The present work reports behavioural responses by young-of-the-year (21-30 cm) Atlantic sturgeon Acipenser oxyrinchus oxyrinchus and shortnose sturgeon Acipenser brevirostrum to nine binary combinations of dissolved oxygen saturation (40, 70 and 100%), temperature (12, 20 and 28°C) and salinity (1, 8 and 15). Both species showed no acclimation effects and similar discrimination and avoidance re...

Histological examination of thymi from juvenile Acipenser ruthenus and Acipenser brevirostrum after haematoxylin and eosin staining revealed the presence of Hassall’s corpuscles, in a scattered distribution within the thymic medulla in two of seven, and one of nine examined specimens, respectively. Morphologically, the Hassall’s corpuscles were of the juvenile and premature type and no degenera...

Worldwide, sturgeons (Acipenseridae) are among the most endangered fishes due to habitat degradation, overfishing, and inherent life history characteristics (long life span, late maturation, and infrequent spawning). As most sturgeons are anadromous, a considerable portion of their life history occurs in estuarine and marine environments where they may encounter unique threats (e.g., intercepti...

a NASA Ames Research Center, Moffett Field, CA 94035, USA, (stephen.e.dunagan, roy.r.johnson, philip.b.russell)@nasa.gov Pacific Northwest National Laboratory, Richland, WA 99325, USA, (beat.schmid, connor.flynn)@pnl.gov BAERI, 560 Third St. W., Sonoma, CA 95476, USA, (jhony.r.zavaleta, ryan.walker, Cecilia.S.Chang, jens.redemann-1)@nasa.gov SRI International, 333 Ravenswood Avenue, Menlo Park,...