Like your pro-feedlot buddy, you are trying to refocus the blame on the wild fish.
While wild fish are carriers they do not live in the close confines of a feedlot so the IHN virus is not as easily transferred between wild fish as it is in the feedlot fish. Take the example of a kid with a cold...... sneezing and infecting some of his class mates. Imagine a class room packed with kids who all have a cold..... and are sneezing...... The chances of a passerby being infected, go up substantially.
The recently announced infected feedlots, have been spewing 100's of millions of the IHN viruses, infecting every wild fish swimming by. Even after the infected feedlot is "isolated", the viruses it has been spewing, continue to live and infect wild salmon for up to 3 weeks in the salt water. This in the midst of 100's of 1,000's of migrating salmon.
Not a problem for the wild fish as absolon suggests..... however once these infected wild salmon reach a fresh water lake and mingle with the sockeye smolts still living there, they become killing machines. Add to that the fact the virus lives for up to 7 weeks in fresh water, they can potentially kill an entire years worth of sockeye.
Is this really the fault of the wild fish?
Claims about salmon viruses simply incorrect
August 24, 2012
Claims about salmon viruses simply incorrect
Gary Marty, Nanaimo Daily News, August 24, 2012
Re: ‘Government testing of salmon a flawed process’ ( Your Letters, Aug. 21)
As the fish pathologist for the B.C. Ministry of Agriculture, I am disappointed to see Alexandra Morton continue to mislead readers with inaccurate statements about salmon diseases in British Columbia.
She says that the farmed Atlantic salmon virus “infectious salmon anemia virus (ISAV) is one of these farm animal influenzas and it has spread everywhere large numbers of Atlantic salmon are raised in ocean pens.” This statement has two errors.
First, ISAV is not an influenza virus; instead, it is an isavirus. And second, B.C. has millions of Atlantic salmon raised in ocean pens but no confirmed evidence of ISAV. This conclusion is supported by thousands of tests, including all results reported by Alexandra Morton.
Morton said that “I found (ISAV) in B.C.”
This is not correct. It has now been 10 months since Morton first reported positive PCR test results for ISAV in fish that had no evidence of the disease ISA, but her test results have not confirmed either the ISA virus or the ISA disease.
Unconfirmed PCR test results that are not related to disease are usually false positives. False positive test results are not a threat to either wild or farm salmon.
Morton also said that “during the (Cohen) inquiry we learned DFO found 100% of the Cultus Lake sockeye . . . had tested positive for this virus.”
This is not correct. Researcher Molly Kibenge sequenced her PCR product and reported that “The sockeye clones do not resemble any ISAV isolate” and, they “show homology to short sequences of human, mouse, rat and zebrafish clones” (Cohen Commission Exhibit 2140).
These results are called “nonspecific amplification.” It means that the test did not work properly and needs to be redone. Tests that do not work properly are not a threat to wild or farm salmon.
Finally, Morton says that “CFIA will not be testing the millions of farm salmon being raised among the wild salmon” and, “The status of these viruses in salmon farms will be left to the industry to report.” The first statement is misleading; the second is not correct.
DFO’s website “Fish Health Management in the Pacific Region” clearly describes their extensive fish health program that tests for ISAV in fish that die on the farms. CFIA sees these results, and the B.C. Ministry of Agriculture runs these tests for DFO. So far this year, ISAV test results on all 341 farm salmon analysed as part of this program have been negative — no virus.
For early detection of disease, I estimate that testing fish that die on the farms is 400 times more sensitive than random testing of live fish or harvested fish. This means that this year, DFO has tested the equivalent of 136,400 of the supermarket fish tested by Morton.
Alexandra Morton is a great story teller, but much of what she says is just that: a story.
For the best information about salmon diseases and their control, I depend on CFIA, DFO, and the fish farm veterinarians.
Gary Marty B.C. Ministry of Agriculture
.
.