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Figure 3


Fig. 3. Branchial residual (ouabain-insensitive) activity (µmol ADP mg–1 protein h–1) in ammocoetes (white bars) and transformers (grey bars) of P. marinus. (A) Ammocoetes and transformers (stages 3–5) acclimated to freshwater (FW) and 25{per thousand} salinity and sampled from the Fort River, MA, USA (hatched bars). (B) Ammocoetes and transformers (stage >=6) acclimated to deionized water (DW), FW or saline water of 10, 20, 30 and 35{per thousand}. Bars with like characters are not significantly different (ANOVA; P<0.05). Asterisks indicate a significant difference from the ammocoetes at a given salinity.