Cockles have been harvested in Wales for centuries, but is better water quality harming them?
Between 1958 and 2009 water quality around the south Wales coast has been massively improved and before 1997 wastewater effluent was discharged into the estuary from seven sewage plants.
"Studies of cockles across south Wales show they're amazingly adaptable to their surroundings," she said. As the water has got cleaner, adult cockles have been unable to grow to their maximum size, though their numbers have increased.In the past dominant adult cockles could live for up to three or four years, however in cleaner water, they tend to die inside a year or two.
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