Unusual numbers of sea-birds at Teesmouth in August 1962.--In August 1962 huge concentrations of Sprats Clupea sprattus appeared in the bay and estuary of the River Tees, on the border of Co. Durham and Yorkshire. Many of the fish entering the mouth of the river were killed by the industrial pollution, with the result that the mudflats and sand-bars quickly became lined with dead and dying Sprats,...

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