Growth of homogenous sized groups was studied in captive populations of Senegalese sole (Solea senegalensis, Kaup) juveniles. An initial sole population was graded and three different sole stocks were obtained according to their respective size to form the homogenous sized experimental groups: small, medium and large, with mean weights (±SD) of 125.5 ± 22.3, 187.8 ± 34.0 and 285.9 ± 39.3 g, respectively. A fourth sole population was established from randomly selected juveniles from every stock to constitute the ungraded control subpopulation (mean weight of 155.1 ± 57.8 g). Fish were individually tagged and their specific growth rates (SGR) registered throughout two months. Growth of the three subpopulations originally graded in small, medium and large sized soles, was always similar (P > 0.05) at any time (approximately 0.50% day−1). After 60 days of culture, the SGR of the ungraded group was higher (P > 0.05) than that for the sole groups with more uniform size. Grading soles also affected to SGR distributions, revealing significantly narrower profiles (P < 0.05) from day 20 in graded groups with respect to the one that remained ungraded.