A BROOK was discovered to be “full of dying eels” this weekend, after a suspected poisoning.
Passers by noticed the grisly scene on Saturday in Henllan Brook, east of Denbigh.
Environmental officers said there was a “strong smell like detergent or bleach”.
The discovery was made after heavy rain Saturday morning.
Resident Tracey Green was at the scene on Saturday afternoon.
She said: “The stream behind Twm O’r Nant was full of dying eels... attempts were made to save them but it looks like they were poisoned by some pollution.
“Environment agency came out took samples, took dead eels away for testing and said they would investigate.”
A spokesman for Natural Resources Wales said officers had been alerted: “They went out to investigate and found eight or nine dead eels and some sticklebacks.
“They said there was a strong smell like detergent or bleach.
“They have taken samples which are currently with our lab.”
He said the environment management team were currently investigating the incident and trying to trace back the problem to its source.
He said three or four more dead eels were found on Monday morning.
But, he said: “It happened before the brook had reached the main river, so we don’t anticipate any further problems.”