The southern bull kelp genus Durvillaea is in high demand due to its very high alginate content and as a plant bio-stimulant. However, current supply is limited to harvesting beach-cast material on King Island and the west coast of Tasmania, accentuating the need for an alternative source. This work aims to understand the reproductive biology of Durvillaea in Tasmania with a view to developing hatchery methods to bring it into cultivation. Durvillaea tissues were sampled from three exposed sites along Tasmania’s east coast (Eaglehawk Neck, Bicheno, Binalong Bay) from May to December 2023, and reproductive status determined based on conceptacle maturity from sectioned tissue and gamete release. Reproductive male and female individuals were present throughout the sampling period, with a higher proportion of fertile individuals and higher gamete release occurring in late-winter/early-spring for both sexes. There was little variation across the three sites, although individuals from the northernmost site, Binalong Bay, had the highest gamete output. Future scope of the project includes identifying optimal conditions for effective culture and assessing variation in alginate yield and structure.