Ecological Recirculating Aquaculture Cod Test

Because of its fast growth, strong disease resistance, and good market prospects, carp is favored by farmers. At present, carp has become one of the major cultured species in Shandong, Sichuan and Hubei. Most of the aquaculture models are cage cultures, which cause serious pollution to the water environment and are restricted by geographical restrictions, so it is not easy to promote them on a large scale.
In order to explore a new type of energy conservation and environmental protection, which is limited by water sources, can significantly increase unit production and commercial fish quality, and can be accepted by the general farmers, we conducted a study on the price-effectiveness of the eco-circulating aquaculture system. At the same time, we conducted a high-density breeding test for carp at our breeding base. A total of 6067 kg of commercial carp were raised in 4 cement pools, with an average tail weight of 8 kg, a feed coefficient of 1.5, and an output value of 184,060 yuan. The project investment in the entire eco-friendly circulating aquaculture workshop was 250,000 yuan, after deducting feed costs, electricity fees, etc., can recover costs in 2 years, the economic benefits are very significant.
Materials and Methods
1. Steel frame construction of plastic greenhouses The greenhouse covers an area of ​​350m2. The top of the greenhouse is provided with automatic collection and shade nets. There are 40cm wide and 60cm deep drainage ditch around the greenhouse. Plastic film lifting devices are installed on both sides of the greenhouse to facilitate ventilation.
2. The main pool is equipped with 4 main pools. The area is divided into 50m2 and water depth of 1.5m. The pool has a circular structure with a drainage port in the middle. The pool is slightly inclined to the middle to facilitate drainage.
3. Water treatment system
1) 1 settling sedimentation tank with an area of ​​50m2 and water depth of 2m. The treatment tank is mainly used for primary physical precipitation, and 50 kg of each of the white maggots is placed in the pond to filter the larger feed baits and fish feces. There is a sewage outlet in the pool.
2) Two sedimentation tanks with an area of ​​30m2 and a water depth of 2m. In the middle of the two sedimentation tanks, a brick wall is formed to form a “U” type roundabout and the floor is covered with gravel to form a sand bed. According to the particle size, it is laid in three layers, each layer thickness is 60cm, in which the bottom layer is coarse sand, the sand diameter is not less than 4mm, the middle layer is medium sand, the particle size is 3-4mm, the upper layer is fine sand, and the particle size is 1-2mm. The sedimentation tank mainly performs secondary filtration on the water to remove fine particles in the water.
3) A biological purification pool with an area of ​​30m2 and a water depth of 2m. An aeration tube is laid at an interval of 0.5 m at the bottom of the pool and a 750 W vortex aerator is added to aerate the oxygen; a microbe attachment base is suspended at intervals of 0.5 m from the water body. The surface of the water body near the catchment ditch lays a foam board with an area of ​​15m2. It is used for planting aquatic plants. We choose ornamental plants as artificial wetland plants, and the main varieties are alfalfa, saxifrage, mung bean and so on.
4) One catchment ditch with an area of ​​10m2 and a water depth of 2m. Install a nano-oxygenation water lifting device in the catchment ditch. The installation method is as follows: 20 nanotubes are installed side by side horizontally in the catchment ditch at a depth of 50cm from the water surface. Each nanotube has an inner diameter of 10 mm, a length of 120 cm, and an interval of 5 cm. The nanotubes are connected to the main gas supply and equipped with a 2.2 kW gas pump.
4. Aquaculture wastewater treatment The aquaculture wastewater discharged from the main pool flows through a common drainage channel into the sedimentation filter tank. After primary sedimentation, most of the organic debris is ingested by the fish in the pool. Fine particulates are intercepted by secondary sand filtration. Secondly, the microorganisms on the attachment base degrade the ammonia nitrogen and nitrite, significantly reduce the chemical oxygen demand and the biological oxygen demand and increase the oxygen content. After the plant absorbs the nutrient salt, the purpose of the purified water is reached. Finally, the nanometer oxygenation water lifting device is passed through. The water was introduced into the ditch and evenly distributed to 4 aquaculture ponds to achieve the recycling of the pool water.
5. Cultivation of microbial colonies The biological purification pond is filled with pond water, introduced into the algae species or directly sprinkling artificial algae species into the water body, and at the same time, the “Arcorn” water treatment microorganism attachment base is suspended in the water body. Sprinkle 20kg of organic bio-fertilizer into the water and continue aeration for 15-20 days. The bacteria, algae and other microorganisms begin to grow on the attachment base.
6. After the fish is cultured, the fish is released. Each pool in the main pool was stocked with 200 rearing hybrids (Acheronidae), 1 kg in size, and 100 algae of 0.5 kg each in a 1st settling pond.
7. Aquaculture management
1) Feeding. The hybrid sturgeon has strong feeding ability and strong growth. The early daily feed rate can account for 3% of the body weight. It gradually decreases with the increase of body weight in the later period. It feeds 3 meals a day and each meal is dropped 3 times, each time interval 10- 15min is appropriate. Because of the small change in water temperature of the pool water, it can be maintained at a temperature of 15-23°C for a long time, which is very suitable for the feeding and growth of the carp. The actual daily feeding amount can be flexibly controlled according to the water quality and the feeding conditions of the fish.
2) Water quality regulation. a. When the fish body enters the pool, it will have a strong stress reaction, and the water quality will change easily. In particular, the ammonia nitrogen and nitrite will rise rapidly. At this time, pay close attention to the fish activity and splash the nitrifying bacteria into the pool. Nitrifying bacteria and other microbial preparations, if necessary, to change the water treatment. 2-3d after the fish into the pool should not be fed, and the amount of feeding should follow the principle of gradual and orderly progress.
b. During the later period of aquaculture, microorganisms should be regularly replenished to the biological purification tank to prevent the failure of the biological community and reduce the water treatment capacity. With the increase of feeding amount, the time interval for each microorganism to be injected should be shortened, generally 10-15 days is appropriate. At the same time, Bacillus subtilis, lactic acid bacteria and other microorganisms are regularly added to the feed to increase the absorption and conversion rate of the feed in the intestine and reduce the ammonia nitrogen and other emissions.
c. Adhere to monitoring the water quality on a daily basis and observe the water quality. Once there is a change, take immediate action.
3) Prevention and treatment of fish diseases. The entire test process was conducted in accordance with the technical specifications for the production of pollution-free aquatic products. Garlicin, Sanhuangsan, and hepatoprotective drugs were regularly added to the feed to achieve timely prevention.
4) Do a good job of breeding log, including water temperature, feeding, feeding conditions, fish activity, etc., and make a test every month to determine the growth of fish and timely adjust the amount of feeding.
test results
1. Water purification effect. In February 2009, the water treatment system was completed and a closed loop system was formed in series with the factory aquaculture plant. The circulatory system operates day and night driven by a sump pump. The water quality monitoring situation of the import and export of fish ponds is shown in Table 1. (Monthly random draw 1d)

2. The effect of fish growth. The fish pond was put into production from February to October for a total of 8 months. During the period, the water quality is in good condition, the fish body is feeding heavily, and the yield and feed coefficient of the hybrid larvae per unit water are shown in Table 2. In addition, 144kg of whitefish and 190kg of calyx were harvested.

The average price of hybrids harvested was 30 yuan/kg, carp 5 yuan/kg, and carp 7 yuan/kg. The experimental expenditure of squid species is 25 yuan/tail, and the squid is priced at 8,000 yuan/t. Infrastructure investment and supporting machinery and equipment costs 250,000 yuan. During the experiment, the input of feed was 3,6429.6 yuan, electricity and other inputs were 1,8992.4 yuan, the total income was 184,060 yuan, and the cost was 30,3421.6 yuan. Since the trial period is only 8 months, it is estimated that the cost can be recovered in 2 years, and the revenue will increase greatly after 2 years.
Analysis and discussion
1. The system uses the principle of natural sedimentation, sand and sand interception, microbial decomposition and plant absorption to effectively regulate water quality; at the same time, the water temperature is suitable and can be maintained between 15°C and 25°C for a year, plus the feeding capacity of carp. Strong, fast growth, strong disease resistance, fast capital backing. The production process is suitable for large-scale promotion, independent of water sources and geographical restrictions and can be operated on its own or in combination.
2. The most important part of this ecologically recycled water process is microbial and plant purification systems. In the process of aquaculture, compound bacteria preparations should be applied regularly to maintain the balance of flora. At the same time, we must choose the species of ornamental plants suitable for systemic growth and diversify as much as possible. Some plants are used as the main plants of the family ecological fish tanks, and they are regularly cut and sold. Bring additional economic income to the production unit.
3. The instability of the water quality in the early stage of cultivation is mainly due to the stress produced by the fish, the secretion of a large amount of mucus, and the ability to purify the wetland has not yet fully formed. Carefully maintain and pay close attention during this period.

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