Media playback is unsupported on your device

Cardigan Bay dolphins 'sent north' by noise

20 June 2013 Last updated at 07:37 BST

Speedboats and water bikes using Cardigan Bay may be driving its famous dolphins over 100 miles north to quieter waters, experts have warned.

Bottlenose dolphins usually spend the summer months in the sea off Ceredigion before heading to north Wales and the Isle of Man for winter.

But research suggests they are spending less time in Cardigan Bay and noisy water sports could be partly to blame.

The Sea Watch Foundation has called for better protection for the mammals.

Water sports 'send dolphins north'