01/09/2026
Along with our work trapping European green crab, another key component of our 2025 field season focused on surveying invasive tunicate species along western Newfoundland and the Great Northern Peninsula. The Aquatic Invasive Species (AIS) team at Intervale Associates has been busy conducting presence and absence surveys, which involves deploying “tunicate towers” off of wharves in local harbours. These towers consist of a brick for weight, a temperature data logger (to measure ocean surface temperature over time), and PVC plates (see photo below). If tunicates have invaded that location, they will typically grow on the PVC plates (and many times the brick and rope as well!) on the tower. Thank you to our project funder, Fisheries and Oceans Canada for allowing us to do this work.
Check out the photos below, showing golden star tunicate (𝘉𝘰𝘵𝘳𝘺𝘭𝘭𝘶𝘴 𝘴𝘤𝘩𝘭𝘰𝘴𝘴𝘦𝘳𝘪). This is one of the many invasive biofouling organisms found in Newfoundland’s coastal waters. Golden star tunicate will form dense colonies and dominate both natural and artificial/man-made structures, like rocks, wharves, boats, and aquaculture gear. This species can also displace, suffocate, and outcompete other organisms, such as mussels, scallops, and eelgrass.
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How can you stop invasive biofouling species like golden star tunicate from spreading? Learn about how you can Clean, Drain, Dry, and Decontaminate your boat and equipment to stop these species from hitching a ride: https://www.dfo-mpo.gc.ca/species-especes/ais-eae/prevention/clean-drain-dry-decontaminate-lavez-videz-sechez-decontaminez-eng.html
Have you seen golden star tunicate or any other aquatic invasive species? Contact Fisheries and Oceans Canada to report it: https://www.dfo-mpo.gc.ca/contact/invasive-species-especes-envahissantes-eng.html