Perch makes chrysanthemum yellow wine full of bottles, the sunset is cool and the tide is sad. What does it mean?

This is a poem written by Bai Juyi, a poet in the Tang Dynasty, in Farewell to Lower Jiangnan in Fujian. It means: the perch is beautiful, the chrysanthemum is yellow, and the wine is full, which makes people feel a little cold at night. Boating in the rivers and lakes is the time when the tide is rising and the joy is endless. This poem depicts the beautiful scenery of the south of the Yangtze River and the author's feeling of roaming on the river, and expresses the author's love and praise for the natural beauty of the south of the Yangtze River and his yearning for a free and unrestrained life.