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Fig. 6. The effect of the nitric oxide generator DEANO (106 mol
l1) on clearance. Data are ratios of the treatment rate
(rate of clearance after a 15 min exposure to DEANO) to the unstimulated basal
rate. Data are means ± s.e.m. Treatments: none, untreated controls
(N=39); DEANO (w), gills exposed to DEANO during the winter
(N=17); DEANO (s), gills exposed to DEANO during the summer
(N=18). The mean during the winter is significantly greater than the
untreated controls (P<0.05).