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Osmotic and volaemic effects on drinking rate in elasmobranch fish

W. Gary Anderson^1,*, Y. Takei² and N. Hazon^1,2

¹ School of Biology, Gatty Marine Laboratory, University of St Andrews, St Andrews, Fife KY16 8LB, Scotland
² Ocean Research Institute, University of Tokyo, Tokyo 1648639, Japan

View larger version (16K): [in a new window]   Fig. 1. Basal drinking rates (ml h-1 kg-1) of two species of elasmobranch fish acclimated to 80% sea water (SW) and maximal responses during acclimation to 100% SW. The filled columns represent drinking rates for Scyliorhinus canicula and the open columns represent drinking rates for Triakis scyllia. Results are expressed as means + S.E.M. (N6 for each group). Column B was significantly greater than column A; and columns E and F were significantly greater than column D (*P<0.05, **P<0.01) (Student's t-test).

View larger version (17K): [in a new window]   Fig. 2. Plasma concentrations (mmol l-1) of Na+ (), Cl- () and urea ([UNK]) during acclimation from 80% to 100% sea water in Scyliorhinus canicula. Statistical comparisons were made with time zero (*P<0.05, **P<0.01, ***P<0.001) (Student's t-test). Plasma urea concentration did not change significantly during the acclimation period. Results are expressed as means ± S.E.M. (N6 for each group).

View larger version (21K): [in a new window]   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).

View larger version (27K): [in a new window]   Fig. 4. Plasma concentrations (mmol l-1) of Cl-, Na+ and urea in Scyliorhinus canicula at 0h (black columns), 0.5h (light grey columns) and 3h (dark grey columns) 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. Plasma sodium concentration was significantly (**P<0.01) reduced relative to the 0h value 30min after administration of 75% sucrose (Student's t-test).

View larger version (15K): [in a new window]   Fig. 5. Drinking rate (ml h-1 kg-1) in Scyliorhinus canicula following controlled haemorrhage of approximately 5.7% of total blood volume (N=6). Results are expressed as means ± S.E.M. Drinking rate was significantly (*P<0.05) increased above the basal level for up to 40 min post-haemorrhage (Student's t-test).

View larger version (14K): [in a new window]   Fig. 6. Plasma concentrations (mmol l-1) of Na+ (), Cl- () and urea ([UNK]) following controlled haemorrhage of approximately 5.7% of total blood volume in Scyliorhinus canicula (N=6). Results are expressed as means + S.E.M. Statistical comparisons were made with time zero. Plasma, Na+, Cl- and urea concentrations did not change significantly (Student's t-test).

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