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Experts puzzled by disappearing fish

The Birs river in canton Bern was always full of fish - and particularly trout - but now there's a problem. Recently, hardly any fish have been seen in a two kilometre section of the river. Thousands of creatures have disappeared. Fishermen and the authorities are puzzled. (SRF/swissinfo.ch)

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SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR

SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR