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Fig. 5. Whole-body ammonia and urea levels in Rivulus marmoratus following 7 days of exposure to 0 (fresh water), 15 (control) and 45 {per thousand} sea water. Values are expressed as means + S.E.M., N=5 (45 {per thousand} treatment) or N=6 (0 and 15 {per thousand} treatment). Columns labelled with one or more letters that are the same are not significantly different; absence of a letter indicates no significant difference. Columns labelled with no letters in common are significantly different (P<0.05).