Editor's note:
Wild boar is going down the mountain! "Monkey Paper" has arrived at my balcony! News of wildlife entering the city frequently appeared on social media. In fact, we live around us with many native wild animals, who are neighbors, but we rarely know them. Only by understanding, being friendly and accompanying can all things be harmonious and cultivated to achieve success. Xinhua Daily·Jianghuidian, in conjunction with Jiangsu Wildlife Protection Station, Jiangsu Forestry Science Research Institute, Nanjing Institute of Fisheries Science, Nanjing Hongshan Forest Zoo, , etc., launched the "Eye of the Secret Realm·Friends of Humanity" calendar column, which will take you to pay attention to both familiar and mysterious "animal neighbors" through the perspectives of infrared camera , animal observers, etc. Biodiversity is the basis and vitality of human homes. Every solar term day, we will also invite solar term officials to conduct special recommendations and broadcasts on that day. Today, let’s meet the shad together.
Beautiful scales
后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后后� Their sides and abdomen are beautifully silvery white, and their backs are gray-green. They are oval in shape, with flat heads and blunt front ends. Their snouts are milky white, their fins are light yellow, and their dorsal and caudal fin edges are gray-black. In the juvenile stage, there are spots on the side of the body.
The shoal appeared in the Chinese people's vision very early, and there are many records of "shoal". There are records in "Erya", "Dangyang" and "Yusi". According to research, the above three titles refer to shoals. There are also records in the "Lei Pian" compiled by Wang Zhu and others and compiled by Sima Guang and : "Sometimes, the Wu people think it is a treasure, which is the fish in the fish temple."
Freshwater and seawater are suitable for both
shads usually live in seawater, and use plankton such as copepods, shrimps, diatoms and as food. In late spring and early summer, they will swim back to freshwater to reproduce. The young fish of the shad grow in the rivers and lakes. They usually enter the sea when they grow to about 150 mm and continue to develop and grow in the sea.
The egg-laying period of shads is from early June to late August. A shad usually takes more than 1 million eggs in a single time. They will choose to lay eggs on the river bottom sandy pebbles with water temperatures ranging from 25 to 32°C. When breeding, the shad will be active in groups of three or five on the upper layer of the river. The male and female chase each other. After the juvenile fish hatched, it will take 29 days to fully grow scales.
Although the taste is delicious, it also needs to be protected
液液 has been an important economic fish in China since ancient times. Their scales contain a lot of fat, which tastes delicious and has a smooth meat. Qing Dynasty poet Zheng Banqiao has a poem saying: "Fresh bamboo shoots in Yangzhou take advantage of the shad, and boil them in the spring breeze at the beginning of March." It describes the plump taste of shad. However, for some time, due to the pollution and overfishing of water quality in the Yangtze River, especially the fishing of juvenile fish, wild juveniles have become almost extinct. Today, the ten-year fishing ban plan of the Yangtze River and a series of ecological and environmental protection measures have restored the pig population a lot of vitality. We call for: Although the taste of shad is beautiful, it still needs protection!
Writer: Jin Yiwei
Map: Zheng Cheng
Picture: Nanjing Porpoise Aquatic Biology Conservation Association
