According to the relevant laws and regulations, the water surface of the reservoir as a drinking water source can be contracted to individuals to engage in fish farming and operated in a clear water ecological farming mode in accordance with the principle of "scientifically utilizing biological resources and purifying and protecting the water quality of the reservoir ecosystem". However, in the process of aquaculture, in order to protect the water quality, the contractor shall not raise fish in cages or put any feed or fertilizer into the reservoir area.
In other words, some "clear water fish" can be raised to purify the water. Fertilization, feeding and medication are strictly prohibited in the feeding process, and the way of "letting people raise the sky" is adopted. Generally, silver carp is the main species, and the economic benefit is not high.