Seagrass & Shellfish in Port River

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Coming back: Seagrass and Shellfish in Port River Science in the Sanctuary 11th November 2019 Living Shoreline – Port River Drawings: Peri Coleman 2015 Seagrass Seagrasses are a flowering plant species Not to be confused with seaweed, which do not form flowers, fruits, and seeds to reproduce When there is abundant light, especially in summer, seagrass photosynthesis is high, and the plant will store energy What seagrass does for us? • Nursery grounds for fish • Carbon sinks – ‘Blue Carbon’ with mangroves, samphire and shellfish reefs • Keep water clear – trap sediments and take up nutrients • Help stabile shorelines Seagrass in Port River - Zostera Zostera in Port River August 2018; photo by Kym Murphy Seagrass in Port River - Zostera Zostera in Port River August 2018; photos by Kym Murphy Zostera muelleri • Southern hemisphere temperate species • Commonly referred to as eelgrass or garweed • Fast growing and readily colonising species • Feeding ground for wading birds and aquatic animals • Breeding ground for juvenile fish and shrimp species Port River and Barker Inlet Estuary Natural Restoration in Port River • 2010 Zostera only just south of Torrens Island Quarantine Station (Dr Tanner, SARDI) • Jan 2014 – closure of Penrice • Jan 2017 some Zostera as far south as AGL power station Three ECF projects • Seagrass monitoring in Port River • Seagrass monitoring with AusOcean rigs • Seagrass restoration trial at Snowden’s north Seagrass monitoring https://seagrassspotter.org/user/Pappster International profile https://seagrassspotter.org/map Seagrass Restoration Trial Seagrass Restoration Trial Seagrass Restoration Trial Snowden’s north Seagrass Restoration Trial Photo by Emma Daly 26.10.18 Seagrass Restoration Trial Seagrass translocation 26.10.18 Human impacts Bags moved, April 2019 and broken post, Oct 2019 Shellfish: abundant in Port River Many feral species including Pacific oysters Native oysters • Ostrea angasi or flat oysters • Adult oysters filter a bathtub of water/day • Shellfish reefs provide habitat for other species and food for other organisms • Only one natural reef remains (Tas) • Major reef restoration projects around Australia, including Windara in SA 2017 Returning native oysters 2018 Native oyster trial Trial native oyster reef .

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