The British daily The Guardian reported on the 27th (local time) that red lesions and white mold were also observed in salmon from the Columbia River, based on a video filmed by Columbia Riverkeeper.
“The red trout unexpectedly changed course while coming up from the sea to the river to spawn,” said an official from the group. “It’s like trying to avoid a burning building.”
The official said, “A lot of scars were also found on the red trout, which is due to stress and elevated water temperature.”
The white patches on the salmon’s body are fungal infections caused by stress caused by rising water temperatures.
In the United States, the law stipulates that the water temperature in the area should not exceed 20 degrees Celsius to protect salmon, but the current water temperature reaches 21 degrees Celsius, which is fatal, the group explains.
It’s like running a marathon in a temperature over 38 degrees Celsius.
According to a video filmed earlier this month by the group, the salmon will not be able to spawn in the river’s tributaries and will die from disease and high temperatures.
It is still too early to judge how much salmon will die in the aftermath of the rising water temperature. However, over the next two months or so, the number of dying salmon is expected to increase as the water temperature rises.
Earlier in 2015, there was a precedent that 250,000 salmon died in the Columbia River due to rising summer temperatures.
In northern California, a drought caused water levels to drop, causing parasites to multiply and kill hundreds of thousands of salmon cubs, the Associated Press reported.
In the Sacramento River, almost all of the Chinook salmon fry are at risk of death due to unusually high temperatures.
The death of salmon juveniles is expected to affect total populations and shorten fishing seasons, resulting in an economic loss of $1.4 billion in California alone.
In addition, salmon prices soared, affecting prices.
Separately, recent large-scale wildfires in the North and West of the United States and Canada have also begun to destroy ecosystems.
Hundreds of people have already died in the wildfires, and it is estimated that more than a billion marine life is lost, the Guardian said.
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