Adult ten knives, 2-11 year old child 5 knives. The aquarium is the smallest one I have ever been to. The conductor said that it can be visited in ten minutes. Fortunately, it can take half an hour to stroll slowly. It is divided into indoor and outdoor parts, introducing water grass, jellyfish, fish that are good at camouflage, mangroves, etc. There is a touch tank outside that can touch sea cucumbers and starfish. It's still fun.