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Mussels attack Swiss lakes, finish fishing webs and threatening wildlife

Angler Claude Delley rattles the metal frame of his web versus the side of his boat on Switzerland's Lake Neuchatel, trying to get rid of dozens of tiny, brown mussels.

Some plop back into the water however most sit tight. The sharp shells of the creatures - a fast-spreading, invasive species originally from the Black Sea - work away at the netting, suggesting he needs to change it twice as often as before.

There is no option, he said. As quickly as the mussel clings to the web, it stays there.

It is not just the webs. The Quagga mussels have actually blocked undersea pipelines. Stéphan Jacquet, one of a group of researchers studying the species, stated he had actually seen Swiss local crayfish, whose population remains in decline, encrusted in the animals, threatening suffocation.

The mussels also consume substantial amounts of microscopic plants called phytoplankton, leaving less for other lake animals to eat.

Potentially all biological classifications and significant links in the food cycle can be impacted, Jacquet, who operates at the INRAE CARRTEL lab even more south in Thonon-les-Bains, said.

The mussels were very first identified in Switzerland in the River Rhine near Basel in 2014. Ever since they have spread to colonise at least six Swiss lakes consisting of Lake Geneva.

The population, which has few predators, is poised to increase approximately 20 times in Switzerland in the next two decades, according to a 2023 study by marine research institute Eawag and Swiss universities based upon trends seen in the Fantastic Lakes of the United States considering that the 1980s.

The mussels are currently present in France and Germany.

It is not understood precisely how each lake was invaded, however mussel larvae can spread on rivers or currents and be introduced into brand-new bodies of water when boats or devices are moved.

As soon as in, the species multiplies quickly with one individual capable of producing numerous countless larvae.

When we look undersea, we can see that it has an rapid colonisation, really considerable, as these communities are now completely covered, from the surface to the depths, Jacquet said.

Some Swiss lakes have actually been spared, consisting of Lake Zurich and Lake Lucerne. In some locations, authorities are now thinking about new rules for cleansing and shipping boats to stop the spread.

(source: Reuters)