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International Society for Infectious Diseases <http://www.isid.org>

Date: Thu 19 Jul 2012
Source: Sciencedaily.com [edited]

A Simon Fraser University (SFU) fish-population statistician, working in collaboration with non-government organization (NGO) scientists, has uncovered evidence of a potentially deadly virus in a freshwater sport fish in British Columbia.

SFU professor Rick Routledge and Stan Proboszcz, a fisheries biologist at the Watershed Watch Salmon Society, have found evidence of the piscine reovirus (PRV) in cutthroat trout caught in Cultus Lake.

Tests conducted by, Fred Kibenge, a virology professor at the Atlantic Veterinary College in Prince Edward Island, Canada, found evidence of the virus in 13 of 15 sampled fish. Follow-up analyses further confirmed the virus's presence in these fish and identified their genetic sequencing as 99 per cent identical to Norwegian strains.

The virus has been scientifically linked to heart and skeletal muscle inflammation (HSMI), a disease that has reportedly become widespread in Norwegian salmon farms and can kill up to 20 per cent of infected fish.

Routledge believes this first ever discovery of PRV in a B.C.
freshwater sport fish indicates the virus could be prevalent in B.C.

Many Canadian scientists and interest groups are concerned that B.C.
salmon farms pose a serious risk to wild Pacific salmon. Scientists in other countries have specifically raised concerns about the spread of PRV from farms to wild salmon.

"If PRV has been found in a Cultus Lake sport fish it could be contributing to the failure of the lake's sockeye population to return in abundance," says Routledge.

He notes the federal government-mandated Committee on the Status of Endangered Wildlife in Canada has listed the species as endangered.

"The discovery of PRV in Cultus Lake's cutthroat trout also begs the question is it in other related species in the lake, such as rainbow trout, kokanee and Dolly Varden? This latest discovery could also mean that salmon and trout in any lake exposed to spawning salmon returning from the North Pacific must be considered at risk of infection."

Earlier this year [2012], SFU honorary degree recipient Alexandra Morton, an independent biologist who collaborates on fish research with Routledge, reported that lab tests had found PRV in Atlantic salmon sold in B.C. supermarkets.

PRV is the 2nd virus commonly associated with salmon farming that scientists say they have found in wild Pacific salmon and trout. Last fall [2011], Routledge and Morton reported positive test results for the infectious salmon anemia virus (ISAv) in sockeye salmon smolts.

Scientists testifying at the Cohen Commission Inquiry -- a federally commissioned investigation of the Fraser River's declining sockeye population -- have brought forth highly contested evidence of ISAv in other wild salmon populations, including Cultus Lake sockeye. The inquiry is scheduled to release its findings this fall.

"We discovered during the Cohen inquiry that pathogens are a major concern for B.C.'s salmon," says Craig Orr, executive director of Watershed Watch and an SFU graduate. "Our findings suggest we need to broaden our thinking and concerns for freshwater fish as well."

"There are many examples of devastating impacts of introduced pathogens in human, mammal and marine populations," adds Routledge.
"When small pox was introduced to North America it decimated the aboriginal population, which had not had any previous opportunity to build up a natural immunity to the disease. The potential for this to happen to B.C.'s highly valued Pacific salmon and trout populations must be taken seriously."

Communicated by:
ProMED-mail from HealthMap Alerts

[The 1st cases of heart and skeletal muscle inflammation (HSMI), were registered in 1999 in the Hitra/Freya area of Norway. Since then, there have been an increasing number of outbreaks along the Norwegian coast, and it was also reported in the UK and in Chile (see post 20111013.3068). Later on, the piscine reovirus (PRV) was established as the causative agent.

This is the 1st report of the disease in the Northern Pacific. This is also the 1st report in cutthroat trout (_Oncorhynchus clarkii_). There is no mention of any pathological finding in this report, just the diagnosis of the virus. Usually, no external lesions are recognized.

A map of the affected area can be accessed at <http://healthmap.org/r/2Ym4>. - Mod.PMB]

[see also:
Infectious hematopoietic necrosis, salmon - USA: (WA)
Infectious hematopoietic necrosis - Canada: (BC) 20120518.1137106
Heart and skeletal muscle virus, salmon - Chile 20111013.3068 Infectious salmon anemia - Canada: (BC) Pacific, 1st rep 20111019.3120] .................................................sb/pmb/ejp/dk/ll
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