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FAQs
Frequently Asked Questions (FAQs)
About Oyster Habitat Restoration and Enhancement
Q - Why do oysters need restoration and enhancement?
A
- Oyster larvae must attach to a hard substrate, ideally another oyster
shell. As adult oysters are harvested, shell (representing available
substrate) is removed from the system. If this shell is not replaced,
habitat is lost. Other contributing factors are the impact of
boat wakes, which can severely damage oyster beds, especially in
smaller creeks, and excessive silt loads resulting from high land
development.
Q - What methods are used to restore and enhance oyster habitat?
A
- The primary method we use is to plant recycled oyster shell at
suitable sites. Plastic mesh bags, much like onion bags, are used to
retain the shell and prevent it from washing away. Over time, as
oysters and mussels recruit to the shell, the bag becomes integrated
into the reef.
Q - What makes a site suitable for restoration or enhancement?
A
- Oysters prefer intertidal locations with high salinity. Thus most
sites will be in tidal creeks. The proposed site should have a
relatively firm substrate (shell is best) to facilitate working on the
reef and to prevent the shell bags from sinking too rapidly. Shell is
easier to stabilize on banks that have a gentle slope than on steep
banks. The presence of oysters in the vicinity indicates potential for
success. Since one of our goals is to reduce shoreline erosion and
protect Spartina marsh grass, many sites will be located adjacent to
salt marshes. Finally, accessibility by volunteers is important,
so most sites are located adjacent to public access points such as boat
landings or parks. SCORE does not normally construct reefs on
private land.
Q - When do you restore oyster habitats?
A
- Adult oysters spawn (and therefore larvae settle) in the summer
months. Shell should be planted from late May through late August for
the best "catch." Shell that is planted outside that window will
accumulate considerable fouling (e.g. barnacles, algae) before oyster
larvae are available to settle. Larvae are less likely to settle
on heavily fouled shells.
Q - Where do you get the shell needed for planting?
A
- Oyster shell recycling is an important component of the SCORE
program. Most restaurants and resorts and many caterers throw
oyster shell in the garbage; others use it for driveway fill.
This shell is a valuable resource that needs to be returned to the
water to provide substrate for juvenile oysters. Currently less
than 10% of the oysters harvested in SC are returned to SCDNR for use
in habitat restoration.
Q - How can I help?
A
- There are many volunteer opportunities. Volunteers are needed to
recycle shell, fill shell bags, build reefs, monitor water quality, and
assist with reef sampling. Sign up to be placed on our mailing
list and notified of workshops, workdays, and volunteer opportunities
by filling out a volunteer form.