Author: Laura Devlin - BBC News

Sewage was quickly removed as the cause of fish deathsThe mystery of what caused the death of 100,000 fish in the River Nene near Peterborough last month will not be solved after an investigation drew a blank.Fish were found washed up on the river bank between Orton Backwater and Goldie Backwater, and in Ferry Meadows park, on 12th December.The Environment Agency tried to establish the contaminant, after removing the sewage.”We believe that the pollutant that had a significant effect on the fish passed through for a short period of time and so we were unable to trace the source,” it…