Fig. 4. Time course of changes in liver enzyme activities (glycogen phosphorylase, GPase; 6-phosphofructo 1-kinase, PFK; glucose 6-phosphate dehydrogenase, G6PDH; and glucose 6-phosphatase, G6Pase) in gilthead sea bream acclimated to hyperosmotic (A) or hypo-osmotic (B) conditions. Fish were transferred for 14 days from seawater (SW) to (A) hypersaline water (HSW; closed circles) or (B) low salinity water (LSW; closed circles). Further details as in legend of Fig. 1. Note the different y-axis scales in A and B.