EcosystemsDoNotAlwaysBendTo
BottomLinesVille
Alexandra Morton has been doing a lot of heavy lifting to determine whether or not ocean-based salmon farming is a danger to wild fish stocks.
Here are excerpts from her piece from earlier this week in
the Georgia Straight:...In 2011, Creative Salmon knocked on Dr. Kristi Miller’s door at the DFO Pacific Biological Station in Nanaimo. They needed help figuring out why the Chinook salmon in their farms were turning yellow and dying. Miller is head of the DFO Molecular Genetics Laboratory in Nanaimo.
Miller detected piscine orthoreovirus, or PRV, a new virus discovered only a few months earlier, as the cause of heart and skeletal muscle inflammation—HSMI—a disease spreading unchecked through the salmon farming industry in Norway...
{snip}
...In 2017, we reported that 94 percent of farm salmon in markets are infected and that the virus has spread coastwide. But it is significantly more prevalent in wild salmon caught near salmon farms...Now.
As Ms. Morton's piece points out, there is a raging debate about whether this specific virus poses a significant threat to wild fish. Ms. Morton feels that she and the folks she is working with have the evidence to indicate that this is, indeed, the case. As I am not an expert, I won't weigh in on the matter except to say that the calls for the DFO to engage in more research do not appear unreasonable.
However, the fact that the virus has been passed from farmed fish to wild fish in the waters of British Columbia indicates that other things can be passed between the two groups as well.
Which means, in my opinion, and in the opinion of at least one fish farming company, that there is cause for concern.
And how do we know that at least one farming company is concerned?
Well, they've gone out of their way to make better pens.
David Gordon Koch had that story in the Tofino-Ucluelet Westerly News
a few months ago:Cermaq, a major aquaculture company, is hailing an experimental “closed containment” facility in Norwegian waters as a safer mode of fish farming, saying that it reduces interactions with the marine habitat.
A similar system could be introduced to Canadian waters by next year, according to David Kiemele, managing director for Cermaq Canada...
{snip}
...He said that a barrier surrounding the net “limits potential interactions between our fish and the environment outside,” although he acknowledged that the experimental facility isn’t completely closed.
Seawater is pumped through the system from a depth of about 13 metres, he said.
“When you’re talking about parasites like sea lice and whatnot, very rarely do you find them down that deep in the water column,” Kiemele said...Hmmmm....
'Sea lice and whatnot' are very rare down there according to Mr. Kiemele.
Don't know about you, but that does not give me the greatest of confidence that cross-contamination of, say whatnotish-type viruses will be eliminated.
Regardless, given their obvious concern about trying to stop cross-contamination why has the company not just gone all the way and moved it's pens to tanks on land?
...Asked why the experimental pens are ocean-based – industry critics have called for fish farms to be removed from the sea entirely – Kiemele said that fish farming would require “a large amount of land” that could be used for other activities, including agriculture.
He also said that a land-based facility would consume large amounts of water and energy for pumping.
“From a practical and economical sense, at the moment it just doesn’t stack up,” he said, adding that the company could also continue to use its ocean-based leases this way...Ahhhhh...
The stacking of the math is the problem.
Now we get it.
.