Deadly whirling disease in fish has spread from Banff to Bow River

A deadly fish disease discovered for the first time in Canada in late Augusthas now spread to the Bow River, Canadian Food Inspection Agencyofficials confirmed Monday.

Whirling diseaseaffects trout and salmon, and can cause infected fish toswim in a whirling pattern and die prematurely.

• Whirling disease in fish found in Banff lake a 1st in Canada, officials say
• Biologists test Bow River fish for whirling disease

After the disease was first detected in Johnson Lakein Banff National Park, officials began testing nearby waterways to see if it had spread.

They confirmed thepresence ofwhirlingdiseasein the upper Bow River, downstream from the confluence of the Bow River and Cascade River within Banff National Park.

Sample results from the Sam Livingstone Provincial Fish Hatchery in Calgary and the Cold Lake Provincial Hatcheriestested negative.

Work is underway to collect samples from basins immediately adjacent to the Bow River, including theOldman River and upper Red Deer River watersheds.

Results will be reported by theCFIA as they are received.

Bow River attracts fishers from all over the world

The owner of Calgary-based Out Fly Fishing Outfitters says people come from all over the world to fish for trout on the Bow.

"People come here because they want that hard-fighting, exceptional wild fish," Josh Nugent explained.

"If whirling disease were to take hold on the river, it gives people less reason to come here."

'Serious impact'

Alberta Environment and Parks biologist Roger Ramcharitasays it's a serious problem.

"It's possiblein fact, it's highly likelythat of course it's spread within the Bow system into the province of Alberta outside the park."Ramcharitasaid.

At its worst, whirling disease can wipe out up to 90 per cent of a trout population, he said.

"The bottom line is, it can have a very serious impact on trout populations for a period of time, which could be years."

Action plan

To further prevent the spread ofwhirlingdisease, Alberta is

• quarantining all commercial fish culture operations until each facility has tested negative forwhirlingdisease, and
• ceasing provincial fish stocking until each of the five facilities has tested negative for thedisease.

In order of potential risk, from highest to lowest, the movement of fish, mud or sedimentand water can spreadwhirlingdisease.

It can be transmitted through equipment used for swimming, paddling, boating, water pumping and fishing, or through infected fish and fish parts.

The province is therefore urging anglers, boaters and recreational water users to thoroughly clean all oftheir equipmentand remove any water, mud, or plant material from their property before and after each use.

AlbertaEnvironment and Parks will establish aspecial committeewith representatives from various federal agencies to implement procedures to identify, test and managewhirlingdisease.

The province has asked thatwhirlingdiseasebe added to the agenda at the upcoming Canadian Council of Ministers of the Environment at the end of September due to its potential economic and recreational impact.