Shrimp farmers how to choose seedlings

In May, the cultivation of Penaeus vannamei in outer ponds began one after another. The first step was to select good shrimps, and then put them in the right way, and then use some drugs to preserve the seedlings. We all attach great importance to these operations, and we do not want to lose our own shrimps at the starting line. Before the investment, the first thing is to clean the pond correctly and completely. When using the medicine, follow the order of “killing before, eliminating and eliminating the last” and the pond clearing method of Mantang Water. After clear ponds, there must be "targeted" detoxification. After the detoxification is complete, the fertilizer is selected according to the criteria of “multi-carbon and polysulfide ore, less nitrogen, less phosphorus, and less dirt”. However, many operations have been ignored or mistaken, which will directly affect the future survival rate and growth rate of shrimp. The author through the finishing of practical experience, and share with you, hoping to provide assistance for aquaculture production.

How to choose shrimp

(1) Whether it is a generation of seedlings, second-generation seedlings, earth seedlings, or breeding seedlings, first select a shrimp with good reputation, guaranteed brand, and stable quality.

(2) After entering the nursery workshop, judge the water quality and shrimp condition by smelling. The presence of odor or ammonia may be a result of deterioration of the water quality or excess material.

(3) Observe the foam on the water surface to determine the size of the foam. It is recommended to select the seedlings in the seedling pool that are mainly small foam. The big bubble is because the water body is sticky, there are many residual bait and ammonia nitrogen is high.

(4) See if the size of shrimp seedlings is the same. Size and size are not uniform, and there is no serious polarization to good seedlings. If small seedlings are eliminated, there are problems in the management of nursery.

(5) Observe the fullness of the intestine, no jejunum, no heartbroken and dragged feces, microscopic observation of food, strong motility as a good seedling.

(6) Observe under the microscope that the high-quality shrimp seedlings have a clean body surface, no hanging dirt, and no ciliates. The greater the bifurcation of the eyelid, the better. The tail fan spreads out, like a fan.

(7) When the seedlings are tested, observe the survival status of the shrimps in the barrels: The high quality shrimps generally live in the bottom of the test barrels and do not float on the water.

(8) Measuring the water quality of the seedling farm: The pH value is normal, and the daily variation range is not a good seedling; no ammonia nitrogen, sub-salt, heavy metal and other harmful substances are good seedlings.

(9) Do not choose high temperature seedlings.

(10) Prawlings that fade too fast are not preferred. (11) Top seedling water test: The seedlings are put into white bowls or white porcelain bowls, and the water is vigorously agitated. The top water is obviously as good as possible.

(12) When the high-quality shrimp seedlings were examined by autopsy, the frequency of heart beats was uniform, and there were no red spots at the foot-foot joints. Hepatopancreas compressed tablets, fat particles of uniform size and distribution.

Fertilizer water and seedlings

Disadvantages of clear water seedlings:

(1) In Wai Tang, the water has high transparency and is easy to grow moss.

(2) In the outer pond culture, the water quality is easily affected by weather changes, water quality is unstable, and the probability of “bubble disease” and stress response increases.

(3) There is a lack of food organisms in the water body, and oxygen and bait feed are insufficient, which can easily cause oxygen deficiency and swimming ponds.

(4) The biological characteristics of shrimp are not like strong light. Clear water will affect the normal physiological activities and feeding of shrimp.

(5) A large amount of organic matter accumulates, and problems occur in the nitrogen cycle of water bodies, which will gradually produce toxic and harmful substances such as ammonia nitrogen and nitrite.

(6) The self-purification capacity of the water body is poor, and the water is easy to make. (7) Greenhouse culture, poor water insulation performance.

(8) Greenhouse cultivation, early water aquaculture, and waterborne fertilizer in the middle and later stages.

The advantages of fertilizer and water seedlings:

(1) The balance between algae and bacteria phases enhances the stability of the water and stabilizes the pH.

(2) Warming can be facilitated during greenhouse cultivation.

(3) Increase the self-purification capacity of the water body, increase the permeability of the water body, and eliminate the phenomenon of blisters and water stickiness.

(4) Culture bait organisms and reduce the bait coefficient. (5) Algae can produce large amounts of oxygen.

(6) White shrimp does not like strong light, and it can shave after fertilizer and water.

Precautions when stocking shrimp

(1) In order to ensure the safety of the shrimp into the pond, a small amount of shrimp should be placed in the test seedling net (bottomless cage) to perform a “water test” to observe whether abnormal behavior (such as yoguration, paralysis) occurs within 24 hours. Jumping, sinking, dying, etc.) The survival rate of shrimps is determined to be above 95% and stocking of shrimps is determined.

(2) Before and after the emergence of the seedlings, it is necessary to ensure that the quality of the water quality does not change much. It is best to ensure that the water quality indicators of the pond are equivalent to those of the original pond, and the pH values ​​of ammonia nitrogen, nitrite, and residual chlorine do not exceed 0.2, and the salinity does not exceed 1 degree. Temperature control up and down no more than 2 °C.

(3) The seedlings should be selected between 7:00 am and 9:00 am, and the pool water temperature should be above 22°C. It is recommended that the first time for open ponds to be planted before and after Qingming, and the second for no later than one week after Liqiu.

(4) When strong winds, heavy rain, and high temperatures at noon should not be allowed to plant seedlings, the temperature should be moderate and sunny.

(5) When laying seedlings, the seedlings should be planted before the peak period of branches and branches, because the food intake for the horns is very small, avoiding the excessive number of branches and corners caused by the water quality is thin and cause water body hypoxia.

(6) Before the official release of the seedlings, the oxygen bag containing shrimp shall be floated on the surface of the shrimp pond for about 30 minutes so that the water temperature inside and outside the bag will be the same. Then open the shrimp bag and slowly add water to the bag until the water overflows. Slowly pour the shrimp into water.

(7) The place where the seedlings are to be planted should be in the upper wind position where the pool water is deep. The better the weather, the more beautiful the color of the water; the land of moss is more, the plants are more, and the transparency is greater; recently the use of chemical fertilizers, fertilizers, etc., is recommended to put the seedlings on the south bank (backside surface), deep water area or cloudy day when the seedlings are released.

(8) Keep the seedlings as far as possible to avoid the solar term or tidal period (before and after the third and eighth lunar calendars).

(9) The fertilizer water is released and the pond water level is deeper.

(10) Try to use the feed (shrimp) used in the seedlings, and use it with “aquaculture and stomach yeast”.

Keeping seedlings and daily management

Before putting on the seedlings for 1 hour, “Extraordinary 99 + Good + Carrefour” was disinfected and anti-stressed. If there is ammonia nitrogen, nitrite, use of the composite nitrifying bacteria "Nitrosacterium" for treatment. The shrimps were brought back and the “shrimp bag” was placed in the tank for 10 minutes to 15 minutes to adapt to the water temperature in the pool, and the bags were then unpacked. On the second day, the "prestige 99 + good + more + Carrefour" was used again to maintain the seedlings and increase the survival rate.

(1) The daily pH value is strictly controlled under 8.6. If it is too high, appropriate amount of "biocide bacteria" can be added during the seasoning.

(2) The holding tank temperature is controlled at about 28°C, and the change from top to bottom does not exceed 2°C. If the temperature is too high or too low, adjust the temperature using the method of entering and leaving the water, or use "good underwater poison net" to cool and stabilize the water.

(3) Use Supreme 99 every 2 days to prevent secondary infection due to frequent clam shells.

(4) Observe the body color and the intestinal tract of the shrimps in white porcelain bowls on a daily basis. The intestines are black and their body color is white and transparent. If there is a shrimp on the surface of the water and there is a phenomenon of defecation, use the “Extreme 99 + good C100 + green power + Carrefour” Quanchiposa, two consecutive times.

(5) After releasing the seedlings for 4 days to 5 days, the foam on the water surface will gradually increase due to the slow metabolism and conversion of the waste manure bait and the gradual increase of ammonia nitrogen. During the entire period of dilution, the water quality was checked every day and ammonia nitrogen and nitrite were strictly controlled. Once every two days, a compound nitrifying bacteria is used, ie "Nitrogenated bacteria."

(6) It is forbidden to use excessively irritating drugs such as chemical water transfer agents, antibiotics, and oxidants. When dealing with problems, try to use biologics and drugs that are less irritating to reduce the loss of shrimp seedlings.

(7) will increase oxygen. Outer ponds are farmed and no aerators are opened at noon on sunny days when the water surface temperature is too high. Temperature shed breeding, it is recommended that "more gas, weak oxygenation, small bubbles."

(8) Balance the focus on the shell. During the oyster shell, the ingredients are used internally to “fisherman’s love” or “galef”.

(9) "Fewer meals", heavy nutrition, heavy oral administration, liver protection, gallbladder, anti-enteritis, promote digestion. Frequent mixing and internal treatment: good and more + Carrefour + green power + appetizer to promote long + good liver and gallbladder.

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