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Table 3.

Antioxidant enzyme activities and lipid-peroxidation levels in liver and heart of the sturgeon Acipenser naccarii during acclimation to seawater (35‰) and after a period of 20 days at this salinity

Salinity (‰)
1522293535*
Liver      
CAT (U mg protein-1487.8±44.7a 324.2±12.5b 302.8±13.9b,c 318.8±17.7b 235.6±21.6c 
GPX (U mg protein-130.0±4.0 30.0±4.0 20.0±3.0 30.0±4.0 22.0±2.0 
SOD (U mg protein-112.7±0.8a 9.8±0.4b 9.3±0.9b 10.2±0.9b 7.0±0.1c 
MDA (nmol ml-12.1±0.2 1.2±0.2 1.3±0.2 1.4±0.1 1.4±0.2 
Heart      
CAT (U mg protein-111.6±0.5 11.2±0.6 9.2±0.2 9.1±0.9 12.8±1.6 
GPX (U mg protein-17.8±0.8 7.2±0.8 8.0±0.1 6.0±0.6 7.0±0.3 
SOD (U mg protein-111.1±0.5 9.6±0.8 9.5±0.8 8.5±0.5 10.2±0.7 
MDA (nmol ml-11.0±0.2 0.9±0.2 0.6±0.2 0.4±0.1 1.2±0.2 
Salinity (‰)
1522293535*
Liver      
CAT (U mg protein-1487.8±44.7a 324.2±12.5b 302.8±13.9b,c 318.8±17.7b 235.6±21.6c 
GPX (U mg protein-130.0±4.0 30.0±4.0 20.0±3.0 30.0±4.0 22.0±2.0 
SOD (U mg protein-112.7±0.8a 9.8±0.4b 9.3±0.9b 10.2±0.9b 7.0±0.1c 
MDA (nmol ml-12.1±0.2 1.2±0.2 1.3±0.2 1.4±0.1 1.4±0.2 
Heart      
CAT (U mg protein-111.6±0.5 11.2±0.6 9.2±0.2 9.1±0.9 12.8±1.6 
GPX (U mg protein-17.8±0.8 7.2±0.8 8.0±0.1 6.0±0.6 7.0±0.3 
SOD (U mg protein-111.1±0.5 9.6±0.8 9.5±0.8 8.5±0.5 10.2±0.7 
MDA (nmol ml-11.0±0.2 0.9±0.2 0.6±0.2 0.4±0.1 1.2±0.2 

Values are means ± S.E.M. Values with different superscript letters within each row are significantly different (analysis of variance, P<0.05, N=5 fish at each salinity).

Catalase (CAT) activity, 1 unit (U) = 1 mmol min-1; glutathione peroxidase (GPX) activity, 1 unit = 1 nmol min-1; superoxide dismutase (SOD) activity, 1 unit = 50% inhibition of cytochrome creduction min-1; lipid peroxidation levels are expressed as malondialdehyde (MDA) concentration (nmol MDA ml-1).

*

After a period of 20 days at 35‰.

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