Fish are widely kept around the world and said to bring stress-reducing and relaxation. Aquariums have long played an important role in the protection of fishes, research on their living, dissemination and enlightenment of knowledge, and entertainment. Though aquariums have introduced a variety of technology for the display to achieve these role, it is difficult to raise awareness of environmental issues occurring in distant oceans. In this study, we propose the use of technology of body ownership with the environment in which fish grow, and creating the feeling of symbiotic partner with fish to make users think of aquatic environment as an issue that affects themselves. By using body ownership techniques to make the aquarium and the space it contains, including the fish, become part of their own body, people become more interested in maintaining the space as a whole and, ultimately, an appropriate environment for the fish. The result shows that it is possible to induce a sense of body ownership with the fish tank, including the fish, by changing the shape of the fish tank and applying synchronous stimulation. The tendency was also confirmed that this method make the feeling that they are symbiotic partners.
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