Fig. 2. Arrhenius plot of the specific branchial Na⁺/K⁺-ATPase activity (V_spec) of carp acclimated to water temperatures of 15, 22 or 29°C. Q₁₀-values are indicated in the graph. Breaks in the plot occur at 29°C in the 15°C-acclimated fish and at 22°C in the plot of the 22°C-acclimated fish. No apparent break in the plot of the 29°C fish is observed over the range of the temperatures tested. Values are means ± S.E.M.