On January 8, 2025, researchers from the Chinese Academy of Sciences reported significant advancements in the cultivation of vertebrates and aquatic plants in space. During the Shenzhou-18 mission, four zebra fish, along with aquatic plants, were sent to the Tiangong space station, where astronauts observed unusual behaviors such as swimming upside down.
The zebra fish, genetically similar to humans by 80%, serve as a vital model for studying human diseases. Over 500 laboratories across China are currently conducting research on zebra fish and related species.
Wang Gaohong, a researcher at the Institute of Hydrobiology, noted that both humans and fish face adaptability challenges in space environments. The team has created a closed ecosystem where aquatic plants produce oxygen through photosynthesis, supporting the fish's respiratory needs, while fish waste provides nutrients for the plants.
Feeding the fish involves a paste-like food that is carefully dispensed to maintain water quality. To date, 181 scientific projects have been implemented on Tiangong, covering biological experiments and new technology development.
Tiangong is expected to operate for approximately ten years and may become the world's only space station if the International Space Station, which China cannot access due to military ties, is retired as planned. China's space program has made significant strides, including the historic landing of the Chang'e 4 probe on the far side of the Moon and a successful Mars mission, making China the third country to achieve these milestones.