Canada Escaped Atlantic salmon reported 250 km north of collapsed fish farm

06:40  14 september  2017
06:40  14 september  2017 Source:   cbc.ca

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Escaped farmed Atlantic salmon have swam as far as 250 kilometres north of Washington state's San Juan Islands, where they broke free from a ruptured pen containing an estimated 305,000 fish broke last month.

Atlantic salmon escape sites Atlantic salmon farm sites. 15 km . Atlantic salmon reports were received from a total of 249 boats. Fishermen who reported catching Atlantic salmon were asked to hold the fish on deck for pickup.

Escaped Atlantic salmon reported 250 km north of collapsed fish farm © Canadian Press Escaped Atlantic salmon reported 250 km north of collapsed fish farm

Escaped farmed Atlantic salmon have swam as far as 250 kilometres north of Washington state's San Juan Islands, where they broke free from a ruptured pen containing an estimated 305,000 fish broke last month.

The non-native species of salmon have been reported as far north as Tofino on the west side of Vancouver Island and Campbell River on the island's east side, according to Byron Andres, head of the federal Atlantic Salmon Watch program.

"Quite a distance. I'm not sure whether we should be surprised by that but they have travelled further than I initially anticipated," Andres told Gregor Craigie, host of On the Island.

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Still from video showing the broken pens of 300,000 Atlantic salmon that escaped from a fish farm off Cypress Island in Washington State. Due to conservation efforts and lobbying in the early 2000s, no fish farms are currently operating along B.C.’s North Coast.

More than a week after a fish farm collapsed south of the border, there are now reports that the escaped Atlantic salmon are being found in B.C. waters. Andrew Thomson, regional director of fisheries management for Fisheries and Oceans Canada (DFO)

The Atlantic Salmon Watch program has been monitoring B.C. waters since 1991 and in that time has rarely logged confirmed sightings.

Between 2011 and 2017, there were only three confirmed reports of Atlantic salmon in B.C., with some appearing as far north as Hecate Strait and the Kitimat River. There had been zero reports in the three years leading up to the escape.

Since the spill on Aug. 19, Fisheries and Oceans has fielded about 40 reports of Atlantic salmon in B.C. waters.

Meanwhile, Indigenous fisherman with the Lummi Nation in Washington State claim to have caught more than 43,500 of the fish, which are classified as an invasive species in the U.S.

While none of the recent 40 reports have been confirmed, Andres said the department is relying on the public to help track the movement of the fish while it prioritizes recovery efforts.

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- The thousands of Atlantic salmon that escaped a collapsed net pen off Cypress Island on Aug. Cooke Aquaculture, which owns the fish farm and is responsible for the clean-up, started pulling equipment from the water on Tuesday.

The Washington state fish farm that collapsed allowing many thousands of Atlantic salmon to escape into the Pacific showed signs of trouble last month, and was slated for upgrades. In late July, the Cooke

Fishers are asked to keep the carcass or head of any Atlantic salmon they catch and to give the parts to officials.

"If they could preserve the head and the gut content so that I can recover that from them, we have some analysis we'd like to do with that tissue," Andres said.

The stomach contents of the fish will be analyzed to determine how effectively Atlantic salmon have been able to feed in the wild while the heads will be used for identification purposes.

  • Collapsed fish farm that released thousands of Atlantic salmon had structural problems last month
  • Will escaped Atlantic salmon survive — and thrive — in B.C. waters?
  • Salmon spill prompts open-net fish farm critics to tout benefits of land-based aquaculture

In search of the otolith

Specifically, scientists are looking for otolith bones, inner-ear bones that retain a unique signature specific to the farm they originate from and help trace farmed fish back to their source.

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19 when a pen containing 305,000 salmon collapsed in U.S. waters about 150 kilometres to the south at a Cooke Aquaculture fish farm . Concerns have been raised that escaped Atlantic salmon could compete with their Pacific cousins for food, interbreed with them or introduce disease.

Otolith bones grow in layers over the duration of a fish's life. When a fish is in the hatchery, water temperature is controlled to affect how the bone grows which creates a "thermal imprint" on the otolith.

"They increase and decrease the temperature of the water so that the otolith is laid down in a very distinctive pattern like tree rings," he said. "It could be done with DNA as well but the otolith is much cheaper."

The incident ignited debate surrounding controversial farming of Atlantic salmon in B.C. and prompted Indiginous groups to occupy two B.C. fish farms

The B.C. Salmon Farmers Association said escapes are rare north of the U.S. border because farms here are built to a higher standard than in the U.S.

The company the salmon escaped from blamed high tides, currents and the coinciding solar eclipse for the collapse of the pen.

But the site near Cypress Island was experiencing structural problems about a month before the collapse and was slated for upgrades, according to Cooke Aquaculture.

With files from CBC radio One's On the Island

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