The construction of fish ponds is usually carried out in conjunction with irrigation and water conservancy in winter and spring, and about 30% of them will not be completed until late spring and early summer. The following technical measures are recommended:
1. Diversification of the shape of the fish pond: The shape of the fish pond is often rectangular and pit pond type, so as to give full play to the three-dimensional benefits of the aquaculture water body. The single-mouth fish pond area is generally about 0.067 hectares (mu, the same below), the pool depth is 2.5-3 meters, the aspect ratio is 5:3, and the slope factor is 2-3. The construction modelling can be easy and difficult, and some transitional fish ponds can be created, such as "back" type, high and low type, "well" type, and "field" type. The "back" shaped fish pond is ideal. Transitional fish ponds.
2. Timely supporting drainage and irrigation system: It is required that the drainage and irrigation system be synchronized with the construction of the fish pond. In the planning and design, reserve the location of the irrigation and drainage ditch. In the specific construction, the construction of the branch and culverts of the shaped fish pond will be focused on. The total canals, trunk canals and drainage ditches can be concise since they are to be built. In construction forms and materials, the open channel, positioning, and stereotyped channels can be used as masonry materials, and unaligned and unshaped can be used as earth channels. Barrier facilities are best made of barriers made of steel, the basic requirement is to block (fish) to live, flow (water) smooth, anti-(wind) impact.
3. Guarantee energy and power supply: The construction of every 0.067 hectare fish pond is used as a production unit, and the technical and economic index of 750 kg per unit of design requirements: 1 kilowatt per 0.067 hectare of total power, 0.3 kW aerator, and the power is 13 kilowatts; a 30-centimeter axial-flow pumping station; and 15 submersible pumps with a power of 2.2 kilowatts and a diameter of 15 centimeters. This ensures that in the hot season of July, August and September, the amount of water in the pool can be changed by about one-fifth every day, so that the amount and quality of pool water can meet the needs of fish growth.
4, scientific choice of breeding mode: the newly opened fish ponds, due to light water, should choose to eat mainly herbivorous fish, supplemented by omnivorous fish, and appropriate breeding of filter-feeding fish breeding mode. The amount of seed to be placed is 1/6 of the designed yield, and the average species size of fish is about 0.05 kg. The ratio of all kinds of fish is: grass carp, group head lice: pupa, pupa, pupa: pupa, pupa are 4:4:2, and is accompanied by a small amount of herring and bream (5-10 birds per 0.067 hectare). Fish breeding should adopt the grass-fish-based breeding mode, with 2,500 grass carp species per 0.067 hectares, 500 group summer flowers, 1,000 summer and summer flowers, Jianye and Gaobei summer flowers 100. The tail; can also be the main carp species, each 0.067 hectare carp summer 3,000 fish rearing, the provision of 1,000 grass carp, group head locust and fish, oysters, oysters and other fish of the summer.
1. Diversification of the shape of the fish pond: The shape of the fish pond is often rectangular and pit pond type, so as to give full play to the three-dimensional benefits of the aquaculture water body. The single-mouth fish pond area is generally about 0.067 hectares (mu, the same below), the pool depth is 2.5-3 meters, the aspect ratio is 5:3, and the slope factor is 2-3. The construction modelling can be easy and difficult, and some transitional fish ponds can be created, such as "back" type, high and low type, "well" type, and "field" type. The "back" shaped fish pond is ideal. Transitional fish ponds.
2. Timely supporting drainage and irrigation system: It is required that the drainage and irrigation system be synchronized with the construction of the fish pond. In the planning and design, reserve the location of the irrigation and drainage ditch. In the specific construction, the construction of the branch and culverts of the shaped fish pond will be focused on. The total canals, trunk canals and drainage ditches can be concise since they are to be built. In construction forms and materials, the open channel, positioning, and stereotyped channels can be used as masonry materials, and unaligned and unshaped can be used as earth channels. Barrier facilities are best made of barriers made of steel, the basic requirement is to block (fish) to live, flow (water) smooth, anti-(wind) impact.
3. Guarantee energy and power supply: The construction of every 0.067 hectare fish pond is used as a production unit, and the technical and economic index of 750 kg per unit of design requirements: 1 kilowatt per 0.067 hectare of total power, 0.3 kW aerator, and the power is 13 kilowatts; a 30-centimeter axial-flow pumping station; and 15 submersible pumps with a power of 2.2 kilowatts and a diameter of 15 centimeters. This ensures that in the hot season of July, August and September, the amount of water in the pool can be changed by about one-fifth every day, so that the amount and quality of pool water can meet the needs of fish growth.
4, scientific choice of breeding mode: the newly opened fish ponds, due to light water, should choose to eat mainly herbivorous fish, supplemented by omnivorous fish, and appropriate breeding of filter-feeding fish breeding mode. The amount of seed to be placed is 1/6 of the designed yield, and the average species size of fish is about 0.05 kg. The ratio of all kinds of fish is: grass carp, group head lice: pupa, pupa, pupa: pupa, pupa are 4:4:2, and is accompanied by a small amount of herring and bream (5-10 birds per 0.067 hectare). Fish breeding should adopt the grass-fish-based breeding mode, with 2,500 grass carp species per 0.067 hectares, 500 group summer flowers, 1,000 summer and summer flowers, Jianye and Gaobei summer flowers 100. The tail; can also be the main carp species, each 0.067 hectare carp summer 3,000 fish rearing, the provision of 1,000 grass carp, group head locust and fish, oysters, oysters and other fish of the summer.
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