Genetic diversity in the eastern oyster (Crassostrea virginica) from Massachusetts using the RAPD technique

The random amplified polymorphic DNA (RAPD) technique was used to examine t he genetic variability in eastern oysters (Crassostrea virginica) from four wild-naturalized stocks (Wellfleet, Wareham River, East Wareham/Onset and Barnstable Harbor) and one cultured stock (Cotuit) in Massachusetts. Initia lly, 20 oligonucleotide primers (Kits A, B, C, G, M, and Z; Operon Technolo gies Inc., Alameda, California) were screened and 10 were selected to ampli fy DNA from 79 samples representing these five sites. A total of 90 DNA ban ds ranging in size from 205 to 1,400 base pairs (bp) were scored. The highe st level of polymorphisms were detected in samples from Barnstable Harbor ( 74%) followed by Wellfleet (71%), Wareham River (70%), East Wareham/Onset ( 62%), and Cotuit (54%). There were significant differences in polymorphisms between three wild-naturalized (Barnstable Harbor, Wellfleet, and Wareham River) and cultured samples. East Wareham/Onset samples did not show signif icant differences with the cultured population. Potential site-specific RAP D markers were identified with primers OPA10, OPA17, OPC10, OPG06, and OPM1 8. The frequency of these site-specific RAPD markers varied among the sampl e collection sites. In addition, four unique alleles (OPA17-900 and 875 bp; OPC10-450 bp, and OPG06-270 bp) were identified in samples from Barnstable Harbor, Wareham River, and East Wareham/Onset. Our data provide baseline i nformation on the genetic variation in cultured and wild oyster stocks in M assachusetts and may be useful for future management of the resource.