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Fig. 2. Effects of exposure to brackish water (10{per thousand}, control), seawater (30{per thousand}) or air (emersion) for 17 days on ammonia contents in the adductor muscle (white bars), foot muscle (grey bars), hepatopancreas (black bars), mantle (hatched bars) and plasma (dotted bars) of Polymesoda expansa. Values are means ± S.E.M. (N=5). aSignificantly different from the brackish water value (P<0.05); bsignificantly different from the seawater value (P<0.05).