NRW river projects set to boost fish habitats - Natural Resources Wales

Natural Resources Wales (NRW) is starting the new year by celebrating the completion of several river projects aiming to improve fish habitats and bring a boost to their populations.

The projects were carried out across Wales and focus on repairing damaged assets and improving natural river structures.

Ogwen fish pass after completion (Natural Resources Wales)
Ogwen fish pass after completion (Natural Resources Wales)

One project was carried out on the Ogwen bank weir, Snowdonia, and focused on improving and repairing a fish pass.

The fish pass, which was built in the 1930’s, had been deteriorating over recent years. NRW repaired and modified the asset allowing more fish to access the upstream habitat.

NRW have also improved fish migration on the Nant Clwyd. A weir which controlled water levels had been partially damaged, making it more difficult for fish to get upstream. This meant that no salmon had been recorded in the upstream electro-fishing site since 2009. A boulder barrage was installed to replace the lower weir, raising water levels and making the river much more accessible to fish traveling upstream.

As well as improving the channels that fish can travel through, some projects focused on improving fish spawning sites.

Work on the Afon Wen, a tributary of the river Mawddach, included reinstalling spawning beds that had been washed away by a flooding event in 2001 and damaged by historic gold panning.

NRW reinstated 12 gravel traps that act as spawning sites for fish and within 2 weeks sea trout were sighted spawning in the area.

Traps like these will help boost the local trout population, as they have done in several other sites in Wales in recent years.

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