The sampler measured the total lengths of all individual flounder landed unless the quantity of flounder was extremely large, when the total lengths of all released flounder and of randomly sampled wild flounder were measured. When each individual total length could not be measured, the numbers of wild flounder were counted and the percentage measured was calculated. For each flounder with a tag, the release year was determined by means of a combination of tag type (latex or brand tag) and position (on the basal part of caudal fin or dorsal fin), and was recorded along with the total length measurement.