MethodsWe performed anesthetization experiments on five marine fishspecies acquired from laboratory-maintained stocks or the wild.Because this study has direct relevance to field studies, where thetargeted individuals are within a size range that commercial orrecreational fishers are allowed to catch, we focused our efforts onevaluating whether carbon dioxide was an effective anesthetic forfour harvestable fishes: red drum (Sciaenops ocellatus), southernflounder (Paralichthys lethostigma), common snook (Centropomusundecimalis), and Florida pompano (Trachinotus carolinus). Wealso tested larval red drum and young-of-the-year inland silver-sides (Menidia beryllina) to extend our results to smaller bodysizes.