... as well as maximal activities of enzymes of intermediary metabolism in tissues from marine and freshwater elasmobranchs,including: the river stingray Potamotrygon motoro (<1 mmol l –1 plasma urea); the marine stingray Taeniura lymma , and the marine shark Chiloscyllium punctatum (>300 mmol l –1...

... the South American freshwater stingray Potamotrygon motoro, H. signifer has a functional ornithine-urea cycle (OUC) in the liver, with hepatic carbamoylphosphate synthetase III (CPS III) and glutamine synthetase (GS) activities lower than those of the marine blue-spotted fan tail ray Taeniura lymma . More...

... patterns of pectoral fin muscles driving the locomotor system in the blue-spot stingray Taeniura lymma . Our goals in this study were to determine overall patterns of fin motion and motor control during undulatory locomotion, to discover how these patterns change with swimming velocity and to correlate...