Shellfish collected from the southern Bay of Islands have tested positive for the toxin Paralytic Shellfish Toxin.
Early symptoms of paralytic shellfish poisoning are tingling around the mouth and tongue, vomiting and diarrhea. This can progress to weakness and paralysis of the body.
People are warned not to collect or eat shellfish from the area south of Motorua Island to Cape Brett in the Bay of Islands, New Zealand.
If someone has symptoms take them to a doctor immediately.