Anglesey river environmental improvements for sea trout migration

Feb 9, 2015

Llyn Coron - March 2015

Anglers are hoping for a bumper sea trout spawning season after a river restoration project was completed in time for 2015. Riverbanks alongside Afon Gwna, Anglesey, were remodelled to prevent cattle disturbing the stream, which flows from Llyn Coron to the sea at Aberffraw. As well improving the prospects for spawning fish, it is hoped the work will also reduce the extensive algal blooms that have occurred in Llyn Coron in recent years.

Some 850m of riverbank were fenced off and drinking bays installed by members of the Clwyd, Conwy & Gwynedd Rivers Trust (CCGRT). Crossing points were also installed in each field, with hardcore ramps to the water’s edge, to reduce the amount of silt trodden into the channel. Overhanging trees were thinned and the coppiced material was used to repair eroded bank sections.

Trust chairman Roger Thomas said the project was a partnership between the CCGRT and Afonydd Cymru, involving the Bodorgan Estate and an independent landowner. He said: “It is hoped this work will improve the sea trout spawning potential of the stream from 2015 onwards.

“The Trust and the Bodorgan Estate will be monitoring the results closely during the next and subsequent spawning seasons.”

A survey of the Afon Ffraw system, undertaken by the Trust in 2013, found that much of the stream and its tributaries were affected by the overgrazing of bank side vegetation. As a result, sediment had settled on much of the riverbed, smothering the spawning gravels essential for migratory fish. The survey also identified a number of other streams and rivers that could also be improved by corridor fencing.