I'd posted an article some months ago about Arctic
aboriginal children and the toxic neurological effects
from consuming some of their traditional foods, such
as mukluk (whale, seal and walrus blubber), which has
become quite contaminated with dioxins and PCBs [IIRC,
eating more than one cubic _centimeter_ of mukluk per
week was rated harmful to growing children].  Now it
seems that farmed salmon is joining the toxic food
list:

"...The Science study analyzed two metric tons of wild
and farmed salmon sold in North America, South America
and Europe. Using Environmental Protection Agency
health guidelines, the study concluded that consumers
can safely eat four to eight meals of wild salmon a
month, while consumption of more than one eight-ounce
portion of farmed salmon a month in most cases poses
an "unacceptable cancer risk." The study found that
European farmed salmon had significantly greater
contaminant loads than those farmed in North and South
America. The Science study can be found at:
http://www.pewtrusts.com/pdf/salmon_study.pdf

"The clear message for consumers from the study is
that wild salmon is much safer and healthier than
farmed salmon," says Kathleen Schuler, Environmental
Health Scientist with IATP. "FDA's existing fish
consumption advice for women of child-bearing age and
children doesn't distinguish farmed and wild fish; it
also considers risks only from mercury contamination,
and not risks from other known toxins like PCBs and
dioxins." 

You can link to the secondary article above at
http://www.bushgreenwatch.org/journalists_only.php
--it's the Jan 14 article.
 
This is the PubMed abstract of the Science article:
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14716013&dopt=Abstract

Here is another study concluding that "The human
health implications of eating farmed salmon are
considered from the perspective of the current WHO and
Health Canada (2000) tolerable daily intake (TDI)
values for PCBs. Based on a TDI of 1 pg TEQ/kg bw/day,
this analysis indicated a safety concern for
individuals who on a regular weekly basis consume
farmed salmon produced from contaminated feed."
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11999769&dopt=Abstract

And another study "confirms previous reports of
relatively high concentrations of PCDDs, PCDFs and,
especially, PCBs in farmed Scottish salmon. The
results indicate that high consumption of salmon,
particularly by children under 5 years, could lead to
intakes above the tolerable daily intake (TDI) and
tolerable weekly intake (TWI) for these chemicals,
especially the PCBs.."
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11993634&dopt=Abstract

A preliminary study further suggests that escaped
farmed salmon may have an adverse impact on wild
salmon populations:
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14667333&dopt=Abstract
"The high level of escapes from Atlantic salmon farms,
up to two million fishes per year in the North
Atlantic, has raised concern about the potential
impact on wild populations...We thus demonstrate that
interaction of farm with wild salmon results in
lowered fitness, with repeated escapes causing
cumulative fitness depression and potentially an
extinction vortex in vulnerable populations."

Debbi

"If we are saying that the loss of species in and of
itself is inherently bad -- I don't think we know
enough about how the world works to say that." 
-Interior Department Assistant Secretary Craig Manson,
appointed by President Bush to position overseeing the
Endangered Species Act, Los Angeles Times, Nov. 12, 2003

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