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• W2167564908 abstract "Relatively little is known about salinity acclimation in the primitive groups of fishes. To test whether physiological preparative changes occur and to investigate the mechanisms of salinity acclimation, anadromous green sturgeon, Acipenser medirostris (Chondrostei) of three different ages (100, 170, and 533 dph) were acclimated for 7 weeks to three different salinities (<3, 10, and 33 ppt). Gill, kidney, pyloric caeca, and spiral intestine tissues were assayed for Na(+), K(+)-ATPase activity; and gills were analyzed for mitochondria-rich cell (MRC) size, abundance, localization and Na(+), K(+)-ATPase content. Kidneys were analyzed for Na(+), K(+)-ATPase localization and the gastro-intestinal tract (GIT) was assessed for changes in ion and base content. Na(+), K(+)-ATPase activities increased in the gills and decreased in the kidneys with increasing salinity. Gill MRCs increased in size and decreased in relative abundance with fish size/age. Gill MRC Na(+), K(+)-ATPase content (e.g., ion-pumping capacity) was proportional to MRC size, indicating greater abilities to regulate ions with size/age. Developmental/ontogenetic changes were seen in the rapid increases in gill MRC size and lamellar length between 100 and 170 dph. Na(+), K(+)-ATPase activities increased fourfold in the pyloric caeca in 33 ppt, presumably due to increased salt and water absorption as indicated by GIT fluids, solids, and ion concentrations. In contrast to teleosts, a greater proportion of base (HCO(3) (-) and 2CO(3) (2-)) was found in intestinal precipitates than fluids. Green sturgeon osmo- and ionoregulate with similar mechanisms to more-derived teleosts, indicating the importance of these mechanisms during the evolution of fishes, although salinity acclimation may be more dependent on body size." @default.
• W2167564908 created "2016-06-24" @default.
• W2167564908 creator A5022965485 @default.
• W2167564908 creator A5033366166 @default.
• W2167564908 creator A5052162871 @default.
• W2167564908 date "2009-06-11" @default.
• W2167564908 modified "2023-09-28" @default.
• W2167564908 title "Mechanisms of seawater acclimation in a primitive, anadromous fish, the green sturgeon" @default.
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• W2167564908 doi "https://doi.org/10.1007/s00360-009-0372-2" @default.
• W2167564908 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2745624" @default.
• W2167564908 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19517116" @default.
• W2167564908 hasPublicationYear "2009" @default.
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