Elsewhere sightings have been reported from Cardigan Island, Mwnt, Ynys Lochtyn, Bird's Rock in New Quay and New Quay harbour off Ceredigion.

BBC: Cardigan Bay dolphin survey marks 10 years

Mr Roberts was due to meet his father near a church in the hamlet of Mwnt on 10 March, but failed to show up.

BBC: Owain Roberts