From September 14 to 30, 2019, I visited Northern Vietnam in cooperation with the Research Institute for Aquaculture No.1. The subject of my visit was the teaching and transfer of experience regarding the possibility of improving the quality of water during harvesting of fish ponds. In addition to several lectures and field work, I had the opportunity to visit several different fish and shrimp farms. It was also very inspiring to get acquainted with Vietnamese gastronomy, especially in fish and seafood.