Oysters are transplanted onto constructed reefs to act as "breeders" or broodstock in the restoration effort. These breeders are transplanted with the expectation that they will reproduce and increase the number of oyster larvae in the water column and enhance potential oyster recruitment onto the reef and in the habitat at large. It is important (1) that these breeders survive in the face of disease and (2) that these females are able to produce substantial quantities of viable eggs. To address the first issue, selectively bred disease tolerant oysters are used as breeders because they display heightened survival relative to non-selected stocks and because they can pass disease tolerance on to their offspring. Fecundity, the number of eggs produced per female within a spawning season, is quantified for transplanted oysters to identify their breeding potential. The average number of eggs per female of a given size is combined with data on oyster density, population demographics, and sex ratio from that site to estimate the number of oyster eggs produced per square meter of reef. Fecundity estimates will eventually be compared with concurrently collected estimates of oyster larval (veliger) and recruit abundance from the same river to evaluate the effects of reef stocking with disease tolerant oysters.