title: Isosmotic points and their ecological significance for juvenile Chinese sturgeon Acipenser sinensis.
abstract: Serum osmolality and ion concentrations were measured in juvenile Chinese sturgeon Acipenser sinensis at different salinities to determine the isosmotic point. Isosmotic and isoionic concentrations were calculated from the regressions for serum and ambient osmolality, with Na(+) , Cl(-) and K(+) as salinities 9·19, 8·17, 7·89 and 9·70, respectively. These values were consistent with the salinity of the habitat where juvenile A. sinensis occur in the Yangtze Estuary, suggesting that an isosmotic salinity is an important factor driving their habitat choice.
authors.affiliation: Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation and utilization, Ministry of Agriculture, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai, 200090, China.
authors.forename: F
authors.initials: F
authors.lastname: Zhao
authors.forename: P
authors.initials: P
authors.lastname: Zhuang
authors.forename: T
authors.initials: T
authors.lastname: Zhang
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: J
authors.initials: J
authors.lastname: Hou
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: L
authors.initials: L
authors.lastname: Zhang
mesh_terms: D000818:Animals; D002681:China; D017753:Ecosystem; D063366:Estuaries; D005399:Fishes / Q000502:physiology*; D064587:Osmoregulation; D054712:Salinity; D044967:Serum / Q000737:chemistry*
keywords: Acipenseridae; Yangtze Estuary; brackish water; habitat; isoionic; osmoregulation