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The purpose of this research is to investigate the necessary tools and their functions under the theme of information design and communication in 3-dimensional space created by web3D technology. This time, we have developed and verified "Aqua Place, " a web contents o virtual aquarium containing 3-dimensional simulation by VRML within a virtual fish tank. Through this development and verification, we focused on the functions for observation in 3-dimensional space and on the method for revealing information about creatures as a database. In conclusion, it demands an operating condition which makes it possible to observe each creature individually as well as an information design of 3-dimensional ecosystem simulation in a virtual fish tank. On the other hand, we saw that there are restrictions against design with 3D-WWW environment by VRML and HTML.