Sustainability of fisheries, especially recreationally and economically important fishes, has been the main focus of fisheries management along the Gulf of Mexico. The estuarine-dependent spotted seatrout, Cynoscion nebulosus, is a popular recreational fish and a bioindicator for estuaries. In Texas the Texas
We used ARLEQUIN 3.1 to analyze genetic variation and its distribution across populations to uncover stock structure. Observed heterozygosity is high (Ho = 0.819) across all loci and all populations. FST, which is a measure of the amount of variation among populations versus within populations, was 0.126 (P = 0.004) indicating significant stock structure. However, an analysis of molecular variation (AMOVA) indicated that most of the variation in our samples (>70%) occurred within individuals within bays. These data indicate that managers should take into account possible differences among bays when setting policies for this fishery.