Barrier reduction boosts fish migration on Afon Terrig

Fish migration has been boosted on Afon Terrig thanks to work to reduce the impact of a man-made structure on the river.

The project, organised and funded by Natural Resources Wales (NRW) fisheries staff saw two pools created downstream of the structure using large boulders.

This helped to raise water levels to below the barrier, reducing the height of the jump fish need to make to pass over it.

The improvement is designed to help migrating fish species, such as salmon and trout, reach their upstream spawning grounds more easily and successfully. By reconnecting the river in this way, the project supports the natural lifecycle of these species and contributes to the overall health of the river ecosystem.

The work is part of ongoing efforts to improve river connectivity across Wales.

Barriers to fish migration can have a significant impact on fish populations, limiting their ability to reproduce and thrive. But removing or easing these barriers is a key step in restoring healthy, resilient rivers.

Rhys Ellis, NRW Environment Team Leader, said: “This project will make a real difference for fish species in the Afon Terrig.

“By creating these pools, we’ve reduced the challenge posed by the man-made structure and given fish a better chance to reach their spawning grounds this season.

“It’s a small but important step in supporting biodiversity and the long-term health of our rivers.”

NRW officers will continue to monitor the site over time to assess the benefits of the work and ensure that fish are able to take advantage of the improved conditions during their migration.