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Indicators 2.2.8–2.2.10
by Contact on 8 October 2026
Requirement
Indicator applicability: land-based systems The UoC shall have successfully restored a minimum of 50% of natural wetland converted before May 1999.
Indicator applicability: land-based and suspended systems The UoC shall not convert natural wetland after May 1999. An exception applies where conversion is needed for establishing and maintaining pumping stations, water pipes or canals, in which case the UoC shall successfully restore 100% of the converted area.
Indicator applicability: land-based and suspended systems The UoC shall report to ASC the area of the restored wetland, according to ASC data submission procedures.
How Do I Interpret This Requirement?
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Rehabilitation projects should be located within or adjacent to farming activities, to restore ecosystem function close to where it has originally been lost.
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If this is not feasible, the UoC may contribute to regional rehabilitation activities.
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Restoration activities should ensure habitats and biodiversity are equivalent to habitat and biodiversity lost through conversion.
Evidence of Implementation
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Spatial mapping of the converted and restored areas:
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Time series maps showing changes in the cover of natural wetlands.
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Polygons or measurements of the converted and restored areas showing the surface areas of conversion and rehabilitation.
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This evidence shall be submitted to ASC in accordance with Indicator 2.2.10.
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The location of rehabilitation projects. If local rehabilitation efforts were not possible, evidence should be presented demonstrating why they were not possible.
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Auditors Should Confirm
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The appropriate area of natural wetland has been successfully rehabilitated.
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Polygons or measurement of the areas showing conversion and rehabilitation have been presented by the UoC.
Useful Resources
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Best Practice Guidelines for Mangrove Restoration developed by the Global Mangrove Alliance and the Blue Carbon Initiative: Best-Practice-Guidelines-for-Mangrove-Restoration_v4.pdf.
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The guidelines lay out the steps for rehabilitation project design, setting goals and assessing feasibility, project implementation, monitoring, evaluation and adaptive management.
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Spatial mapping tools:
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GIS portal: GIS portal – ASC International (asc-aqua.org)
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Clark Labs Coastal Habitat Mapping: Mangrove and Pond Aquaculture Conversion Coastal Habitat Mapping: Mangrove and Pond Aquaculture Conversion – Clark Labs.
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Global Mangrove Watch country-level information on mangrove habitat extent and change: Global Mangrove Watch.
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Additional rehabilitation tools:
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The Climate-Smart Mangrove Tool (CSMT) is designed to aid conservation practitioners in selecting appropriate “climate-smart” actions to reduce the current and future impacts of climate change on mangrove ecosystems: <https://www.worldwildlife.org/publications/the-climate-smart-mangrove-tool-excel-based-workbook>.
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Where to restore mangrove habitats:
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The Mangrove Restoration Potential Mapping Tool provides information on the ecosystem services provided in restoration of regions within a country <https://maps.coastalresilience.org/mangrove-restoration/>.
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SFP Technical Paper: How coastal shrimp farming can support effective mangrove regeneration: FINAL – Shrimp Farming and Mangroves Technical Paper Dec2022.pdf – Google Drive.
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To help the farmed shrimp industry more effectively identify and protect mangrove habitat, SFP and Longline Environment developed the Aquascape mangrove-shrimp pond mapping tool to show where shrimp farming regions and mangrove habitat overlap in India, Indonesia, Thailand, and Vietnam. Register to use the tool at: Mangrove mapping tool – Sustainable Fisheries Partnership.
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