Glebe wetland seafood habitat repair
An unconventional approach avoiding plastics.
Capacity building - LEP23_015_LLC_OWA
The issue
Saltmarsh, mangroves and shellfish reef form very important fish habitats. In Sydney harbour these habitats are limited by urban expansion and pollution so the small pockets that remain are valuable.
Conventional coastal wetland restoration commonly relies on synthetic geotextile materials to stabilise soils and control erosion, embedding plastics directly into sensitive marine environments. Over time, these materials fragment and contribute to microplastic pollution while reinforcing a rigid engineering model that prioritises structural permanence over ecological function.
The solution
A 30-metre biomimicry wetland on the foreshore of Glebe was designed to restore oyster reef and saltmarsh habitat without the use of geotextile plastics, instead using sandstone, sand substrates, and biodegradable hessian and coir fibre for temporary stabilisation. The system is intentionally engineered for gradual reshaping and material breakdown, allowing natural processes to establish equilibrium over time. W Sydney have generously been treating the shell to a standard required for NSW Biosecurity. The shell is being installed by OceanWatch as a means to arrest wave energy to the top bed and as a substrate for oyster recruitment on the lower bed.
The impact
The project demonstrates that functional intertidal habitat can be created while eliminating embedded plastics from restoration design, reducing long-term microplastic load in adjacent waters near the Sydney Fish Market. It challenges conventional coastal engineering assumptions and provides a replicable model for nature-based infrastructure that prioritises ecological productivity over static landscape form.
Learnings
The adaptive design requires ongoing stewardship, including periodic removal of marine debris, supplementary shell placement to support reef development, and targeted plant maintenance to ensure establishment success. While initial capital funding supported construction, securing sustained operational funding for long-term ecological management remains a structural challenge common to on-ground restoration projects.
Community interest in the site has been strong; however, direct public participation is necessarily constrained due to the sensitivity of newly established saltmarsh and intertidal plant communities, which are vulnerable to trampling and disturbance.
Key facts
- This wetland has an unusual tenure meaning that it can be modified more easily than other areas. It was in such poor shape that it had very limited ecological function or visual appeal.
- As of December 2025, 605kg of shell has been collected from W Sydney. 12 months after repair the site is slowly stabilising but will remain sensitive because of its location.
- Diversion from landfill is a circularity theme that drives business participation in projects like this. Landcare connects skills and resources for better environmental outcomes locally.
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