Hairy Mussel

Trichomya hirsuta

The hairy mussel is a marine bivalve that can reach a length of about 55 millimetres. Its lower shell is distinctively covered with a dense layer of short hairs, which helps differentiate it from other mussel species. This species is endemic to southern and eastern Australia, found along the coasts of Tasmania and extending as far north as Cairns. It typically inhabits exposed reefs and rocky areas in both intertidal and subtidal zones, where it attaches to hard surfaces using byssus threads. The hairy mussel forms dense beds that provide habitat for various other marine organisms. In terms of feeding, the hairy mussel is a filter feeder, drawing in water to extract plankton and organic matter. Its ability to thrive in low oxygen environments makes it an important species in its ecosystem. The hairy mussel's growth can lead to the blocking of condenser pipes and encrusting of submerged structures. This species is also known for its role as a bioindicator, accumulating pollutants in its tissues, which can reflect the levels of heavy metals in its surrounding environment. Encounters with the hairy mussel during dives may involve observing its dense clusters on rocky substrates, often amidst seaweed. Divers may notice its unique hairy appearance, which adds texture to the underwater landscape.