Governor Island

Governor Island Marine Nature Reserve is one of Australia's finest temperate diving destinations, located off Bicheno on Tasmania's east coast. The reserve encompasses more than 35 dive sites featuring extraordinary sponge gardens, sea whips, granite reef formations, and an exceptional diversity of marine life in the clear, cold waters of the Tasman Sea. The reserve is part of a small chain of islands and reefs just offshore from Bicheno township that create a sheltered and accessible diving environment for visiting divers and snorkellers.

Governor Island's marine environment is renowned for its exceptional diversity of temperate marine life. The granite reef formations support extensive communities of soft corals, sea whips, sponge gardens in spectacular colours, and diverse fish species. The endangered weedy sea dragon (Phyllopteryx taeniolatus) inhabits the kelp-fringed shallows, and Australian fur seals are present year-round and commonly interact with divers. The southern rock lobster and abalone communities in the reserve are protected from fishing, allowing them to reach sizes rarely seen in fished areas. Giant cuttlefish, octopus, and diverse nudibranchs add to the dive experience.

The subtidal zone of Governor Island is covered with diverse algal communities including giant kelp, which forms three-dimensional kelp forest habitat in deeper waters. Encrusting coralline algae, filamentous algae, and the diverse communities of invertebrates attached to reef surfaces create the complex reef ecosystem. Giant kelp forests have declined significantly in Tasmanian waters due to warming sea surface temperatures, and the Governor Island area represents one of the remaining significant kelp habitats on the east coast.

Governor Island and the surrounding reefs are composed of Devonian granite, the same rock type that characterises the coastal headlands and islands of northeastern Tasmania. The granite reef formations provide the substrate for the rich invertebrate communities, with the rough texture and varied profile of the granite creating diverse microhabitats. Underwater caves, arches, and swim-throughs in the granite reef add to the dive experience.

Bicheno and the east coast have a relatively dry and warm climate compared to most of Tasmania. The Tasman Sea offshore provides cold, nutrient-rich water that supports the rich marine life of the reserve. Water temperatures range from approximately 11 to 18 degrees Celsius, requiring wetsuits for diving. Easterly swells can create rough surface conditions, and diving conditions are best in the many calm days on the east coast.

The Bicheno coastal area was traditional Oyster Bay tribe (Paredareme) Palawa country, with the coast's marine resources providing important food. European whalers and sealers worked the east coast from the early nineteenth century. Bicheno developed as a fishing port and later as a tourism centre, with diving and marine recreation growing from the mid-twentieth century.

Governor Island Marine Nature Reserve was established to protect the outstanding marine biodiversity of the Bicheno offshore reef system. The marine reserve designation provides protection for marine life from fishing and other extractive activities, allowing the ecosystem to demonstrate what a healthy temperate reef can look like with minimal human extraction.

Diving and snorkelling are the primary activities at Governor Island, with more than 35 dive sites varying in depth, character, and features. Popular sites include the sponge gardens at Big Seagull Island, caves and arches in the granite reef, and the kelp forest habitats in deeper water. Above water, the island and surrounding reefs can be explored by kayak from Bicheno beach. A glass-bottom boat tour operates from Bicheno for non-divers to view the marine reserve.

Governor Island Marine Nature Reserve is accessed from Bicheno, approximately 190 kilometres north of Hobart. A dive operator in Bicheno offers guided dives, equipment hire, and boat charters to the reserve. Bicheno has accommodation, restaurants, and visitor services. The reserve is accessible to recreational divers, snorkellers, and glass-bottom boat tour passengers.

Conservation management of Governor Island focuses on protecting the no-take marine reserve from illegal fishing and ensuring the reef ecosystem recovers its natural structure with large, old fish and invertebrates. Giant kelp restoration trials are being conducted in the Bicheno area as part of a broader effort to address kelp decline driven by warming sea temperatures associated with climate change. Monitoring programs track fish populations, invertebrate communities, and habitat condition over time.