THOUSANDS of fish are thought to have died after pollution leaked into the Sixmilewater River.
And the Ballynure Angling Club which holds the fishing rights to the affected stretch of water says it could take years for the river to recover.
Local girl, 11-year-old Julia Wilson, daughter of Ballynure Angling Club member Sam Wilson, spotted the dead fish close to the Isle of Man Bridge as she was out for a walk along the river on Sunday afternoon.
The Environment Agency has begun an investigation at the scene. It has said the environmental impact is of a 'high severity'.
Billy Robinson, Chairman of the angling club said mainly young salmon and brown trout had been killed.
"This is absolutely devastating, the river will take years to recover from this incident.
"This is the latest fish kill, there have been several over the years and a lot of the members can't believe it has happened again.
"We are holding our AGM soon and will be asking our members to pay for fishing which we can't provide," he said.
"We've no idea how this happened yet, there is a sewage treatment works and a number of businesses along the river which could be responsible, but we will just have to wait for the Environment Agency's report."
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