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Why you should think twice about eating farmed salmon
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A study released in the journal Environmental Science
& Technology found much higher levels of some chemical flame
retardants in farmed salmon compared to most wild salmon. The
study concluded that, in spite of the heart healthy benefits of
omega-3 fatty acids in all salmon, frequent consumption of farmed
salmon is more likely than wild to boost levels of chemicals that
researchers have found to be increasing rapidly in people's bodies.
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The groundbreaking study, "A Global Assessment of
Organic Contaminants in Farmed vs. Wild Salmon: Geographical Differences
and Health Risks" was released January 2004 in the respected
journal Science. The study, which is being considered the most
thorough analysis of farmed and wild salmon to date, found in
most cases that consuming more than one serving of farmed salmon
per month could pose unacceptable cancer risks, according to United
States Environmental Protection Agency (EPA) standards for determining
safe fish consumption levels. Farmed salmon were found to have
up to 10 times higher levels of PCBs and dioxins than wild salmon.
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Farmed salmon is much higher in saturated fats than wild
salmon. This can contribute to health problems.
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A single serving of salmon, wild or farmed, gives you
the suggested daily requirement of omega 3 fatty acids. These
essential fatty acids are also found in other wild fish like tuna,
sardines or anchovies. Farmed salmon, however, contains more unhealthy
fats. Preliminary research also shows that farmed salmon has higher
levels of PCBs and other contaminants than wild salmon Farmed
salmon are frequently fed antibiotics which contribute to the
growth of drug-resistant bacteria.
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Farmed salmon are often given additives in their food
to colour their flesh pink with chemicals to resemble its wild
counterparts - otherwise, it would remain an unappetizing grayish-brown
color.
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In BC, over 70% of farmed salmon are Atlantic salmon.
Atlantic salmon are considered exotic (non-native, or alien) species
in Pacific waters since they do not naturally occur in the Pacific
Ocean.
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With only a very few exceptions, farmed salmon are raised
in open net cages in the ocean. These nets can tear, allowing
farmed salmon to escape into the wild. Over a million farmed salmon
have been reported by the industry to have escaped into Pacific
waters since 1988; because many escapes over the years have gone
unreported, experts believe the real figure is much higher.
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According to the Department of Fisheries and Oceans,
Atlantic salmon have been found in over 81 BC rivers and streams.
It is worth noting that only a small portion of BC rivers have
been surveyed so far - meaning non-native Atlantic salmon could
be inhabiting many more.
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Atlantic salmon compete with wild salmon for habitat
and have been known to eat wild salmon fry and eggs. Atlantic
salmon have been found spawning, and juveniles surviving in the
wild.
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There are risks even whe native Pacific salmon escape
into the wild. Escaped farmed chinook can interbreed with wild
chinook. Since farmed salmon are cultivated from a limited gene
pool, this interbreeding leads to "genetic dilution",
or a narrowing of the genetic makeup in wild fish - which could
lessen their ability to survive in the wild.
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Open netcage systems can allow for the transfer of disease
and parasites from farms to wild salmon.
Click here to link to Watershed Watch report ( )
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Salmon farmers are granted licenses to kill predators
such as sea lions and seals to stop them eating their fish. In
the spring of 2001 a mass grave containing at least 15 sea lions
killed by a farm operator was discovered in Clayoquot Sound. Since
then, more pits of dead sea lions have been found in the same
area. BC salmon farmers reported having killed at least 5000 seals
and sea lions in the last decade. The real figure could be much
higher as some kills according to fish farm employees go unreported.
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The mass worldwide production of salmon in fish farms
has caused a drop in wild salmon prices. This has hurt thousands
of commercial fishermen and their communities in which they live
and support, drawing into question the true economic value of
this industry.
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It takes three to five kilograms of other fish, such
as herring and anchovy to make the feed necessary to produce one
kilogram of farmed salmon resulting a loss of edible animal protein
worldwide.
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In Canada it is illegal to make animal feed out of proteins
otherwise suitable for human consumption As a result most of the
feed for BC salmon is obtained from South America. This reduces
the amount of food energy available to people there.
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To fatten up their livestock, some salmon farmers use
bright lights even at night to confuse the salmon into thinking
it is always feeding time. This attracts other fish to the farm
area and may disrupt their feeding and migration patterns.
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In B.C. fish farms use net guards that deter predators.
Some farmers coat the nets in a highly toxic solution to prevent
naturally occurring marine organisms from growing on them. This
toxic solution contaminates our waters.
- There are presently over 85 open net cage fish farms
currently operating in the coastal waters of British Columbia producing
waste that is equivalent in volume to the raw sewage released from a city of 500,000
inhabitants. It could get a lot worse if industry is allowed to add new
farms.
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