date: Wed, 20 Oct 2010 07:37:49 -0400
From: ARS News Service <NewsService@ars.usda.gov>
Reply-To: ARS News Service <NewsService@ars.usda.gov>
To: ARS News subscriber <lflj@bellsouth.net>
ARS News Service
Agricultural Research Service, USDA
--View this report online, plus photos and related stories, at
www.ars.usda.gov/is/pr
--Follow us on Twitter at http://twitter.com/ARSInformation
Photo: Two researchers examine a tank of trout. Link to photo information
<http://www.ars.usda.gov/is/graphics/photos/oct10/d1957-1.htm>
ARS geneticist Tim Leeds (left) and ARS research leader Caird Rexroad III
have developed a way to raise trout in a
recirculated-water system. /Click the image for more information about it./
------------------------------------------------------------------------------------------------------------------------
See our information kit <http://www.ars.usda.gov/is/br/aqua/index.htm>to find
out more.
------------------------------------------------------------------------------------------------------------------------
Recirculating Water Systems Used for Fish Production
By Sharon Durham </is/contacts.htm#Sharon>
October 20, 2010
U.S. Department of Agriculture <http://www.usda.gov/wps/portal/usda/usdahome>
(USDA) scientists in West Virginia and
Maine are working closely with a collaborator to save water as part of an
effort to develop recirculating water systems
for cool- and cold-water fish production.
ARS is USDA's principal intramural scientific research agency. This research
supports the USDA priority of promoting
international food security.
The recirculating system Summerfelt developed doesn't just move water around.
It uses as little as 4 percent new water
each day, which means that a complete water exchange only takes place every
25 days. According to Summerfelt, this
miserly use of water—an environmental plus—also allows recirculating fish
farm systems to be located in many places
where traditional aquaculture wouldn't work.
William Wolters
<http://www.ars.usda.gov/pandp/people/people.htm?personid=34626>, director of
NCWMAC, found that the
systems developed for his facility's particular needs are working well.
Because Franklin has limited groundwater
resources, a system that reuses water was crucial. The recirculating systems
have allowed the researchers to raise their
fish efficiently with a limited amount of water.
In Leetown, W.V., scientists led by Caird Rexroad III
<http://www.ars.usda.gov/pandp/people/people.htm?personid=38205>
at the NCCCWA are working with trout, a fish that needs especially pristine
water in order to live and thrive. Twenty
years ago, it was believed that trout couldn't thrive in a water
recirculating system. Particularly sensitive to water
quality, they will not eat enough feed to grow if conditions aren't right.
The recirculating systems developed for the cool and cold aquaculture fish
have several advantages over current systems,
according to Summerfelt. Because they require far less water and capture the
wastes, a fish farm that recirculates its
water can be located far from large water bodies and near consumers. This
gets fresh fish to market faster and with less
transportation costs.
USDA is an equal opportunity provider, employer and lender. To file a
complaint of discrimination, write: USDA,
Director, Office of Civil Rights, 1400 Independence Ave., S.W., Washington,
D.C. 20250-9410 or call (800) 795-3272
(voice), or (202) 720-6382 (TDD).
This is one of the news reports that ARS Information distributes to
subscribers on weekdays.
Send feedback and questions to the ARS News Service at
NewsService@ars.usda.gov.
* You are subscribed to "ARS News" as lflj@bellsouth.net.
* To change the address, please notify the ARS News Service at
NewsService@ars.usda.gov.
* To unsubscribe, send a blank email to
leave-172658-2628.8e065119c74efe3a47aec8796964cf8b@ls.ars.usda.gov.
* Other ARS news products are available by e-mail. For details about them or
to subscribe, please contact the ARS News
Service or visit http://www.ars.usda.gov/is/pr/lists.htm.