Little Choptank Restoration

Large-scale restoration efforts began in 2014 in Little Choptank sanctuary. The initial implementation phase of the restoration project is projected to be completed in 2019, with a total of 357.8 acres of reef restored. Monitoring is underway to gauge success. 

The restoration plan for Little Choptank may be found here. 


The oyster metrics are quantitative evaluation criteria used to determine the restoration success of an oyster reef and tributary.

  • A successfully restored reef should have:
    • A ‘minimum threshold’ of 15 oysters and 15 grams dry weight per square meter covering at least 30 percent of the target restoration area at six years post restoration;
    • A ‘target’ of 50 oysters and 50 grams dry weight per square meter covering at least 30 percent of the target restoration area at six years post restoration;
    • Two or more oyster year classes present; and
    • Stable or increasing spatial extent, reef height, and shell budget.
  • A successfully restored tributary is one where:
    • 50 to 100 percent of the currently restorable oyster habitat (CROH) has oyster reefs that meet the reef-level metrics above. Restorable habitat is defined as area that, at a minimum, has appropriate bottom quality and water quality for oyster survival AND
    • 8 to 16 percent of historic habitat (Yates Bars), and preferably more, has oyster reefs that meet the reef-level metrics above

 

Three year and six year monitoring efforts are used to assess the oyster metrics for each reef. So far, at three year monitoring (2017) 100% of reefs met the minimum threshold success criteria for oyster density and biomass in Little Choptank. Oyster monitoring reports can be found here:

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Little Choptank Restoration Reefs

Below is an interactive map with the restoration reefs in the Little Choptank sanctuary. The legend and layers are located in the upper right hand corner. You can click on a reef to see more information. The information was last updated in 2018.

Restoration sites are identified as ‘seed only’ restoration (hatchery-produced spat-on-shell added to existing remnant reefs) or ‘substrate + seed’ restoration (adding reef-building substrate to the reef footprint, followed by planting with hatchery-produced spat-on-shell) or ‘premet’ (sites that already meet the Oyster Metrics target oyster density (50+ oysters per m2) and oyster biomass (50+ grams per m2) and did not receive initial restoration).