Zebrafish, hornwort, and water in a watertight fish tank are the core elements of the China Space Station's first experiment on vertebrates other than human beings. The project, which aims to research aquatic life support systems in space, is part of the many scientific studies the Shenzhou-18 mission will undertake.

Professor Wang Gaohong, one of the scientists behind the experiment, tells CGTN why he hopes the fish will stay alive and be "happy". Watch the video for more.