Fig. 6. (A) Water uptake in B. marinus fully immersed in DI water or NaCl (50 mol l^–1), with or without the seat patch and the skin on the lateral sides covered by a mixture of beeswax and vegetable oil. Each column represents mean ± 1 s.e.m. of 15 trials. Water uptake from both DI and NaCl was significantly reduced when the skin was covered by the hydrophobic mixture. (B) Water uptake from DI or NaCl, with or without the skin on the lateral sides covered by the hydrophobic mixture. Water uptake from DI was not affected, but water uptake from NaCl was significantly reduced when the lateral skin was covered by the hydrophobic mixture. ***P<0.001.