Fisheries officers stepped in after fish including more than 50 large bream, roach, tench, perch and pike were found dead on Wissey Pools, near the Wissington Sugar Factory.
Tests revealed low oxygen levels, believed to have been caused by low flows during the ongoing drought. The Wissey is shallow, particularly upstream of the pools where there is a large, silted mere.
The EA has placed aerators near Wissington bridge and further downstream on the Hilgay village stretch (pictured). Experts are now monitoring oxygen levels in the river daily.
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