How do most tetraodontiform fishes swim at ordinary speeds?

At ordinary speeds, most tetraodontiform fishes swim using rapid undulations or complex sculling motions of their soft dorsal and anal fins.1

While these fins provide propulsion for normal movement, the powerful caudal fin is typically reserved for rapid bursts of speed, except in the case of the Molidae. Additionally, their pectoral fins remain in a state of near-constant rapid vibration, which allows for a high degree of control and delicacy in their movements.1