Residents in Telford who complained about a fishy smell coming from their drains have been told it was caused by dead piranhas, which had likely been flushed down the toilet.
Severn Trent Water says, when it investigated the sewers in Madeley, it also found a number of other dead fish.
It is not the first time sewers in Shropshire have been blocked by odd items - in January sewers in Ditton Priors, near Bridgnorth, were found to be blocked by piles of pants that had been flushed down the toilet.
Sue Fulford, customer operations manager for Severn Trent Water said: "The drains that take waste water away from your home are only a few inches wide and are only meant to take water, toilet roll and human waste.
"Toilet roll is meant to break down when it gets wet so it washes easily through the system."