Investigations are underway to determine whether a marine pest has been found in Southland

Environment Southland has been notified of the discovery of a possible single Mediterranean fanworm in Bluff Harbour last week.

The 59 centimetre long worm, found under the town wharf, has been sent for formal identification.

The pest forms dense colonies, displacing native species and threatening fisheries.

The public and marine industry are being asked to keep an eye out and report any suspected sightings - as well as ensure their gear and hulls are clean.