"Prevention of stress in splash fry"
If the pH is too low, the fry will not be stressed, which is not conducive to the recovery of the fry's constitution, and it is easy to develop. It can be adjusted to the normal range with lime; if the pH is slightly higher, it can be 8.0 to 8.5, and it can be passed through cattle, sheep droppings or sugars. Even roughage and so on. The decomposition of organic matter releases carbon dioxide, which also has a fertilizer effect. If the pH is too high, in the morning above 8.5, it is necessary to adjust with acetic acid in advance.
The steps are as follows: (1) Measure the amount. 200 liters of pond water in a large bucket, add 2 drops of acetic acid (about 0.1 ml, ie 0.5 ppm) with a pipette, and measure the pH after stirring. If it is still high, continue 2 drops until the pH is 7.3-7.6 and calculate the amount of acetic acid. . Care must be taken not to exceed 4ppm. If the amount is too large, it will cause a long-term lack of oxygen in the water body, and the ammonia nitrogen and sub-salt will rise. It also indicates that the water is poured into the water too soon after the lime pond is prepared.
(2) According to the total amount, several times sprinkling, turn on the aerator to stir, 2 hours after each sprinkling, Quantang measured the pH in all directions, such as the upper layer of water, the lower layer of water and the surrounding water, to judge the pH more scientifically. It also prevents calculations from being inaccurate.
(3) If the amount is not enough, it can be repeated. In short, it takes some time to prepare. Due to differences in different pipettes, it is also possible to first detect how many drops of water are 1 millimetre, and generally 20 to 25 drops. If the transport distance is very short, or if the pH value in the bag when the seedlings are placed is 6.8 or more, the fishpond pH will not be stressed even if it reaches 9.0.
1. There must be someone to guide the seedlings. When fish fry go to Tongtou, it is necessary to confirm that the pond pH is in the normal range.
2. Take two bags of fry, open the bag against the water and circle the bag so that the bag floats on the water. (If the fishpond pH is in the normal range, the pH after being filled with water is about 6.8-7.0, and the seedlings will not be stressed in the bag; but if the pH of the fishpond is too high, it is necessary to test one side against the other to ensure bagging. The pH of the internal water should not exceed 7.5, otherwise watering too much and stress within the watering bag). If the stress in the watering bag indicates that the fish is too long or the packing density is too high, the carbon dioxide in the bag is too high, the fish status is extremely poor (the redness of the fish), or the pH of the fish pond is too high to be suitable. Investment seedlings. In case of such a situation, it is necessary to contact the relevant personnel in a timely manner. The first is to find a cause and the second is to discuss rescue measures.
3. Put Miao test water. The water adaption time of the seedling bag is based on the lack of oxygen. Generally, the water spray takes about 1 hour, and the fry is about 30 minutes. The more the water is exchanged, the longer it can be adapted. After watering for a certain period of time, put 1 bag of seedlings into the fish pond and observe for 5 minutes to 10 minutes to see if there is any stress. The earlier the stress is, the more dangerous it is. If there is a small amount of stress after 10 minutes, the relationship is small and it will recover.
4. Determine the watering time. If there is a small amount of stress in the first bag seedlings, extend the time for the second bag seedlings to water, and repeat step 4 to determine the time for watering. However, it should be noted that there should be no oxygen deficiency during the watering process.
5. Guidance on unloading seedlings. While performing the third step, instruct the unloading of the seedlings to allow the seedlings to float on the water surface to reduce the temperature difference. After the third step is safe, instruct the employees to divert water and methods; after the safety of the fourth or fifth step, guide the employees according to the sequence and Time put seedlings.
6. Disinfection. The bleaching powder was used to disinfect the seeds 1 to 2 days before the low-temperature seedlings were transplanted. After the seedlings were placed, they were disinfected with povidone-iodine, especially for the stressed seedlings ponds. Dosage reference instructions.
7. Irregular treatment and its hidden dangers: Because it is too late to adjust the pH value (many farmers do not pay attention), when the first bag seedlings have strong stress, they should promptly use acetic acid (or stress agent, its composition is acetic acid or other organic acids ) Spill. However, due to the rush of time, it is difficult to splash evenly, and the pH of some areas is extremely low, which can lead to abnormal fish fry.
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