Restorative Aquaculture

Restorative aquaculture is a nature-positive approach to seafood production that actively improves the health of aquatic ecosystems. It’s the marine equivalent of regenerative agriculture - farming that gives back to the environment.

By cultivating species like oysters, mussels, and seaweed, restorative aquaculture can deliver measurable ecological benefits while producing nutritious food and supporting local livelihoods. 

Oysters are environmental powerhouses. Some of their key benefits include:

• Water Quality Improvement: Oysters filter large volumes of water (up to 190 litres/day), removing nitrogen, phosphorus, and suspended solids. This helps reduce eutrophication and improves water clarity, benefiting habitats like seagrass beds.
• Habitat Provision: Oyster farms create three-dimensional structures that offer shelter and food for fish and invertebrates, enhancing biodiversity and functioning as nursery grounds.
• Climate Support: While oysters are not major carbon sinks, their role in improving water clarity can support blue carbon habitats like seagrass, indirectly aiding carbon sequestration.
• Resilience & Recovery: Oyster aquaculture can help restore degraded ecosystems and enhance the resilience of healthy ones, especially when farms are well-sited and managed.
• Socioeconomic Value: Beyond ecological gains, restorative oyster farming can support livelihoods, cultural practices, and local economies.

Follow this link for more information on restorative aquaculture. 

Environmental Benefits of Restorative Aquaculture. Figures in USD. From 'Global Principles of Restorative Aquaculture' (The Nature Conservancy 2021)

Underwater Abundance. From 'Global Principles of Restorative Aquaculture' (The Nature Conservancy 2021)

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Carbon Footprint

Carbon neutrality continues to gain momentum in seafood markets and investment circles. While oyster farming has long been recognised as a low-emissions food source, a comprehensive sector-wide audit in early 2025 finally put numbers to the claim.

Led by NSW Farmers Association, the audit assessed 25 oyster farms across New South Wales. The findings were then extrapolated to estimate statewide emissions.

Key findings: ​

• Total industry emissions = 2,640 t CO2e.
• Carbon intensity = 0.93 kg CO2e / kg oysters harvested.
• Carbon intensity = 3.75 kg CO2e / 100g protein.
• Cost to offset ~$100k industry wide, or 1.5 cents / dz (when offsetting with Australian Carbon Credit Units at $34 / tonne CO2e).
  

Carbon emissions per 100g of protein across common farmed foods.

Follow this link for more information on the NSW oyster industry carbon footprint assessment. 

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Canaries of the Waterway

Oysters are considered the canary of the waterway, an excellent indicator of estuary health. Oyster farmers are often the first people to become aware of water quality problems and are often proactive environmentalists. They also self-fund a water quality testing program, contributing valuable scientific data to help monitor the health of the local waterways. 

The activities of the NSW oyster industry are guided by the Oyster Industry Sustainable Aquaculture Strategy (OISAS). This strategy formalises industry's commitment to environmental sustainable practices and a duty of care for the environment in which the industry operates. Beyond this strategy, many oyster-producing estuaries in NSW have also proactively, and voluntarily, developed Environmental Management Systems (EMS). ​

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Environmental Management Systems (EMS)

​Oyster farmers require healthy estuaries and clean water to produce quality oysters, and they work hard with government agencies and partners to protect these coastal resources for future generations. South coast oyster farmers in all major farming estuaries have made a commitment to the environmentally sustainable production of oysters and to the ongoing protection of the estuary. 

This commitment is outlined in an Environmental Management System, or EMS. The EMS is a voluntary initiative that highlights improvements that oyster farmers can make to their own operations, as well as how they can drive environmental improvements within the catchment. More background information on EMS can be found here.