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Old 27.06.2011, 16:56
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Re: Dead fish in Lake Geneva

I rather thought we did the beach goers a good deed. Better one neat pile near the garbage can than dead fish all along the water's edge where people walk hand in hand...
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  #22  
Old 27.06.2011, 16:58
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Re: Dead fish in Lake Geneva

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That is what worries me about swimming in lakes - the fact that they are a contained mass and are not regularly flushed out by tides.
I would've thought Lake Leman is regularly flushed by the Rhone flowing in at one end and flowing out to the Med at the other. But that's just me.
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Old 27.06.2011, 21:07
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Re: Dead fish in Lake Geneva

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I would've thought Lake Leman is regularly flushed by the Rhone flowing in at one end and flowing out to the Med at the other. But that's just me.
You'd think so but I read somewhere that it takes just over ten years for the waters of the Rhone to flow from one end of Lac Leman to the other. Not the most efficient of toilets!

This year, because of the extreme dry Spring weather, the level of the Rhone flowing through the Chablais was the lowest I've ever seen it so the flush was much less powerful. Maybe that has something to do with it.
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Old 27.06.2011, 21:17
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Re: Dead fish in Lake Geneva

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The little lady and I went out this weekend for a little swim in the lake outside of Lausanne and were a bit disturbed to see little fish, dead, floating all around us in the water, up and down the shore.

No one else seemed to pay any mind to it, so we went in ("when in Rome"), but I couldn't enjoy freshwater swimming like I normally do - perhaps I was spoiled living in rural VT, USA.

Anyone know the cause? Is it location (outside of a city), time of year or is something else going on???
You have that to a certain extent in all lakes in central Europe (Lac d'Annecy, Lac de Genève, Lac de Neuchâtel, Bielersee, Vierwaldstättersee, Zürichsee, Bodensee, Lago Maggiore, Lago di Lugano, Lago di Como, Lago di Varese, Lago Puccini, etc etc) somewhere in late June, early July. Which means when the water temperatures also down by 5 to 10 meter rises in a way which to many fish is too much. "Human influence" may come as an add-on, like sewage lead by mistake into the lake, Nestlé discarding spoilt chocolate substances into the lake, etc.
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Old 27.06.2011, 21:17
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Re: Dead fish in Lake Geneva

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You'd think so but I read somewhere that it takes just over ten years for the waters of the Rhone to flow from one end of Lac Leman to the other. Not the most efficient of toilets.
11.4 years.
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Old 27.06.2011, 21:18
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Re: Dead fish in Lake Geneva

and of course it doesn't flush after 10pm.
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Old 28.06.2011, 08:53
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Re: Dead fish in Lake Geneva

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That is what worries me about swimming in lakes - the fact that they are a contained mass and are not regularly flushed out by tides.
Well, the Mediterranean has no perceptible tide, either.

Tom
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Old 28.06.2011, 09:16
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Re: Dead fish in Lake Geneva

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That is what worries me about swimming in lakes - the fact that they are a contained mass and are not regularly flushed out by tides.
I think that most of them have their own balance of a mini ecosystem which keeps them clean, healthy and in good condition. It's when the ecosystem is upset and knocked off balance which can then lead to to the water going stagnant.
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Old 28.06.2011, 13:49
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Re: Dead fish in Lake Geneva

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Old 29.06.2011, 11:46
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Re: Dead fish in Lake Geneva

Our commune responded to our concerns by quoting a recent newspaper article [in French]:

"Ce phénomène a déjà été observé en plusieurs endroits de la région depuis quelques jours. Je vous remets ci-dessous copie de l'article paru dans le quotidien "La Côte" le 24 juin dernier qui vous donnera les raisons de la prolifération de ces poissons morts. Aucune pollution n'a été constatée à l'endroit que vous mentionnez.

Article du quotidien "La Côte":

La plage de Rolle n'a pas été épargnée par les perches échouées.

«Enormément de perches sont nées ces derniers temps!», affirme Joël Vuadens, pêcheur. «Il n'y a vraiment pas de quoi s'alarmer», confirme Frédéric Hofmann, conservateur de la pêche et des milieux aquatiques. Car si les questions se posent quant à la bonne santé des perches, c'est que plusieurs d'entres elles se sont échouées, mortes, ces derniers jours sur les bords du Léman, entre Ouchy et Nyon.

«Ce phénomène est dû à plusieurs critères, explique Joël Vuadens. Le bon frai du mois de mai est une explication, et c'est plutôt une bonne nouvelle car cela prouve que la population est importante. Si les perches ont faim pendant quinze jours car elles sont trop nombreuses et se retrouvent en concurrence, certaines ne survivent pas. Mais ce qui est sûr, c'est que la pêche se porte bien cette année.» Tentative de complément d'explication de Frédéric Hofmann: «c'est un phénomène naturel. Le réchauffement précoce des eaux qui a eu lieu ce printemps peut favoriser le développement de certaines maladies, mais nous n'avons pas effectué d'analyse. Il peut également augmenter le niveau de stress des poissons.» Paradoxe donc, puisque ces perches mortes sont preuve d'une belle année pour le poisson phare du Léman.

[rough translation] In short, it is a natural process that has to do with both an overpopulation of perch (and thus increased competition for food) as well as the unusually warm weather in the spring (and thus caused the fish some stress). In any case, it is of no concern to swimmers and is beneficial for fishermen.

Last edited by M. Ploymi; 29.06.2011 at 11:47. Reason: bold
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