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Figure 2


Fig. 2. Time to peak gape (TTPG) versus fluid speed for both bluegill sunfish (black circles) and largemouth bass (red triangles) using fluids speeds calculated in the earthbound frame of reference (A) and the fish's frame of reference (B). The curve in A is fit to the bluegill sunfish data to show how largemouth bass exhibit a similar relationship. For both species, fluid speed (measured at 1/2 peak gape in front of the fish on the center line) increases with a decrease in TTPG. Note that the variation in fluid speed for a given TTPG is higher for bass than bluegill in both A and B. Also note that the variation in fluid speed for a given TTPG is much greater when accounting for the ram speed of the fish (B). The data for bluegill are from Day et al. (Day et al., 2005).