Fig. 4. The effects on ventilation amplitude (percentage change from starting
values) of graded hypoxia, hyperoxic hypercarbia, hyperoxia and injections of
NaCN externally into the respiratory water. The data are shown as the mean +
S.E.M. (N=8-12). In each graph, the different groups are C, control;
GD, gills denervated; GOD, gills and orobranchial cavity denervated; DC,
decerebrate control; DGD, decerebrate, gills denervated; DGOD, decerebrate,
gills and orobranchial cavity denervated. Asterisks indicate values that are
significantly different from resting values for fish within that group under
normoxic normocapnic conditions (100 % value).
