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Fig. 4. Net acid flux (µmol h-1 g-1 fish, N=4) in P. schlosseri exposed to (A) 50% seawater (SW) pH 7.0 or (B) 50%SW pH 8.0, containing various concentrations (10, 20 or 30 mmol l-1) of NH4Cl. Values are means ± S.E.M. aSignificantly different from the corresponding control (pH 7.0) values, P<0.05.