Abstract
Previously it has been assumed that medusae make random contact with their prey. Medusae were tested in a flow-through aquarium with inflow at each end and a central outflow. Aurelia aurita and Aequorea victoria were attracted to either end of the chamber if Artemia prey were present in a screened compartment. A. aurita was also shown to be attracted to water conditioned by Artemia, and to ammonium chloride added to one or other of the inflow currents.
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