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Energy firm ESB are being called to renew the traps at Ardnacrusha dam in Co Clare.
Sinn Fein made the call after it was revealed that exceptionally low numbers of much needed eels were trapped and transported in 2015.
MEP Liadh Ní Riada said: "Hundreds and thousands of critically endangered juvenile European eels are right now trying to migrate into Irish waterways but due to the mismanagement of the trap and transport scheme at Ardnacrusha dam, this is proving impossible.
"It has emerged in recent days that just 11.42kgs of elvers were trapped and transported by ESB at Ardnacrusha hydroelectric station in 2015, due to incompetence and negligence.
"The equipment being used for this scheme is outdated, not fit for purpose and in dire need of being replaced.
"There is an abundance of juvenile eels migrating, because the traps are failing, the eels are climbing up walls and spillways, entering cooling water outflows, going up onto ledges and under rock fill and platforms, dying and being preyed on."
(CD/MH)
