Fig. 3. Drinking rates (ml h^-1 kg^-1) in Scyliorhinus canicula following administration of 1 ml kg^-1 body mass of (A) 20% NaCl (N=9), (B) 2 mol l^-1 mannitol (N=7), (C) 75% sucrose (N=7) and (D) vehicle (N=4). Results are expressed as means ± S.E.M. Drinking rate was significantly reduced (^**P<0.01) below basal levels 60min post-administration of 20% NaCl (Student's t-test).