What to Look For

Aquatic Invasive Species (AIS) are species that enter into new ecosystems and spread, causing damage to native species and their habitants. These species are spread beyond their normal distribution, often as a result of human activities, and can threaten valuable environmental, agricultural or personal resources by the damage they cause.
Clubbed Tunicate (Styela clava)
Origin:
Styela clava, originated in the Western Pacific and is considered one of the most damaging invasive species worldwide. It has been found in the Gulf of St. Lawrence in Prince Edward Island since 1997.
Characteristics:
Firm body wrinkled and bumpy, shaped like a water filled wineskin
Brown in colour
Can reach lengths of 18 cm, the stalk accounting for 1/3 of length
Solitary, but may grow in very dense clumps
Impacts:
May out-compete other organisms for food and space, altering natural community dynamics
Threaten aquaculture, fishing and other coastal and offshore activities  Increase the weight of aquaculture cultivation equipment, making work more demanding
Increase operating costs for shellfish producers and processors