Prof Schuster and his PhD student Peggy Gerullis found no evidence for pressure adjustments, nor for chemical additives or flicking movements in the water, which might account for the fishes’ ability to control the stability of the water jet, and focus the accelerating blob at its tip.
For the study, Schuster and co-author Peggy Gerullis trained the relatively big-brained fish to hit targets ranging in height from approximately 8 to 24 inches from a fixed position.