A problem to be solved by the present invention is to prevent an aquatic creature from jumping out of a water tank without directly contacting the aquatic creature； and a jump-out prevention device for the aquatic creature, which can solve or reduce the problem, is provided.The jump-out prevention device for the aquatic creature includes electrode parts arranged along an inner perimeter of a water tank for keeping the aquatic creature； and a power supply part electrically connected to the electrode parts, and configured to apply electrical pulses to the electrode parts. The electrode parts extend in a horizontal direction partially or entirely over the inner perimeter of the water tank, and are arranged in a predetermined underwater region in the water tank. The electrical pulses are applied to the electrode parts.
