Tag Archives: Salmon migration

Rivers & Oceans

The Chum Return to Basil Creek

The Chum started returning to Basil Creek a week ago. To an inexperienced eye, the water levels seemed too low on the 16th, but dozens of large salmon were progressing upstream beyond the culvert. Christine Robinson said that she and her husband Cec had seen them the previous day. That was when we agreed to do this interview. 

“We know it’s the big year in their four year cycle. Chum primarily have a four year cycle, a few of them three, and a few of them five, but the majority have a four year cycle.  In 2020, four years ago, approximately 1100 fish came back to Basil Creek. Four years prior to that, in 2016, there were about 1100. We’re not alone in this. All the creeks are in a similar cycle. Basil Creek, of course, is the main stream on Cortes for salmon return. So we’re optimistic that it should be a big year this time,” explained Cec Robinson, one of the principal Streamkeepers on Cortes Island.

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Rivers & Oceans

Baby sockeye salmon are growing faster due to climate change. Is bigger better?

Editor’s note: Most of the salmon on Cortes Island are Chum, not Sockeye, but a DFO study of scale growth measurements from the Big Qualicum River suggests Chum are also being affected by climate change. Chum salmon appear to be growing smaller ‘due to increased ocean temperatures driven by climate change‘ and also the increased competition over a diminishing number of prey. There are also reports of them relocating to more northern locations. In October 2023, a University of Alaska study revealed that 100 Chum had been found in waters emptying into the Arctic Ocean. They were ‘either actively spawning or had finished spawning.’ Lead author Peter Wesley wrote, “Throughout most parts of the salmon’s range, things have gotten too warm and they’re starting to blink off. In the Arctic, the water is getting warm enough and they’re starting to blink on.”

Canada’s National Observer, Local Journalism Initiative Reporter

Climate change has tipped the scales, causing juvenile sockeye salmon in B.C. to grow bigger over the past century. 

The growth of salmon using lakes as nurseries during the first years of life in northern B.C. is about 35 per cent higher than 100 years ago, a new study from Simon Fraser University shows. 

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Rivers & Oceans

The three sea lice monitoring windows

Taken from a BC Salmon Farmers Association email to Cortes Currents

Salmon farm conditions of license specify area-based and site-specific sea lice monitoring requirements for each farm. In general, the sea lice-related conditions of license divide each year into 3 sea lice monitoring ‘windows’ defined by the out-migration pattern of the juvenile salmon:

  • Non-migration Window: July 1 – January 31
  • Pre-migration Window: February 1 – February 29
  • Out-migration Window: March 1 – June 30.
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