Bull Kelp
Durvillaea potatorum & Durvillaea amatheiae (Bull Kelp)
2011 Bull Kelp Status
| Status | Sustainable |
| Summary | The King Island Bull Kelp Fishery is the main fishery for Bull Kelp in Tasmania. This fishery was deemed sustainable in a 2011 assessment by the Australian Government. Restrictions informing this assessment include harvesting only 50% of beach-cast kelp at each site, harvesting only from specific areas, and a prohibition on sandy beach harvesting during vulnerable hooded plover nesting months. Fishery practices have apparently remained largely unchanged since this assessment. The Bull Kelp Fishery operating on the west coast of mainland Tasmania (Granville Harbour and the Marrawah region) has not been assessed. |
| Stock | Tasmanian Bull Kelp |
| Indicator(s) | Harvest weight (dry tonnage); ecological impacts; TEPS interactions. |
Bull Kelp is the common name for cold water macroalgae species of the genus Durvillaea. In Tasmania, two species (Durvillaea potatorum and Durvillaea amatheiae) co-occur except around King Island, where only D. potatorum is found (Weber et al. 2017). All Durvillaea species require rocky substrate for attachment and wave-exposed environments, generally inhabiting shallow subtidal and intertidal zones (Velásquez et al. 2020).
Beach-cast Bull Kelp is harvested by the Tasmanian Marine Plant Fishery, mostly from the west coast – from Granville Harbour, the Northwest area, and King Island (Wild Fisheries Management Branch 2024). Harvesting is conducted by hand collection, sometimes with winch assistance or with a mechanical harvester and mechanical grab (Velásquez et al. 2020). Thalli are initially air-dried then can be further dried to enable milling into granular form or liquified into fertilizer (Velásquez et al. 2020). Tasmanian Bull Kelp is used in a range of products including cosmetic, pharmaceuticals, fertilizers, food and clothing.
Assessment of the Tasmanian Marine Plant Fishery by the Australian Government’s Department of Climate Change, Energy, the Environment and Water is available here:
Learn more about what each stock status classification means on our Stock Status Classifications Information Page:
Social and Economic Indicators