Tubo fish is a common name, and its scientific name should be "Tangyan fish". Once widely lived in tropical and subtropical seawater and fresh water. The Yangtze River basin belongs to the temperate zone, but before1980s, there were rivers and inland ponds in the south of the Yangtze River. The popularity of Tubo fish is also related to the World Expo. The night before the opening of the Shanghai World Expo, a grand state banquet was held at the Shanghai International Convention Center, which was called "the first banquet of the World Expo". One of the main courses of dinner is shepherd's purse and snapper. At present, many hotels in Jiangsu and Zhejiang have begun to write black fish in shepherd's purse pond as a typical spring delicacy in Jiangnan. The market demand for loach (that is, indigenous fish) is increasing gradually. Bottom fish like to live in crevices of rocks or hidden places, such as silt and weeds. Eat shrimp. Laying eggs from April to June, taking crevices, empty mussels and broken jars as ovaries. Male fish have the habit of guarding their nests and eggs. Lots of meat, delicious. In Jiangsu and Zhejiang provinces, Sarcandra glabra and water shield are both famous dishes. Distributed in the middle and lower reaches of the Yangtze River and Fujian. I like to live in shallow water mixed with sediment or weeds and gravel, and often hide in cracks in rocks. The reproductive period is in May. Eggs are sticky, and males have the habit of protecting them. Feed on shrimp, small fish and insects. It is a common edible fish with low yield. Distributed in coastal areas and the middle and lower reaches of major rivers. The Yalu River, Liaohe River, Pushi River, Dayang River and Liaohe River in Liaoning, and the Heilongjiang, Yellow River, Yangtze River, Pearl River and Minjiang River basins in China. Foreign countries are found in the Philippines, North Korea and Japan.