Abstract
In recent years, rapid changes in the global environment are also affecting marine ecosystems. For example, ocean acidification and rising sea temperatures are said to make echolocation difficult for marine mammals. A particular problem is that sea urchins eat all the seaweed. Seaweed plays an important role for marine life. Therefore, in this study, we developed a device to efficiently collect sea urchins. Devices for collecting sea urchins had previously been developed. However, there were issues with their suction power and size. In this study, we developed an underwater device that applies the ejector principle and maintains the same suction force. This device does not require a pump, which allows underwater robots to be made smaller and lighter. In addition, it is thought that this system could also be applied to collecting dead fish at fish farms. Currently, divers periodically dive underwater to capture the dead fish. Therefore, we also conducted experiments to confirm the effectiveness of this system in collecting dead fish.
https://ror.org/048nxq511 
