What are the high-yield methods of releasing fry in fish ponds after the Beginning of Spring? Farmers remember these six points!

After the Beginning of Spring, many agricultural activities have to be prepared, and there may be delays under the influence of the epidemic, but what should be prepared should begin to be prepared. What are the high-yield methods of releasing fry in fish ponds after the Beginning of Spring? Farmers remember these six points!

I. empty pond and pond cleaning drugs for high-yield methods of releasing fry in fish ponds

Wild miscellaneous fish, tadpoles, frog eggs, water centipedes and other enemy organisms that may exist in the pond shall be removed with a dense mesh. In addition, fully dissolve the remaining pond cleaning drugs accumulated at the bottom of the pond to prevent the poisoning of fish fry.

2. the method of releasing fry in fish ponds to ensure sufficient dissolved oxygen in the water.

When throwing seedlings, pay attention to the weather forecast within three days, and avoid bad weather such as strong wind, cooling, overcast rain, thunderstorm and so on. The time of seedling release is inappropriate, which is easy to cause death, or the growth rate is slow in the future. In general, the stocking of fish species should be carried out at 9: 10 am on a sunny day, otherwise it is easy to cause stress death of fish fry.

III. Water temperature of transport bag and fish pond for high yield of fry release in fish ponds

The water temperature difference between the transport bag and the fish pond should not exceed 2 ℃. If the water temperature difference between the fish pond and the fish fry bag is too large, the temperature difference can be adjusted gradually until the fish fry are fully adapted before entering the pond. For splash seedlings transported in plastic bags, the opening of the plastic bag should be slowly placed into a pre-placed cage before entering the pond, and then the fish fry and water should be slowly poured into the box 30 minutes later. If the fry is supine after opening the bag, it can be judged as carbon dioxide poisoning, just put it in clear water for a period of time, after slow fry can return to normal.

4. selection of the position of fish fry under the pond for the method of releasing fry for high yield in fish pond

Related experiments show that the splash seedlings are poured directly into the water from a height of 30 cm, and the death rate is 5-10%; at a height of 60 cm from the water surface, the death rate is 20-30%. Therefore, the fish fry must be close to the surface of the water when entering the pond, slowly and gently. Don't worry to leave after the fry is released. Pay attention to observation. Wait for the fry to swim into the pond and disperse before leaving. If the fry gather densely, they can be sprinkled gently with water droplets to spread all over the pond.

5. The high-yield method of releasing fry in fish ponds should have enough to eat before entering the pond.

The practice of fish fry breeding shows that the fish fry should be fed with egg yolk or feed yeast once before entering the pond. If rotifers can be caught and fed, the survival rate or growth rate will be significantly improved. After the fish fry arrive, you can first feed the bait with a cage, and then re-count it into the pond.

VI. The high-yield method of releasing fry in fish ponds should not be fed on the day of release.

Within 30 days after planting, the bait should be fed more and less, and should be fed evenly along the edge of the pond as far as possible to ensure adequate feed and uniform feeding of fish fry; at the same time, pay attention to fine-tuning of water quality and prevention of diseases and insect pests. In general, the survival of fish fry tends to be stable after about 20 days.

As long as we do a good job in the preparation and later management of fish ponds, the survival rate and economic benefits of fish fry will be greatly improved.