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Old 07-15-2019, 12:53 PM   #1
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Red Tide

I was in another thread where the topic of Red Tide came up and I take knowledge about red tide for granted. But it occurred to me there are others new to the west coast or new to boating and water activities in and around our coves, bays, beaches, etc.

So from Wiki:

"Red tide is a common name for algal blooms, which are large concentrations of aquatic microorganisms, such as protozoans and unicellular algae (e.g. dinoflagellates and diatoms). The upwelling of nutrients from the sea floor, often following massive storms, provides for the algae and triggers bloom events. Harmful algal blooms can occur worldwide, and natural cycles can vary regionally.[1]

The growth and persistence of an algal bloom depends on wind direction and strength, temperature, nutrients, and salinity.[1] Red tide species can be found in oceans, bays, and estuaries, but they cannot thrive in freshwater environments.[2][1] Certain species of phytoplankton and dinoflagellates found in red tides contain photosynthetic pigments that vary in color from brown to red. When the algae are present in high concentrations, the water may appear to be discolored or murky. The most conspicuous effects of red tides are the associated wildlife mortalities and harmful human exposure. The production of natural toxins such as brevetoxins and ichthyotoxins are harmful to marine life."

The general rule along coastal BC is that any month with an "r" in it, the water is okay. Any month without the letter "r", the water may or may not be okay.

You can google BC closures due to red tide which enters bivalve shellfish and thus eating those can be problematic:

https://www.pac.dfo-mpo.gc.ca/fm-gp/...index-eng.html

And a video that will help inform:

https://www.theweathernetwork.com/ne...-for-shellfish
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Old 07-19-2019, 12:48 PM   #2
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Article in the Victoria BC newspaper that red tide is in at many harbours in and about coastal BC (date: 19 July 2019). So if you go swimming or your pooch does, be aware of the water conditions you might encounter.
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Old 07-19-2019, 04:18 PM   #3
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Extremely helpful links, though I'm finding that the interactive map and the listing of subarea closures don't always agree with each other. For example area 17-17 is listed as open to some while the interactive map (if you hit the detailed info) says closed to all bivalve. Oh well, guess its better to be save and not harvest.
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Old 07-20-2019, 11:51 AM   #4
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Certain Pacific oysters recalled due to threat of paralytic shellfish poisoning
Shucking a Pacific oyster

A Pacific oyster is shucked in this June 18, 2010 file photo. (Ted S. Warren / AP)

The Canadian Press
Published Saturday, July 20, 2019 7:47AM EDT

OTTAWA - The Canadian Food Inspection Agency has announced a recall of certain Pacific oysters due to a marine biotoxin which causes Paralytic Shellfish Poisoning.

The oysters were processed by Union Bay Seafood Ltd. and Intercity Packers Ltd. with a harvest date of July 14, 2019.

They were sold in five dozen packages in British Columbia, Alberta and Ontario.
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Old 07-20-2019, 12:33 PM   #5
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Red tide is very common in the S.E. US, especially the southwest Florida, which had an epic case earlier this year.
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