Two oyster shells with holes from boring sponge attacks. The shell on the right has blister marks from the mud blister worm. These came from an adult oyster in the Harris Creek sanctuary in the Choptank River. Photo by Zofia Anchondo.
Two oyster shells with holes from boring sponge attacks. The shell on the right has blister marks from the mud blister worm. These came from an adult oyster in the Harris Creek sanctuary in the Choptank River. Photo by Zofia Anchondo.

Fat mollusks, rockfish and even parasites can be found thriving at oyster sanctuaries in three Chesapeake Bay tributaries, leading scientists to believe that current oyster restoration techniques are working.

Those findings are detailed in a newly released study from the Smithsonian Environmental Research Center and University of North Carolina at Chapel Hill which found more wildlife diversity at sanctuaries than nearby unprotected harvest sites.

One indication of that — two native parasites: the boring sponge and mud blister worm.

They win their names easily enough. The boring sponge drills or “bores” through the shell to make a home while the mud blister worm burrows into the inner shell causing the oyster to form darkened, muddy-looking patches around the worm in self-defense.

Read more (and listen) at WYPR.