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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
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
. Bars with like characters are
not significantly different (ANOVA; P<0.05). Asterisks indicate a
significant difference from the ammocoetes at a given salinity.