First, the preparation of fry cultivation pool
(I) Fry cultivation pond
Choose fish ponds with adequate water sources, clean water, and easy injection and drainage; the pool shape should be neat, with rectangles as the best; area 1-3 mu; depth of water 1-1.5 meters; flat bottom of the pool, appropriate amount of sludge (6-10 cm); water-free grass Weeds; fish ponds do not leak. The fish should be cleaned before entering the pool, remove excess silt, level the bottom of the pool, repair the pool, fill gaps, and eradicate weeds on the embankments.
(b) Clear Pond
The drug clear pond should be selected at noon on sunny days to fully exert its efficacy and enhance the role of drugs. At present, there are mainly the following drugs in Qingtang:
1. Lime Quicklime forms calcium hydroxide in water and generates a large amount of heat energy. In a short time, the concentration of hydrogen ions drops sharply, and the pH rapidly rises to above 11 and it has a strong biological effect. It can kill large aquatic animals and also kill fish parasites, pathogens, and harmful insects and other larvae that are hidden and thriving in silt. After being disinfected with quicklime, various organic acids in the sludge can be neutralized due to the alkali free, change the acidic environment, and make the pond show a slightly alkaline reaction. In addition, quicklime also has a role of fertilizing, increasing the buffer capacity of water, so that the nitrogen, phosphorus, potassium and other nutrients that are absorbed by the sludge are released again, which can increase the fatness of the pool water, which is beneficial to the growth of plankton.
Lime clear pond, there are two methods of dry clear pond and clear pond. Dry clear pond is the choice of sunny water drained, leaving about 6-10 cm of water, digging a few pits in the pool evenly, the quick lime poured, dissolved after the hot splash in the pool and around the pool. Use 50-150 kg of lime per acre. Lime is easy to absorb moisture, so it should be used with it. The lime disappears and it takes 7-10 days. 9-12 days after the clear pond, the rotifers reached their peak.
2. Bleached bleach meets water to form basic calcium chloride and hypochlorous acid. Hypochlorous acid releases new eco-oxygen immediately, which has a strong bactericidal effect. Bleached clear pond, its medicinal properties disappear quickly, and it is more suitable for fish tanks that are eager to use.
The amount of bleaching powder used in the clear pond should be calculated based on the available chlorine content. The chlorine content of the good quality bleach is 30%. Such as dry pool clear pond, bleaching powder 4-5 kg ​​per mu; such as with water clear pond, water depth of 1 meter, bleaching powder 13 kg per mu, that is, per cubic meter of water, with bleach 20 grams. When used, add a small amount of water to the bleach and mix it into a paste. Add water to dilute the whole pool. Clear pond after the toxicity disappeared 3-5 days, water and fertilizer when the clear pond is less effective, should increase the amount of discretion.
3. Tea seed cake The rapeseed cake is knocked into small pieces and soaked in water. The next day can be used. 30 grams of tea seed cake per cubic meter of water. When the water temperature is about 25°C, the tea seed cake disappears after 7-8 days.
(3) Water Injection and Base Fertilizer
In the 7-10 days before the fish seedlings, the water injection is about 50 cm. The water level injected should not be too deep, otherwise the water temperature will not increase easily and the water quality will turn slow. When water is injected, it must be filtered with 60-80 mesh at the inlet to prevent wild fish and other predators from entering the pool. The basal fertilizer was put in place in a timely manner to provide a lot of palatability food for fish fry. After the spawning in Brazil, the basal fertilizer should be applied in the fry pool, because the peak period of rotifers can only occur 4-6 days after the basal fertilizer is applied, and the time of the emergence of the lunar spot of the Brazilian maggot seedling can be synchronized. The order of dominant species of zooplankton was: protozoa, rotifers, cladocera, and finally copepods, among which protozoa and rotifers were palatable baits for brazilian carp seedlings. Basal fertilizer is mainly based on green manure from the Compositae plant. It is appropriate to apply 150-200 kilograms per acre, or apply the same amount of manure.
(D) Check the water quality and water temperature
Before the fry in the pond, the water quality and water temperature should be checked to see if the drug toxicity disappears and whether the water temperature is appropriate. When checking the water quality, it is advisable to take a pot of water at the bottom of the pond and put 20-30 fry and raise it for 1 day. If the fry is normal, the medicinal property has disappeared. If clear lime is used to clear the pond, the pH can be measured. When the pH is lower than 9, it indicates that the medicinal properties have disappeared.
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