Dr Richard Unsworth's research into seagrass meadows has been reported on the BBC news website.
Seagrasses - the underwater plants that act as nursery grounds for young fish - need more protection, say scientists.
Monitoring of seagrass meadows off the North Wales coast found areas damaged by the likes of boat moorings, anchors and vehicles crossing at low tide had reduced value to the ecosystem.
Fewer species of fish were found where seagrass was degraded, according to research published in PeerJ journal.
- Monday 29 June 2015 13.47 BST
- Monday 29 June 2015 13.58 BST
- College of Science