Environment Agency officials are confident last week's pollution scare in an Oxfordshire brook has not contaminated any other waterways.
Around 100 fish - including protected bullhead and brown trout - were spotted floating on the water of Shill Brook near Carterton on Thursday.
Dead fish and samples of the water have been taken away to determine what caused the marine life.
A spokesman for the Environment Agency said tests were ongoing, but there has been no reports of fish in other waterways or rivers in the area being affected.
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