The meaning of this verse is as follows:

"The egrets fly in front of Xisai Mountain, and the fish of the Peach Blossom Flowering River Mandarin Fish are fat" is from "The Fisherman's Song" by Zhang Zhihe of the Tang Dynasty. The meaning of "Egrets fly in front of Xisai Mountain, Peach Blossoms and Mandarin Fish in Flowing Water" is that in front of Xisai Mountain, egrets are soaring freely, fat Mandarin fish swim happily in the river water, and the peach blossoms floating in the water are so bright and full of color. "The egrets flying in front of Xisai Mountain, the fat fish in the peach blossom water Mandarin Fish" expresses the author's mood of yearning for a free life through the natural scenery and the fisherman fishing.