Fig. 11. The relative size of brains and brain regions is not a direct indicator of energy consumption. (A) The average brain mass of elasmobranch fishes (E, blue) weighing between 175 and 1250 g and teleost fishes (T, red) weighing between 222 and 1170 g. (B) The specific activity of the Na⁺/K⁺ ATPase (µmol min^–1 g^–1). (C) The total brain Na⁺/K⁺ ATPase activity (µmol min^–1). Data from Nilsson et al. (Nilsson et al., 2000).