Fig. 7. Carbonic anhydrase activity (µmol CO₂ mg protein^–1 min^–1) in anterior (G4, black bars) and posterior (G8, gray bars) of green crabs acclimated to 32 p.p.t. and transferred to 10 p.p.t. for 4 days. 32, 32 p.p.t. acclimated controls; 10-4days, intact crabs assayed after 4 days at 10 p.p.t.; 10-4daysESA, eyestalk ablated crabs assayed after 4 days at 10 p.p.t.. Values are means ± s.e.m. (N=6). T=12°C. Different letters indicate statistical differences in G8 at P<0.05 across treatments.