Four Mediterranean fanworms, known as aggressive marine pests, have been found in Gisborne's Harbour.
Divers from the Bay of Plenty scoured the Gisborne harbour last week after Gisborne District Council found one fanworm on the training wall in the port in June last year.
The following month divers were brought in and an extensive search of the inner harbour found no sign of any more worms. A second dive operation was conducted late last year.
A single fanworm was found and the latest search was a follow-up operation.
"Unfortunately the dive team found four more last week," said council shared services science manager Lois Easton.