Fry cultivation, also known as “powdered pondâ€, refers to raising the fry for 20 days to 25 days, and grows to about 3 centimeters, which is called “summer flowerâ€. The success or failure of fry cultivation directly affects the economic efficiency, but the fry generation rate in production has been very unstable. After years of practice and summary, the main reasons and solutions are summarized as follows:
The reasons affecting the rate of issuing ponds
The number of fish fry and the survival rate of transportation are one of the reasons that affect hair ponds. Some nursery units are greedy for profit, deliberately deducting the number of fry, and some are estimated to be under-sampled, rarely reaching 100%, and some are less than 70%, so this In fact, even if the other measures are perfect, it is difficult to meet the number of ponds and affect the rate of sending ponds.
One of the fry quality problems is to buy inferior seedlings; the second is to take outdated old seedlings. The rate of these two kinds of seedlings is very low.
Improper restocking is the key to affecting the rate of hair-feeding. Long-distance transport of fish fry is mostly carried out using nylon bags, oxygen, and automobile transportation. The water environment in nylon bags changes with the time after sealing. The first is the temperature. The outside interference after sealing the container is very small, and the temperature in the bag is slightly higher than the temperature due to decomposition of fish metabolites and fish breathing. This situation generally does not cause death in transit, but after reaching the destination, the water environment in the local fish ponds is very different from the quality of the water used for the transportation of fry. Therefore, if it is improperly stocked, it is easy to make fish ponds because of the sudden changes in the water environment. The survival rate has dropped, and even a large number of deaths have occurred. It is difficult to find small individuals because of the small number of fry. When water was not tested during stocking, the toxicity of the pool water did not disappear, which was also the reason for the low rate of fat ponds.
When the fish seedlings in the lower pond are affected by enemy organisms, they are often affected by the time when the fish is fed to the lower pond. The fertilization time is not enough to cause the other footpods to multiply in advance, and there are dragon larvae and pine algae, which can directly harm the fry or swallow the fry; The frog can not only directly butcher the fry, but also compete with the fish to fight for oxygen; the other is in the production practice, we found that there are a few fish ponds due to clear pond measures are not in place, there are many moss when the fish pond, the fry once entered It's hard to escape.
After three days of hatching of natural palatine feed, the endogenous nutrients basically disappeared and they began to feed on the artificial feed rotifers cultivated by the outside world. Therefore, there should be sufficient palatable natural foods in the nursery ponds when the fry hatches. Will lose weight in a short time.
The solution
1. Choose the honest and trustworthy field home to buy seedlings, when buying seedlings to be repeated several times to reduce the error value, to ensure that the number of seedlings taken, on the way to strengthen the management of transport, found that problems in a timely manner, such as long-distance transport, bagging into the bag when soluble Penicillin 400,000 units, to inhibit the oxygen consumption and metabolism of the fry in the bag to ensure the survival rate of transport.
2. After 4 days or 5 days of hatching, the fish has a strong ability to swim inflated and stocked with quality fish. 3. Before the fry in the pond, it is necessary to check whether the toxicity of the clear pond drug completely disappears. Inspection methods: (1) Put dozens of tailed seedlings into cages in the pond for half a day to one day to observe whether the fry activities are normal; (2) To test the pH value of the pool water, and to reduce the pH value to below 9 with quick lime, indicating that the toxicity has been Disappeared; (3) There was no helium in the observation pool, and there was a disappearance of toxicity.
4. In front of the fish ponds, use a dense mesh net to empty the pond 1 or 2 times to see if wild fish, frog eggs, aquatic insects, etc., are mixed in. If wild fish or enemy pests are found, clear ponds must be re-opened. Apes or scale insects, can be used 0.3ppm crystal trichlorfon Quanchiposa, and then Mushi 3.5 kg to 4.5 kg of urea fertilizer water, when the fish ponds, the fish penicillin with 100,000 units / 10,000 disinfection.
5. The temperature difference at the lower pond does not exceed 5°C. When stocking, put the bag in the pool for 10 minutes and wait for the temperature to be similar and then open. After opening, pour a small amount of water into the bag, and then grasp the bag and shake it a few times to mix the water with the water in the bag. After about 10 minutes Pour into the cage against the surface of the water, and feed a cooked egg yellow slurry for every 100,000 fry in front of the lower pond. When stocking, firstly, the fish should be swept out of the water at the tip of the pond, 1 meter away from the pool. Avoid plunge fish.
6. According to the principle of natural palatability in the pond and the adaptability of the growth of the fry in the development of the fry, the timely development of water quality, ensure that the rotifer peak during fry under the pond, fish rear pond feeding fertilizer, water quality regulation.
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