Table 1.

Plasma osmolality and ion composition of fish acclimated for 8 weeks to water temperatures of 15, 22 and 29°C

Water temperature
15°C22°C29°CSignificance test (water temperatures)P
Plasma osmolality (mosmol kg-1)289±2.3264±1.3278±2.622 vs 29<0.01
22 vs 15<0.001
15 vs 29<0.05
Plasma ions (mmol 1-1)
Na+149.2±1.9132.4±3.2143.7±2.822 vs 29<0.01
22 vs 15<0.001
15 vs 29<0.05
Cl-147.7±1.7111.5±3.3131.2±3.722 vs 29<0.01
22 vs 15<0.001
15 vs 29<0.01
K+3.87±0.143.45±0.154.54±0.1922 vs 29<0.001
22 vs 15<0.01
15 vs 29<0.01
Total Ca2+1.99±0.071.99±0.061.85±0.09n.s.
Free Ca2+0.87±0.040.87±0.050.87±0.06n.s.
Values are means ± s.e.m., N=8.
n.s., not significant.