Bivalves are good candidates for tag and recapture studies because the accrual of shell material provides a stable record of growth. Obtaining measurements for tagged individuals over time relies on the resilience of markings or tagging devices to environmental stress as well as the readability of identifying markings upon capture. Tagging devices should also be easy and quick to apply in order to minimize potential stress to the animal during extirpation from the water. A variety of methods to attach devices to the inside and outside of bivalve shells have been used in tagging studies. This paper describes a low cost, commercially available, self-adhesive numbered tag for application to clams and other bivalves. Tests of the tag demonstrate its resilience to severe conditions over a short time scale with a ninety-five percent recovery of individuals with tags remaining intact. Ninety-four percent recovery of individuals with tags intact was also achieved in long-term studies. No problems with legibility of tags recovered occurred in any of the tests.