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The article discusses a study of migrations, site fidelity and homing ability of brand-marked flounder Platichthys flesus in the Tamar estuary, South West England from 1976 to 1980. An otter trawl or beam trawls were used to capture flounder and the freeze-branding technique was employed to mark the fish. Majority of female flounder caught at T2 and T9 stations toward the end of the spawning season were females. During the summer, five recaptures of marked flounder were from Plymouth Sound. Results show that the ability of the Tamar fish to home within the estuary and Plymouth Sound is better than their ability to locate their spawning grounds.