1. Water quality conditions: The water quality conditions of Ganzhou River are suitable for fish growth, the water temperature is moderate, the water level changes little, and the environment for fish survival and reproduction is excellent.
2. Ecological environment: The riverbed of Ganzhou River Basin is rich in aquatic plants with high sediment content, which provides sufficient food and habitat for fish.
3. Breeding and fishing: The red carp in Ganzhou River basin has also been cultivated and fished to a certain extent, which is one of the reasons for the large number of red carp.