Threat: Habitat alteration
- irregular lobes that can be cylindrical and rope-like, flat, bulbous or branching, and reaching up to 1m long
- translucent, with darkish leaf-like veins with pores
- firm, smooth texture
- white, cream or brown in colour.
- immobile filter feeding, tube-like invertebrates that occur in colonies
- known for overgrowing and swamping other species and for covering fish spawning grounds, aquaculture cages, vessel hulls and other equipment.
- its growth could threaten our fishing and aquaculture industry, and the conservation of native marine habitats
- continued growth could cost mussel farming an estimated £1.3m – £6.8m over next 10 years.