Is the climate and water source suitable for building a fish pond in Foya Town, Longnan City, Gansu Province?

Excellent and relatively suitable for building fish ponds. (can be built).

Longnan has a semi-humid climate, with warm summers and annual precipitation of about 600mm.

Gansu is generally dry and short of water, but Longnan is the region with the richest water resources in Gansu. There are many rivers in the territory with abundant water.

1. Suggestions for building fish ponds:

1. Try to avoid building on soil with vertical bedding. The vertical bedding structure has loose soil and is prone to soil erosion.

2. It is suitable for construction on parallel bedding and can effectively prevent water and soil erosion.

3. Suitable for construction on synclines. The bottom of the syncline has hard lithology, is not easily eroded, and is easy to accept sedimentation. It is a good water storage structure.

2. Water quality control issues.

1. Stir the sediment regularly. Stirring the sediment can promote the continuous decomposition of the sediment and indirectly control changes in water quality. The area stirred each time should not be less than 1/3 of the water area, and the stirring effect is best at noon on a sunny day, but do not stir in hot and low pressure weather.

2. Transplant aquatic plants. As the primary "productivity" of water bodies, aquatic plants can control the growth of algae in fish ponds and play a very good role in water purification. Farmers can rationally introduce and transplant aquatic plants such as Hydrilla verticillata, Houttuynia cordata, water hyacinth, and duckweed into the water body according to the actual conditions of the fish pond, local conditions, and scientific planning to adjust the water quality and improve the dissolved oxygen level.

3. Trap aquatic animals. Aquatic animals are "consumers" in water bodies. Appropriate transplantation can promote the balance of water body ecosystems and regulate water quality. For example, raising carp and crucian carp in traps can make full use of the residual organic matter in the water body, greatly reducing the decay and decomposition of organic matter at the bottom of the water body, and reducing the chance of pollution. Raising herring in traps can inhibit the consumption of nutrients and oxygen by organisms such as snails in the water body. Raising silver carp in traps can make full use of natural feed resources such as plankton in the water body and control the fertility of the water body. Raising bighead carp in traps can suppress rotifers in water bodies. Raising grass, bream, and bream in nests can ensure sufficient dissolved oxygen in the water and purify the breeding environment. Raising mandarin fish, snakehead, bass, etc. can effectively control the growth and reproduction of wild fish and shrimp in the water body, and reduce the pressure of competition with the main fish for food and oxygen.

4. The pH of the pool water not only affects the growth of fish, but also affects the nutrients in the pool water.

5. The selection of plants is very important. Different plants have a great impact on fish. Trees can improve water quality and maintain soil and water, but different tree species are suitable for different fish, so plant them carefully.