Fig. 4. Haemolymph flow rates (ml min^-1) through the (A) anterior aorta (B) left anterolateral artery (C) right hepatic artery (D) posterior aorta and (E) sternal artery of eight Cancer magister. Crabs were monitored during a 3 h control period in normoxia, food was administered and cardiac parameters followed for a further 1 h in normoxia after which, hypoxic conditions of 3.2 kPa were initiated for 6 h. Normoxic conditions were then restored for an additional 6 h. Values are means ± S.E.M. The beginning of the feeding, hypoxic and normoxic periods are marked. In some cases standard errors were very small and do not show clearly on the figure.