Three treasures of Ninghe: whitebait, purple crab, and reed grass. Silverbait is an anadromous fish that grows in the sea and spawns in the river. Ji Canal flows into the Bohai Sea and is a tidal river, which is suitable for the migration and reproduction of whitebait. Especially the whitebait produced in the middle reaches is more distinctive, with gold eye circles and silver eye circles, and is delicious. It can be called the best on people's tables at that time. After liberation, with the economic development and water shortage on both sides of the Ji Canal, the number of whitebait showed a decreasing trend; later, in order to prevent the intrusion of sea water, a tide-proof gate was built near the entrance of the Ji Canal. The construction of the gate blocked aquatic life. The animals migrated and multiplied, and the whitebait became extinct. Purple crabs, which are often referred to as river crabs by locals, are also anadromous aquatic products, that is, they mate in places where saltwater and freshwater are mixed, and there are male and female species. However, with the construction of tide-proof gates, the number of river crabs has also shown a decreasing trend. In the early 1980s, the county was the first to successfully carry out artificial breeding of river crabs in the city, and gradually developed into the county's leading aquaculture product and Tianjin's famous agricultural product. In recent years, the Qilihai crab industry has achieved rapid development due to the registration of the Qilihai crab trademark, the establishment of the Qilihai Crab Breeding Association, the promotion and application of new breeding technologies, and the establishment of crab processing enterprises. Reed is a perennial plant. This plant can grow naturally as long as there is water without sowing or field management. It can be used to weave mats, baskets, paper making, etc. In the past, it became the main sideline income of the local people, and was called "hardcore" by the locals. crops". Nowadays, reeds mostly grow in towns and villages around Qilihai. However, in the 1960s, due to the abandonment of reeds to grow food, the area of ??reed lands was greatly reduced. By the 1980s, with the development of various business models, many tidal flats began to resume the growth of reeds. The reed area was gradually increased. Now, local people are raising fish and river crabs in the reed swamps, making it an important source of income for local people.