Traditional Culture Encyclopedia - Weather forecast - When the temperature drops, how to raise Penaeus vannamei to increase its benefits?
When the temperature drops, how to raise Penaeus vannamei to increase its benefits?
Pre-seedling treatment
Biological soaking ponds: Especially for earth ponds and sand-paved ponds, it is recommended to soak the ponds with 50 grams of biological oxidant per mu + 30 grams of biological water purifier. Fertilizer and hydroponic bacteria: Since the temperature of winter shrimp farming is low, the sunlight exposure time is short, and the photosynthesis of algae is weak, it is difficult to fertilize and water after the algae are poured out. Therefore, the fertilizer and hydroponic bacteria in the early stage are very important.
Recommended fertilizer and water plan
It is best to have an average water intake of more than 1.5 meters, which is beneficial to the stability of water quality after fertilizer and water. Immediately after the water enters, sprinkle 1 pack of zeolite powder per acre to purify the water quality and prevent The false water color may mislead judgment. After using the zeolite powder, use 1 bottle of Xiniodine 3 acres to eliminate harmful bacteria. 20 grams of biological water purifier per mu + monocystic algae nutrients (product types vary, use according to instructions) + 4-5 jin/mu of feed + 1 jin/mu of brown sugar. Add water and soak for 24-48 hours. It is best to oxygenate at the same time. . After soaking, add 200 grams of Bigreen per mu in the morning and pour it into the pond at the same time. After splashing, turn on the aerator. After 4-5 days, use Bilude to topdress again to maintain stable water quality and prevent water loss. (In addition, you can use a pack of 3 acres of Youcaile to maintain the water color.) 5-7 days after the topdressing water quality is stable, the seedlings can be released. On the day of release, 10 grams of biological water purifier can be added per mu. After fertilizing and watering, add 1 catties/acre of carbon source (glucose) every 3-4 days.
Water quality indicators
Guarantee pH at 7.8-8.3, no ammonia nitrogen, no nitrite, and transparency of 30-50 cm. Vibrio is within the safe range, green bacteria are less than 5 (especially Chlorovibrio, it is best not to have any), and yellow bacteria are within 30. When the water quality index reaches the above requirements, seedlings can be released.
Management one month after release of seedlings
The first 40 days or so of shrimp seedlings is a dangerous period. The causes are mostly caused by stress and excessive amounts of Vibrio. Therefore, it is very important to maintain water quality issues and improve shrimp stress resistance.
Nutrition and health care
Feeding method: Start feeding No. 0 feed (seedling size is more than 1 cm?) on the 2nd day after the seedlings are released. The day before feeding, per kilogram Soak the feed with 2g of biological water purifier + 2g of yeast + 10g of brown sugar + 500ml of water (until it is fluid) for 12-24 hours before feeding (cover the soaking process with a lid). During the soaking process, stir 3-5 times or add oxygen. Let the live bacteria and feed mix thoroughly. It is recommended to use all No. 0 feed and No. 1 feed stages. Supplementing minerals: During the 30-day period from the time of release, shrimp seedlings shed their shells more frequently and need to absorb a large amount of minerals. However, due to the lack of minerals in the water, it is recommended to sprinkle 100 instant supplements every 5 days. Usage: 200g/acre. Improve the anti-stress ability of shrimp: In the early stage, due to the small size of the seedlings, the shrimp seedlings have poor anti-stress ability and the weather is unstable.
Water quality maintenance
Supplement beneficial bacteria to maintain water color stability: It is recommended to use biological water purifier 20g/mu + powerful 50g/mu every 3-5 days. For high-level pools where conditions permit, it is recommended to use 20 g/mu of biological water purifier + 50 g/mu of biological oxidant every 3-5 days. Supplement beneficial bacteria to keep the water color stable: it is recommended to use 30 grams/mu of biological water purifier and 80 grams/mu of powerful biological water purifier. For high-level ponds where conditions permit, it is recommended to use 30 g/mu of biological water purifier + 80 g/mu of biological oxidant every 3-5 days, and at the same time, use 50 g/mu of powerful biomass source every 7 days. At the same time, the dosage should be appropriately increased or decreased according to changes in water color and food intake. Supplement trace element fertilizers to maintain the stability of the algae phase: It is recommended to supplement trace element fertilizers in time according to changes in water color, especially when the transparency becomes low and the algae phase is single. It is recommended to use 200 grams/acre of Bilude every 10-15 days.
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