Introduction to the Freshwater Biology Hall: The Freshwater Biology Hall of Qingdao Aquarium is connected to the underwater world. The museum simulates the ecological environment of a tropical rainforest. When you walk into the exhibition hall, you will immediately feel the magnificence and mystery of the tropical jungle. Various rare freshwater creatures and fine tropical fish are on display in the museum. There are huge and majestic arapaima; there are bright and precious colorful angel fish and red dragon; there are Chinese sturgeon, alligator and giant salamander that are listed as national first and second level protected animals. More than 40 varieties are on display. The exhibition hall is equipped with accurate and vivid explanatory boards and popular science display boards to allow people to learn about freshwater organisms and ecological knowledge.