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Tabulation of α, the intercept values of rectilinear body-scale regressions used in Fraser-Lee calculation of growth from scales, for several species of centrarchids and percids showed wide variation from population to population. This variation is believed to be less the result of actual differences among populations than the result of measuring scales at different angles, collecting scales from different areas of the body, season of collection, and samples with poor representation of all sizes. Use of standard α values for each species would eliminate the variance caused by poor sampling. The following standards are proposed for all studies in which there is question of adequate sampling for body-scale regressions: 10 mm, Lepomis cyanellus; 20 mm, Ambloplites rupestris, L. gulosus, L. macrochirus, Micropterus salmoides; 25 mm, L. gibbosus; 30 mm, Perca flavescens; 35 mm, M. dolomieui, Pomoxis annularis, Pomoxix nigromaculatus; 55 mm, Stizostedion vitreum. Collection of scales for these species from 2 to 5 rows below the lateral line even with the middle of the spinous dorsal fin is recommended.
Kenneth D. Carlander (Sat,) studied this question.