Investigation on the acoustic scattering signatures of Copepods-The first step to conducting acoustic survey on copepods-

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Properties of the animal's acoustic scattering(Target Strength : TS) were investigated in copepods which have the highest population among zooplanktons living in the ocean. TS of copepods were measured in a sea-water tank, and estimated using the theoretical model by measuring the acoustic parameters. Both TS were compared. As a result, it was confirmed that TS estimates matched the actual measurements of some individuals well while entirely differed with other individuals. When the differences were investigated, it was found that the former individuals did not have oil sac into the copepods body while the latter individuals had oil sac. We will further investigate this difference in detail.