Afon Crychddwr, near Llanllyfni: creation of a rock ramp fish pass

The obstruction on the Afon Crychddwr prior to the start of the project


Work in progress to build the fish pass on the Afon Crychddwr



(Issued 13 November ‘13)
New fish pass will benefit fish stocks
As the 2013 salmon and sea trout spawning season gets under way, anglers and
conservationists are eagerly looking for signs of success of a project to improve access by
migratory fish to a Gwynedd stream as the result of the recent removal of a major obstruction.
The project, on the Afon Crychddwr, near Llanllyfni, involved the creation of a rock ramp
natural fishway to replace a concrete slipway which had historically presented a problem for
fish trying to access spawning grounds upstream of this location.
After diverting the flow of the stream through pipes to by-pass the site, the work involved the
use of boulders to create a series of shallow cascades with resting pools between each one.
A number of oak baffles were also fitted at the head of the ramp and into a tunnel under a
railway bridge to improve water level and help fish negotiate what was previously a smooth
surface with a shallow water flow that was difficult to negotiate under most conditions.
The project was jointly organised by Afonydd Cymru and the Clwyd, Conwy & Gwynedd
Rivers Trust and is part of the Environmental Improvements to Sustain Welsh Fisheries
project (EISWF). The cost of the project was £22k with 75% of the finance being made
available by the European Fisheries Fund and the remaining 25% match funding coming from
the Welsh Government.
Commenting about the project, Afonydd Cymru project officer for North Wales, Richard
White, said: “The work, which took two weeks to complete, changed the profile of the river
over a length of about 30m easing the gradient over a height difference of more than 2m.
Now that the work has been completed, it will make access to about three kilometres of
spawning ground much easier for native brown trout and migratory fish.”
Expressing his delight about the scheme, Roger Thomas, chairman of the Clwyd, Conwy
& Gwynedd Rivers Trust, said: “This is the Trust’s first major project in Gwynedd since
it expanded its activities into the county earlier this year and I believe it demonstrates the
Trust’s commitment to get involved with strategic environmental projects in the region.”
Congratulating both organisations on completing the project, Dr Robin Parry, chairman of the
Seiont, Gwyrfai & Llyfni Angling Association. Said: “The trust’s recent expansion to cover
Gwynedd is welcome. This work will boost fish spawning in Afon Llyfni. Local anglers will be
encouraged by this contribution to aquatic habitat restoration and will look forward to working with
the Clwyd, Conwy & Gwynedd Rivers’ Trust and Afonydd Cymru on similar environmental projects
in the future.”

The fish pass on the Afon Crychddwr after the work was completed

For further information, please contact one of the following people:
• Roger Thomas, Chairman of the Clwyd, Conwy & Gwynedd Rivers Trust. Tel: 01492 641324 / 07802
• Dr Robin Parry, Chairman of the Seiont, Gwyrfai & Llyfni Angling Association. Tel: 01286 872211/
07818 434490
• Richard White, Afonydd Cymru, North Wales Project Officer. Tel: 07815 837359