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Old 30.07.2020, 22:29
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Beaches closed and swimming in Neuchâtel lake not recommended

Following the death of several dogs yesterday several beaches (Between Colombier and Areuse) have been closed for both dogs and humans and it has been recommended that people (and dogs) don’t swim in other parts of the lake.

It was initially suspected that foul play was involved but it is now believed that Cyanobacteria is the cause.

Article in french

https://www.rts.ch/info/regions/neuc...neuchatel.html
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Old 30.07.2020, 22:34
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

Oh my god, that’s horrendous, poor dogs and poor owners
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Old 31.07.2020, 08:10
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

And also mites earlier this month


Several bathers had been bitten by autumn mites on a beach in Concise VD on the shores of Lake Neuchâtel. As a result, the community had to close the beach.


https://www.nau.ch/news/schweiz/conc...essen-65737315
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Old 31.07.2020, 10:20
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

I'm in Portalban right now which is opposite of where the bacterial problem is. Authorities say they will close down the entire lake later today if the area is still testing positive...as per my brother-in-law. The wind is coming from our side of the lake at our camping site in La Nacelle so I do not forsee a problem at least today where we are.
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Old 31.07.2020, 12:04
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Blue-green alguae- several dogs die Lake Neuchâtel

several dogs have died 20 mins after showing symptoms- after bathing on the North shore of the lake. I have been going to my favourite beach on the south shore a lot recently, and no issue. Advice is now not to bathe in the lake at all Sorry I see another person has already posted about this. Mods can delete.
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Old 31.07.2020, 12:04
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

So very sad, I read about it in the news this AM. I can't imagine the pain of those poor owners...

Does anybody know what causes the bacteria? Isn't Lake Neuchatel normally very clean?
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Old 31.07.2020, 12:07
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

it seems the culprit is blue-green alguae- tests will confirm soon.
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Old 31.07.2020, 12:12
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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So very sad, I read about it in the news this AM. I can't imagine the pain of those poor owners...

Does anybody know what causes the bacteria? Isn't Lake Neuchatel normally very clean?
There is algae in the lake which can produce this bacteria in shallow, stagnant water if the temperature rises.
It has been very hot here recently and there are several areas along the lake shore where the water is shallow for quite a distant and without much movement. These areas are popular with families for obvious reasons.
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Old 31.07.2020, 12:27
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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So very sad, I read about it in the news this AM. I can't imagine the pain of those poor owners...

Does anybody know what causes the bacteria? Isn't Lake Neuchatel normally very clean?

Some info here on general causes.
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Old 31.07.2020, 12:41
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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There is algae in the lake which can produce this bacteria in shallow, stagnant water if the temperature rises.
It has been very hot here recently and there are several areas along the lake shore where the water is shallow for quite a distant and without much movement. These areas are popular with families for obvious reasons.
They should borrow the Seekuh (lake-cow, a machine they cut these algaes about twice a year since like for ever down to about 1.8meters) from Zug.

Algae is an important biosphere for fish - specially small fish - which is why they don't cut it too often and only where necessary (swimmers, boats).

Seekuh at work:

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Old 31.07.2020, 12:53
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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They should borrow the Seekuh (lake-cow, a machine they cut these algaes about twice a year since like for ever down to about 1.8meters) from Zug.

Algae is an important biosphere for fish - specially small fish - which is why they don't cut it too often and only where necessary (swimmers, boats).

Seekuh at work:

We have those here too, no need to borrow one at all.
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Old 31.07.2020, 13:09
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

Seekuh is going to be my new rock band, I think. Such a good name for such a good creature.

Apparently they now search for presence of this bacteria in rivers (VD), as well. https://www.24heures.ch/la-bacterie-...s-982598388694

Sorry, that it is behind a subscr. wall.
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Old 31.07.2020, 14:29
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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Seekuh is going to be my new rock band, I think. Such a good name for such a good creature.

Apparently they now search for presence of this bacteria in rivers (VD), as well. https://www.24heures.ch/la-bacterie-...s-982598388694

Sorry, that it is behind a subscr. wall.
That article says ‘rives’ not ‘rivières’ so they’re checking all the banks of lake Neuchâtel in Vaud to see if there is contamination there too.
It’s not commonly found in rivers as the water is moving there, it propagates in warm, stagnant water.
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Old 31.07.2020, 15:30
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

Good news then, thanks! I don't know the bug but it sounds nasty.
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Old 01.08.2020, 07:03
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

Some cyanobacteria can produce neurotoxins, cytotoxins, endotoxins, and hepatotoxins (e.g., the microcystin-producing bacteria genus microcystis), which are collectively known as cyanotoxins.

Specific toxins include, anatoxin-a, anatoxin-as, aplysiatoxin, cyanopeptolin, cylindrospermopsin, domoic acid, nodularin R (from Nodularia), neosaxitoxin, and saxitoxin. Cyanobacteria reproduce explosively under certain conditions. This results in algal blooms, which can become harmful to other species, and pose a danger to humans and animals, if the cyanobacteria involved produce toxins. Several cases of human poisoning have been documented, but a lack of knowledge prevents an accurate assessment of the risks.[110][111][112]

Recent studies suggest that significant exposure to high levels of cyanobacteria producing toxins such as BMAA can cause amyotrophic lateral sclerosis (ALS). People living within half a mile of cyanobacterially contaminated lakes have had a 2.3 times greater risk of developing ALS than the rest of the population; people around New Hampshire's Lake Mascoma had an up to 25 times greater risk of ALS than the expected incidence.[113] BMAA from desert crusts found throughout Qatar might have contributed to higher rates of ALS in Gulf War veterans.[111][114]
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Old 01.08.2020, 07:53
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

People being people in La Côte, many went to emergency rooms yesterday due to confusing/linking Lac Neuchâtel with exposure to Lac Leman and wanting to be screened for infection
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Old 01.08.2020, 08:19
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

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People being people in La Côte, many went to emergency rooms yesterday due to confusing/linking Lac Neuchâtel with exposure to Lac Leman and wanting to be screened for infection
Could be the new " corona"! Swiss made by our pollution
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Old 03.08.2020, 15:50
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

Hopefully these storms and cooler weather will help the situation a bit...!
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Old 03.08.2020, 21:40
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

Too much phosphorus dumped into the lake...probably from detergents... these bacteria are multiplicate on phosphorus...
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Old 03.08.2020, 23:00
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Re: Beaches closed and swimming in Neuchâtel lake not recommended

Do you have evidence to that, I would be very interested. It seems that Lake Murten and the South shore were not affected- not so many inhabitants and the Grande Cariçaie nature reserve too. Lots of rain and much colder weather hopefully helped- I will stick to 'my' south shore.
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