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Old 29.07.2021, 09:08
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Cyanobacteria (blue-green algae) in Swiss lakes 2021

FYI for folks in Schmerikon (SG) on the Aabach riverfront area:

Last week three dogs who had been walking in the area suddenly died. Two dogs were playing together on the bank and in the water, another puppy on the other side of the river. Shortly thereafter the dogs suddenly showed signs of muscle paralysis and symptoms akin to an epileptic seizure. Unfortunately despite getting them quickly to the vet, all three dogs died. A fourth dog also showed similar symptoms but thankfully recovered.

Initially the vet thought that blue algae might be the reason, but so far the canton says that is unlikely.

At present it is unclear what caused the dogs' deaths.

Dog owners are advised to avoid the area, do not go in the water.

Article from Linth24:
https://linth24.ch/articles/78329-sc...vergiftung-tot
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Old 30.07.2021, 17:20
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Re: Aabach Schmerikon SG: Three dogs have died

According to this article in the 20 Minuten, five dogs have now died after playing in the Aabach area.

A water sample was analyzed, and it was found that blue algae was indeed present.

(Authorities were skeptical at first, as weather conditions were unfavorable to produces blue algae.)

Dog owners are advised to avoid the area until mid August. The cantonal water authoriy will re-assess water conditions then.


https://www.20min.ch/story/fuenf-hun...n-396831180059
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Old 25.08.2021, 11:53
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Re: Aabach Schmerikon SG: Three dogs have died

After eight dogs died at the Obersee the same problem seems now to have reached the Hüttenersee!
Please everyone be careful

https://www.nzz.ch/zuerich/blaualgen...see-ld.1641877
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Old 26.08.2021, 10:36
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Re: Aabach Schmerikon SG: Three dogs have died

Heartbreaking

Thank you for sharing
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Old 26.08.2021, 12:20
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Re: Aabach Schmerikon SG: Three dogs have died

Thanks for the update, IrishTemptation.

This is indeed worrying, as we often walk the Hüttnersee area. (Glück in Unglück, thanks to my increasing wobbliness I haven't been there in a few weeks.)

Question for folks in the area: Does the Hüttnersee feed or run into the Itlimoosweir?
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Old 26.08.2021, 13:13
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Re: Aabach Schmerikon SG: Three dogs have died

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Thanks for the update, IrishTemptation.

This is indeed worrying, as we often walk the Hüttnersee area. (Glück in Unglück, thanks to my increasing wobbliness I haven't been there in a few weeks.)

Question for folks in the area: Does the Hüttnersee feed or run into the Itlimoosweir?
I only checked Google Maps but the "Krebsbach" seems to "connect" the two. But I don't know which one feeds into which one. Which one is higher up? What direction does the water flow? https://www.google.ch/maps/place/Itl...1857!4d8.69225
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Old 26.08.2021, 14:33
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Re: Aabach Schmerikon SG: Three dogs have died

I stopped walking the dog along the Bielersee since about a week, when I heard about blue algae in the Bodensee and Zurichsee, this in spite of never hearing any reports of blue algae concentrations in the region.

It seems to me that the authorities wait until enough dogs have died before doing any meaningful tests, so I'm not taking any chances. It will be walks in the forest for the time being.
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Old 26.08.2021, 14:44
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Re: Aabach Schmerikon SG: Three dogs have died

Is there anyway to identify potentially harmful water or algae. Is all algae bad? How vigilant does one need to be? How does one be careful? What to look out for? Inspect every body of water my dog wants to drink from etc?

Many thanks.
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Old 26.08.2021, 23:09
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Re: Aabach Schmerikon SG: Three dogs have died

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Is there anyway to identify potentially harmful water or algae. Is all algae bad? How vigilant does one need to be? How does one be careful? What to look out for? Inspect every body of water my dog wants to drink from etc?

Many thanks.
Blue algae isn't actually algae. Basically if there's a blue coating on the water watch out.
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Old 26.09.2021, 09:17
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Re: Aabach Schmerikon SG: Three dogs have died

Update:

Yes, Blue algae has been found in the Itlimoosweiher, Wollerau SZ; I saw a warning sign up today.

Also, a dog became ill, but thankfully recovered, in Freienbach SZ. It is thought the dog drank lakewater, but the report does not specify exactly where.
https://www.pilatustoday.ch/zentrals...takt-143685631

Apparently also in the Greifensee some weeks earlier. Also the Haliwallersee.

Also the Rotsee (LU) - apparently concentrations are not as high, but caution is advised.
https://www.pilatustoday.ch/zentrals...ueck-143832340

Also in Wallis, Lac de la Corne in Siders and the lake by TCS-Campingplatz in Sitten.
https://www.blick.ch/schweiz/vorsich...d16815658.html

Two interesting reports from SrF:
https://www.srf.ch/wissen/natur-tier...ert-die-gefahr

https://www.srf.ch/play/tv/-/video/-...1-4e20ad01b261

---

Bottom line:

Cyanobacteria is present in many bodies of water, in low concentrations it is not really dangerous. However, when the bacteria becomes concentrated is can be very dangerous, potentially deadly for dogs.

If you walk by water, check with your cantonal website or your Gemeinde regularly for updates. Don't let your dog go into any body of water whose status you have not recently checked.

Here is a flyer put out by canton ZH with pictures showing you what blue algae looks like:

ZH:
https://www.zh.ch/content/dam/zhweb/..._blaualgen.pdf


When in doubt, keep your dog out of the water until you have checked current conditions. Better safe than sorry. And of course if you have even the slightest concern after your dog has been in the water, get to the vet asap.
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Old 26.09.2021, 13:14
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Re: Cyanobacteria (blue-green algae) in Swiss lakes 2021

Cyanobacteria (a life form with features of both bacteria and algae, but is neither fish nor fowl) are not only hazardous to dogs; they produce Anatoxin-a (Very Fast Death Factor), a neurotoxin. Here is a terrible story from CA; they've closed sections of the Merced River because of it:

https://www.fresnobee.com/news/local...254080593.html

Last edited by bossybaby; 26.09.2021 at 13:30.
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