When did the herring in Hangzhou Botanical Garden start to be raised? What is the oldest age of herring?
The spring eye of Yuquan was first discovered in the Southern Song Dynasty. It has a history of 1400 years and is famous for watching big fish. As early as the Song Dynasty, Yuquan began to raise fish. War of Resistance against Japanese Aggression period, the big fish was killed by the Japanese. At present, herring was stocked during the reconstruction of Yuquan after the founding of the People's Republic of China. The number of herring is more than 100, the longest is 1.5 m, and the heaviest is about 100 kg.