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In the last few years, there have been many new developments and significantaccomplishments in the research of bionic robot fishes. However, in terms ofswimming performance, existing bionic robot fishes lag far behind fish,prompting researchers to constantly develop innovative designs of variousbionic robot fishes. In this paper, the latest designs of robot fishes arepresented in detail, distinguished by the propulsion mode. New robot fishesmainly include soft robot fishes and rigid-soft coupled robot fishes. Thelatest progress in the study of the swimming mechanism is analyzed on the basisof summarizing the main swimming theories of fish. The current state-of-the-artresearch in the new field of motion coordination and communication of multiplerobot fishes is summarized. The general research trend in robot fishes is toutilize more efficient and robust methods to best mimic real fish whileexhibiting superior swimming performance. The current challenges and potentialfuture research directions are discussed. Various methods are needed to narrowthe gap in swimming performance between robot fishes and fish. This paper is afirst step to bring together roboticists and marine biologists interested inlearning state-of-the-art research on bionic robot fishes.

Designs, Motion Mechanism, Motion Coordination, and Communication of Bionic Robot Fishes: A Survey