The quality of shrimp seedlings is the key to determining the success or failure of shrimp farming. The easiest and most direct way to determine whether a shrimp is healthy is to fish for shrimps of different water layers to see if there are individuals with abnormalities, death, or lack of vitality. If this phenomenon occurs, it indicates that the shrimp seedlings in the pond have been diseased or ill. If such shrimps are purchased, the breeding may be completely failed, and the survival rate is greatly affected.
2. Shrimp seed purchase
Desalination: The salinity of the nursery is about 28‰, and the salinity of the shrimp pond on the farm is often lower than the salinity of the nursery. Therefore, the shrimp must be desalinated. The salinity of the pond is not lower than that of the nursery. In the process of desalination, it should be carried out gradually, and the salinity reduced every day should not exceed 1‰.
Counting: In order to ensure the number of shrimps, the purchase of shrimps should not be estimated, and should be counted one by one. When counting, a certain proportion of counts can be taken. For example, by estimating the number of shrimps, farmers often suffer large losses.
Transportation: When purchasing seedlings, buy as close as possible, and buy as much as possible from reputable units or individuals. Because of the recent purchase, it provides convenience for transportation and greatly reduces the risk of transportation.
Seedling density: Different culture objects have different seedling density. Taking the cultured prawn as an example, in the case of an aerator, it is appropriate to put 800-10000 tails per 1 mu of water.
Seedling time: Different cultured species, the time of seedling release is also different. Take the prawns as an example. When the seedlings are placed, the water temperature should be stable above 24 °C.
Seedling method: After the shrimps are transported to the shrimp pond, the bag should be immersed in water for 30 minutes to make the water temperature in the bag close to the pond. When releasing the seedlings, let the water slowly flow into the bag, and then slowly lift the bottom of the bag to allow the shrimp to swim slowly.
Shrimp Water Quality Problem
After 5 days of seedlings, start adding water to the shrimp pond. Add water once every 2 days, add 5 cm of water each time, until the shrimp pond reaches the water storage depth. The hot water in summer should be filled up. 1 day to 2 days before the rainstorm, the water is added to the upper limit of the water storage in the shrimp pond, so that the rainwater that falls naturally through the upper edge of the gate, preventing the rainwater from salting the shrimp pond, and the pH value is greatly reduced, affecting the growth of the shrimp or causing the dead shrimp.
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