Salmon-Killing Virus Seen for First Time in the Wild on the Pacific Coast
A lethal and highly contagious marine virus has been detected for the first time in wild salmon in the Pacific Northwest, researchers in British Columbia said on Monday, stirring concern that it could spread there, as it has in Chile, Scotland and elsewhere.
A farm-raised salmon, the type hit hardest by infectious salmon anemia. The spread to the wild in the Pacific Northwest was reported by researchers in British Columbia.
Farms hit by the virus, infectious salmon anemia, have lost 70 percent or more of their fish in recent decades. But until now, the virus, which does not affect humans, had never been confirmed on the West Coast of North America.
The researchers, from Simon Fraser University and elsewhere, said at a news conference in Vancouver that the virus had been found in 2 of 48 juvenile fish collected as part of a study of sockeye salmon in Rivers Inlet, on the central coast of British Columbia. The study was undertaken after scientists observed a decline in the number of young sockeye.
Richard Routledge, an environmental scientist at the university who leads the sockeye study, suggested that the virus had spread from the province’s aquaculture industry, which has imported millions of Atlantic salmon eggs over the last 25 years, primarily from Iceland and Scandinavia. He acknowledged that no direct evidence of that link existed, but noted that the two fish had tested positive for the European strain of infectious salmon anemia.
The virus could have “a devastating impact” not just on the region’s farmed and wild salmon but on the many species that depend on them in the food web, like grizzly bears, killer whales and wolves, Dr. Routledge said. “No country has ever gotten rid of it once it arrives,” he said in a statement.
Posted on New York Times By: Cornelia Dean
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