What problems should be paid attention to before fish farming

1. Fish pond shape diversification: fish pond shape is often rectangular, pit pond type, in order to give full play to the three-dimensional benefits of aquaculture water. The area of single fish pond is generally about 0.067 ha (mu, the same below), the depth of the pond is 2.5-3m, the ratio of length to width is 5:3, and the slope coefficient is 2-3. Construction modeling can be easy before difficult, to create some transitional fish ponds, such as "Hui" font, high and low type, "well" shape, "field" shape and so on, in which the "Hui" shape is the most ideal transitional fish pond.

2. Supporting the drainage and irrigation system in time: the drainage and irrigation system is required to be carried out synchronously with the construction of fish ponds. In the planning and design, reserve the location of drainage and irrigation ditches. In the concrete construction, the key point is to build the branch canal and bucket canal of the stereotyped fish pond. The main canals, trunk canals and drains can be simplified due to bad conditions and left for construction when the project is completed. In terms of building forms and materials, open channels, positioning and stereotyped channels can be made of masonry materials, and earth canals are used without positioning and finalization. Fish blocking facilities are best made of steel fence, the basic requirements are to stop (fish), flow (water) smoothly, resistant to (wind and waves) impact.

3. Ensuring energy and power supply: the construction of fish ponds per 0.067 hectares as a production unit, according to the technical and economic requirements of the designed unit yield of 750kg: 1 kW of total power per 0.067 ha, equipped with 0.3 kW aerator with a power of 13 kW, 1 axial flow pumping station with a diameter of 30 cm, and 3 submersible pumps with a diameter of 15 cm and a power of 2.2 kW. This can ensure that in the high temperature season of July, August and September, about 1 / 5 of the amount of water in the pool can be exchanged every day, so that the quantity and quality of the pool water can meet the needs of fish growth.

4. scientific selection of culture mode: for the newly opened fish ponds, due to the light water quality, it is appropriate to choose the culture mode of herbivorous fish, omnivorous fish and filter-feeding fish. The amount of seed is released according to the designed yield of 1max 6, and the average specification of fish species is about 0.05 kg. The proportion of all kinds of fish is: grass carp, blunt snout bream: common carp, crucian carp, carp: silver carp, bighead carp 4:4:2, and a small number of herring, mandarin fish (5-10 per 0.067 ha). The breeding mode of grass carp should be selected as the main breeding mode. 2500 grass carp summer flowers, 1000 silver carp and bighead carp, 1000 silver carp and bighead carp, 100 Jian carp and high-backed crucian carp summer flowers should be released per 0.067 ha, and 1000 grass carp, blunt snout bream and silver carp, bighead carp, crucian carp and other fish can be raised.