Impact of abrupt salinity changes on activitiy of metabolic enzymes, antioxidant enzymes and cortisol content in serum and liver of <italic>Lateolabrax maculatus</italic>

Lateolabrax maculatus is an important economic fish species in China. It a eurysaline and can survive grow water environment with varieties of salinity. practical significance to study the tolerance adaptability L. maculatus, because it usually suffers from sudden increase or decrease salinity aquaculture environment. This work investigated effects abrupt changes on activitiy metabolic enzymes antioxidant cortisol content liver maculatus by simulating for its breeding. The was reduced 18 0 remained 7 d, then increased 33 sharply after acclimation d. Correspondingly, other treatment, 33, decreased Samples were taken 0, 0.5, 1, 3,7 d start experiment, respectively. alkaline phosphatase, acid glutamic-pyruvic transaminase, glutamic-oxalacetic superoxide dismutase, catalase, glutathione peroxidase serum L.maculatus tested, (COR) monitored as well. Results showed that would have impact enzymes, COR L.maculatus. trend increasing firstly declining time prolonging under most situations changes. These results had stress reaction during changing salinity, could adapt change within 3-7 days, which indicated substantial morphological characteristics, enzyme activity, activity more rapidly drop adaptable low-salinity