The 'French Chernobyl' that has poisoned the Rhône's fish

From a wooden jetty, Cédric Giroud gazed out over the wide bend of the river Rhône, a picturesque, dark blue expanse dotted with swans. "At midnight on summer nights, when I'd finished fishing and boxed up my catch, I'd slip into the water and swim in the moonlight," he said.

The swell in the Rhône at the Grand Large just outside Lyon draws tens of thousands of French tourists on holiday weekends. It is a haven for rowers, sailors, fishermen and children feeding ducks. But under the crystal clear water lurks an environmental disaster the conservation group WWF is calling "a French Chernobyl".

The French government has banned the consumption of fish from the length of the Rhône - where it enters France from the Swiss Alps all the way down to the Mediterranean - after local specialities such as bream, pikeperch, carp and catfish were found to contain high levels of the toxic chemicals PCBs. France's second longest river has contaminated sediment in its bed and feeding fish have sent the toxins through the food chain. Environmentalists say the poison Rhône, which flows through tourist spots such as the papal city of Avignon down to the Camargue delta, is the tip of the iceberg of French industrial pollution, which the government has recklessly ignored for 20 years.

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