According to the Quandamooka Yoolooburrabee Aboriginal Corporation deadly jellyfish have been spotted in shallow waters around North Stradbroke Island. The team, which manages the land and waters in the area, has described the Morbakka fenneri jellyfish as similar to Irukandji. Its sting is severe and can be fatal. Symptoms of the sting can be nausea, vomiting, breathing difficulties, heavy sweating, severe cramps and spasms and severe lower back pain. They can take up to 30 minutes to occur. You should see a doctor immediately if you think you have been stung.