Figure 3:

(a) Relative lateralization index of fish after 50 days of treatment. The values of L_r are shown for control fish exposed to 442 μatm CO₂ before (I) and after (II) being kept in seawater containing gabazine (4 mg l⁻¹) for 30 min (n = 11) and for fish exposed to 992 μatm CO₂ before (III) and after (IV) being kept in seawater containing gabazine (4 mg l⁻¹) for 30 min (n = 12). (b) The absolute lateralization index after 50 days of treatment in high CO₂ was fully restored by GABA_A-receptor antagonist treatment. The treatments had a significant effect (two-way ANOVA, P = 0.0269). *P < 0.05.