How to cultivate rotifers in large outdoor areas of water?
2018-06-16 16:01:58
A large number of rotifers can be used outdoors cement pool or earthen pond, single pool area 50-600 square meters, should not be too large. The location of the pool must be convenient for seawater irrigation and the introduction of freshwater. Before cementing, the cement pool must be washed clean, washed with filtered seawater, air-dried for 1-2 days, and then poured into seawater filtered or filtered by sand, which should be drained. Pool water is mixed with fish rattan (2 grams per cubic meter of water) and 666 powder (10-15 grams per cubic meter of water). This method is low in cost and can kill rotifers against predators without damaging planktonic algae and rotifers. After the clear pond is poured into filtered seawater, the water depth is 40-80 cm, and then fertilize. Apply 100 g of ammonium sulfate per ton of water, 15 g of superphosphate and 5 g of urea. Add appropriate amount of ferric citrate and chelating agent or other application. Culture single-cell algae fertilizer. Should be inoculated with Chlorella vulgaris or Platymonas subtilis after inoculation. The inoculum volume should be slightly green for the degree of color. If there is aeration device, the number of cultures can be increased. In good condition, the water in the pool turns green after about a week (the density of Chlorella is 10 million. - 20 million cells/ml). At this time, rotifers can be vaccinated at a density of 1-2 individuals/ml. During the cultivation period, feed should be replenished timely. Fertilizer (every 5 or 6 days) can be used to grow unicellular algae so that the algae can maintain a certain density or be fed to yeasts (see the previous article for feeding methods). Note the changes in water quality. When the weather is boring, the quality of hot water may deteriorate. When it is necessary to add fresh seawater or freshwater in a timely manner, when the density of rotifers is high, rotifers may cluster on the surface of the water in the morning before sunrise. The rotifers may appear white or pink, and they should receive some of them immediately. Otherwise, the maximum density will be reached. Suddenly a lot of death. After supplementation, supplement the single-cell algae seawater to continue breeding. Microscopic examination revealed that the rotifer population in the pool consisted of three types: unimmunized eggs, adult summer eggs, and dormant egg adults. In general, when the temperature is appropriate, the rotifer group with sufficient feed and good growth and reproduction conditions should be the swift and lively individuals, and the individuals with summer eggs (some with 2-4 eggs) in the larvae should be increased. I have countless eggs or dormant eggs, fasting, male worms, dead shells, sinks, and weak activities, all of which are bad phenomena. However, dormant eggs are not formed only when the environmental conditions are poor, but they usually occur. Only when the rotifer density reaches the highest peak, the egg production rate in the quitting bed is the largest. Under normal circumstances, the rotifer density is vaccinated after 7 and 8 days. To achieve 100 individuals / ml or more, you can harvest. Inoculation method can be used, with several pools, sub-pool inoculation, 7, 8 days inoculation of a pool, so that the pool to reach the harvest density, to ensure the continuous supply of rotifers, can also be used for harvest, harvested once a day, mining Received 20-25%, collected immediately after harvesting uni-cell algae seawater supplement, and continue to culture.
The biggest problem in the production of rotifers is the sudden deterioration of breeding conditions or the sudden drop in rotifer density. This may be due to the fact that in the long-term culture, rotifers metabolize decomposition products and cause deterioration of water quality (such as levitation Increased, reduced dissolved oxygen, protozoa breeding, etc.) The solution is to change the water to re-cultivate. In addition, the sudden drop in water temperature to 3-4°C can also make the rotifer density suddenly decrease, or even cause death. Therefore, it is advisable to use a large pool to achieve stable culture. Do control the temperature.
The biggest problem in the production of rotifers is the sudden deterioration of breeding conditions or the sudden drop in rotifer density. This may be due to the fact that in the long-term culture, rotifers metabolize decomposition products and cause deterioration of water quality (such as levitation Increased, reduced dissolved oxygen, protozoa breeding, etc.) The solution is to change the water to re-cultivate. In addition, the sudden drop in water temperature to 3-4°C can also make the rotifer density suddenly decrease, or even cause death. Therefore, it is advisable to use a large pool to achieve stable culture. Do control the temperature.
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