The dynamic behavior of small shrimp-like creature is analyzed by a digital high speed video camera system. Test small aquatic creature is opossum shrimp, Archaeomysis kokuboi Ii. Some movement models of opossum shrimps are observed. The details of the motion of swimming legs and flow fields are revealed experimentally. Flow visualization around tethered opossum shrimp is also performed by slow shutter photographic technique.

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The micro magnetic swimming mechanism was produced for trial purposes based on the swimming analysis of copepods in the beginning. The magnetic mechanism composed of a permanent magnet and polyethyleneterephthalate film fin swims by the alternating magnetic field. Frequency characteristics of the swimming mechanism were examined, and surface flow fields induced by the robot propulsion were analyzed by visualization method. The swimming properties of micro magnetic mechanism were revealed experimentally.

This paper is concerned with fluid flow generated by the locomotive organs of some arthropods, such as amphipoda, isopoda, and so on. The swimming and jumping behavior of some arthropods were studied using a highspeed video camera system. Flow field induced by swimming legs of some aquatic creatures were analyzed by visualization method. The locomotive properties of arthropods were revealed experimentally.