Aquaculture - Current Topics
![Header Image: Atlantic Salmon in BC](/web/20061101032508im_/http://www.pac.dfo-mpo.gc.ca/aquaculture/topics/images/topichdr_2.gif)
Why grow
Atlantic Salmon in BC?
When salmon farming began in BC during the
late 1970s, three species of Pacific salmon were raised:
chinook, coho and sockeye. Farmers encountered a number of
problems raising sockeye and coho salmon, including a low
survival rate upon entry to saltwater, stress leading to
mortality or poor product quality, and slow and unpredictable
growth. By this time, Atlantic salmon were already being
farmed in Washington State. BC salmon farmers began raising
Atlantic salmon in the mid-1980s.
Atlantics were selected for fish farming for a
number of reasons:
· they often have better growth and survival
rates than Pacific salmon;
· they are a more docile stock than Pacific
species;
· there is a strong international market
demand for Atlantic salmon; and,
· processors find that Atlantic salmon provide
more meat and create less
waste per fish.
High quality chinook and coho are also raised
in BC. Atlantic salmon account for approximately 65% of BC
production.
Atlantic Salmon Escape
While regulations and tougher compliance
measures for salmon farm operators were put in place last year
to proactively prevent escapes from occurring, they do not
preclude Atlantic salmon escapes from taking place. Escapes
sometimes occur because predators such as seals or sea lions
cause damage to nets by trying to climb over or chew through
the layers of protective barriers. Escapes can also occur
during transport or transfer accidents.
The Auditor General commented on the issue of
escapes in his report to Parliament earlier this year.
Fisheries and Oceans Canada takes these comments seriously and
is working closely with the Province of BC and the industry to
keep Atlantic salmon escapes as close to zero as possible. In
fact, less than 0.3% of all farmed salmon escaped from net
pens in BC in 2000. This is a five-year continuous and sharp
decline in escape rates. Monitoring for escaped Atlantic
salmon began in 1991.
Do Atlantic salmon compete for habitat over
wild stocks?
One of the arguments made by fish farming
opponents is escaped Atlantic salmon can result in established
Atlantic salmon populations, competing with Pacific salmon for
habitat. This is simply not true. Washington State was
actively stocking Atlantic salmon in their waters until 1990
with no success. There have been attempts to stock Atlantic
salmon around the world and to date no anadromous or sea run
populations have been established.
Early this century, Atlantic salmon were
introduced to many British Columbia watersheds in a deliberate
attempt to establish runs for sport fishing. All attempts to
establish runs of Atlantic salmon on the BC coast have failed.
Nearly 200 introductions were made into 52 different water
bodies all over the coast of BC. A total of 13.9 million eggs,
alevins, fry or smolts were introduced. Not a single
introduction was successful, and only three adult Atlantic
salmon were ever recovered from these efforts. Similar results
have occurred with Atlantic salmon introductions in Australia,
New Zealand, South Africa, Washington State and many other
countries. There has never been a successful introduction of
sea run Atlantic salmon outside of their natural territory
where other native salmon species were present. There are many
environmental factors that influence the abundance of fish
stocks: ocean condition and marine survival; naturally
occurring parasites in both salt and fresh water; fresh-water
habitat; water levels and water temperatures. Since strict
conservation measures were put in place in 1997, there have
been steady improvements in many runs. Certainly, there remain
stocks of concern for which the Department continues to impose
protective measures and implement recoveryplans.
Do escaped Atlantic salmon pose a threat to
Pacific salmon?
The Department has conducted research on the
interactions between farmed and wild salmon. Departmental
scientists have studied interaction at net pens as well as the
stomach contents of escaped Atlantic salmon. Both bodies of
research suggest a very low level of interaction (both through
competition or predation). There is no evidence that escaped
Atlantic salmon pose a threat to Pacific salmon. Experience in
BC and from around the world combined suggests a low risk that
Atlantic salmon could establish themselves in local waters and
compete for food or habitat with local, more aggressive wild
salmon. If farm fish escape, their survival rate appears to be
low. They have been hand fed from birth and, like all
domesticated animals, are poorly suited to survival in the
wild. Escaped Atlantic salmon are docile and they are usually
found showing signs of starvation. Farmed salmon are hand fed
a diet composed exclusively of locally manufactured fish meal
pellets. Stomach content analysis of recovered Atlantic salmon
indicates that the intake of wild food by farmed salmon is
low. Of the small amounts consumed, most consisted of trace
amounts of herring.
Do farmed salmon compete for food with wild
salmon?
Farmed salmon are hand fed a diet composed
exclusively of locally manufactured fish meal pellets. A study
conducted by the BC Ministry of Agriculture, Fisheries and
Food indicates that the intake of wild food by farmed salmon
is low. Of the small amounts consumed, most consisted of
invertebrates that live on the farm net. No juvenile wild
salmon were consumed by any of the farmed fish examined.
Can Atlantic salmon genetically pollute local
salmon stock?
Atlantic salmon (genus: Salmo) are genetically
a different genus and species from Pacific salmon (genus:
Oncorhynchus). This genetic difference is responsible for the
two species being unable to behaviourally queue up during the
mating ritual. As such, the production of viable offspring
through interbreeding between Pacific and Atlantic salmon
appears impossible. Even under controlled laboratory
conditions, very few hybrid offspring survive and these are
sterile.
What is being done to identify and remove
Atlantic salmon from BC rivers?
The numbers of Atlantic salmon observed in BC
rivers in 2000 was 131 adults. This was a year where the
largest effort ever mounted to find and remove Atlantic
salmon. The effort was funded by DFO, BC Ministry of
Agriculture, Fish and Food, BC Ministry of Water, Land and Air
Protection (formerly Ministry of Environment, Lands and Parks)
and Stolt Sea Farms. In addition to the hundreds of rivers
monitored by DFO and provincial agencies for regular stock
assessment, 38 rivers were surveyed specifically for Atlantic
salmon.
The joint federal / provincial Atlantic Salmon
Watch Program has been monitoring the presence of Atlantic
salmon in BC stream for ten years. The Department also
monitors for Atlantic salmon through our on-going stock
assessment activities for Pacific salmon.
What is the Atlantic Salmon Watch Program?
The Atlantic Salmon Watch Program (ASWP) is a
cooperative research program operated by Fisheries and Oceans
Canada with funding from the BC Fisheries. The purpose of the
program is to study the abundance, distribution and biology of
Atlantic salmon in British Columbia and its adjacent waters.
The ASWP monitors commercial and sport catches and
observations of Atlantic salmon throughout British Columbia,
Alaska and Washington in co-operation with the BC Ministry of
Agriculture, Food and Fisheries, the Alaska Department of Fish
and Game and the Washington Department of Fish and Wildlife.
The program relies on fishers, fish
processors, government field staff and hatchery workers to
report observations of Atlantic salmon. For more information
about the Atlantic Salmon Watch Program, please visit this
website:
http://www.pac.dfo-mpo.gc.ca/sci/aqua/ASWP_e.htm
In 2001, Fisheries and Oceans Canada has again
partnered with the provincial agencies and the BC Salmon
Farmers Association to conduct the First Nations Atlantic
Salmon Watch (investment of $220,000 for training, salaries
and equipment from the Provincial Interim Measures Fund).
Sixty members of coastal first nations will be trained and
deployed to survey the streams for Atlantic salmon in their
traditional territories. Last year, the industry also invested
$85,000 in surveys and we are continuing to receive good
cooperation and support from industry in that regard.
Aren’t there significant risks in farming a
non-native fish species in BC?
Managed risk does not imply zero risk. Humans
rely on a number of products in their everyday life such as
automobiles, air planes, lumber, and oil. Not one of the
products are a result of an environmentally risk-free
industry, yet we have come to accept these industries as part
of the natural course of our lives either out of necessity,
convenience or pleasure.
The BC government, in cooperation with
Fisheries and Oceans Canada, conducted an extensive
environmental assessment review of the salmon farming industry
in 1997, commonly known in BC as the Salmon Aquaculture Review
or SAR. Based on the best available scientific evidence, the
SAR team concluded that salmon farming posed a low overall
risk to the environment. This review included an assessment of
escaped farmed fish and the scientific review panel concluded
that there was no compelling reason to stop farming Atlantic
salmon in BC.
There is no scientific evidence to support
that mature Atlantic salmon could disrupt the life history
processes or cause disease transfer to wild Pacific salmon.
These claims also contradict the conclusions of SAR and a
similar review in Washington State in 2000. The Province has
also been proactive in ensuring industry have escape
prevention plans in place by January 1, 2001 and industry
themselves have developed a code of practice to address many
of the environmental concerns that have been raised.
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