Rotifers
Breeding rotifers is a comprehensive ecological conditioning work, not a product is common;
First: mainly used within 20 days of the shrimp seedling stage, so it should be cultivated before the seedlings are released;
Second: be sure to control the PH within 8.2 or at least within 8.4 (7.8-8.4), if the PH is too high, there is no rotifer breeding environment at all, no, at any cost to use citric acid a water to lower the PH, the dosage is even 25 kg / mu to use; PH determines whether there are high-quality rotifers in the water;
Third: to use special vitamins, such as yeast (marine red yeast is better) B vitamins or photosynthetic bacteria coenzyme Q biotin and the like. Therefore, either sprinkle with yeast powder, or cultivate some photosynthetic bacteria yourself, and start to sprinkle 5-10 kg/mu with photosynthetic bacteria culture solution (self-cultured) every day or every two days a week before the seedlings are released;
Fourth: need some energy such as glucose or sugar, sprinkle a few pounds /acre every few days;
Fifth: the sunlight can not be too strong, either shading treatment, or deepening the water color, the water temperature can not be too high, otherwise it is not good;
Sixth: Of course, do not forget the main nutrition: with fermented fish sauce, or fermented suckling pig feed, fermented egg and duck feed can be, or fermented soybean meal peanut bran meal or other protein raw materials, it is best to have animal protein raw materials together with fermentation is the best;
Seventh, management and maintenance operations: these "fermented nitrogen fertilizers", the first time can be sprinkled 25 kg / mu, and then can be sprinkled about 3 kg / mu per day, such as fermented egg duck feed fermented suckling pig feed (note that there can be no antibiotics in it) and so on can be put in the shrimp fry, instead of shrimp milk powder, the effect is better, mainly the shrimp fry have natural bait; this 15 days or so does not even need to feed professional shrimp milk powder or powder shrimp feed; the intestine is very strong;
Fermented fish sauce
Of course, we should pay attention to sprinkling yeast powder or photosynthetic bacterial culture liquid Oh, photosynthetic bacteria culture liquid can be 5 kg / mu, can be used every day (shrimp seedling stage); but the contradiction here is that the above "fermented nitrogen fertilizer" can also be cultivated at the same time, so, to observe the PH value, the daily measured PH value, PH value of more than 8.4, it is best not to exceed 8.2, it is necessary to use citric acid 5-15 kg / mu to sprinkle down, although citric acid is expensive, but also not wasted, later they are also the organic carbon source of the pond, At the same time, it has a strong detoxification effect, it is a high-quality edible organic acid detoxifier; if there is no citric acid, it can also be used to control the Ph value with a strong "fermented corn liquid" of 15-25 kg/mu;
It is best to have a small pond alone, with shading conditions, etc., specifically for the cultivation of zooplankton such as rotifers, etc., so that you can put "fermented fish sauce" or other "fermented nitrogen fertilizer" in a super dose of it. It is also easy to control the PH at about 8.0, after all, it is a small pond rich in eutrophication, do not put shrimp fry on no scruples, but there is one point: must ensure dissolved oxygen, there is no support of dissolved oxygen, bugs die quickly, so it is best to have an aeration plate (bottom oxygenation) or jet aerator, etc., to fully ensure dissolved oxygen, there is a large amount of reproduction, glucose or sugar is often supplemented;
After breeding a large number of rotifers, it can also be collected with simple equipment, such as using a suction pump, the outlet sleeve with a 200-purpose screen long bag, the water pump is placed in the pond where the insects are farmed, and the insects are continuously pumped into the net bags to filter out the bugs, cleaned, and then put into the breeding pond where the shrimp fry are placed, so this kind of single use of a small pond to breed rotifers, very good, no scruples, and can be regularly collected rotifers, quantitatively placed in the breeding pond, It is also possible to control excessively concentrated algae in the culture pond by means of bugs;
Cultivation of rotifers
Finally, to emphasize several major elements: first of all, it is necessary to use high-protein raw materials to be fermented later as nutrition for rotifers, such as "fermented fish sauce" is the best, followed by fermentation of various protein cakes, etc.; then one is to use photosynthetic bacteria or yeast powder to supplement special vitamins (this particularity is not available); second, strict control of the PH value is around 8.0 is the best; third, the sun can not be too strong, the water temperature can not be too high; the fourth is to use sugar to supplement energy, or use "fermented corn liquid" to supplement the carbon source, The PH value is also controlled; fifth, it is best to use a pond alone to specialize in the cultivation of rotifers, and regularly collect and use them;
Don't worry about the lack of rotifer eggs in the pond, as long as it meets the especially PH and temperature conditions, etc., and the nutritional protein is sufficient, it will grow;