Natural Propagation technique of Loach

Misgurnus anguillicaudatus, known as "the parameter in the water", has high breeding value. Natural reproduction refers to imitating natural environmental conditions under artificial control conditions, allowing Loach to lay eggs and hatch on its own. This method greatly improves the survival rate of Loach offspring, and the operation is also very simple. It is very suitable for professional households of Loach breeding. Let's take a look at the natural reproduction technology of Loach.

Breeding habits of Loach

Misgurnus anguillicaudatus lives in static or slow water at the bottom of the silt, and has strong adaptability. It can live in an environment rich in humus. It often comes out at night to prey on plankton, aquatic insects, crustaceans, aquatic higher plant debris and algae, and sometimes takes water bottom humus or sludge. It develops and matures at the age of 2, and begins to reproduce in April every year (water temperature 18 ℃). The eggs are laid in the shallow grass with a water depth of less than 30 cm, and the eggs are attached to the water grass or the submerged dry grass. The hatched larvae often live separately and do not form groups.

Spawning technique of Misgurnus anguillicaudatus

1, spawning environment: Misgurnus anguillicaudatus spawning pond can choose small cement pond, small pond and so on, the water surface is 5102m, the water depth is 4050cm, it is best to keep micro-running water. Put aquatic plants, willow roots and palm bark in the spawning pond to make fish nests for eggs to attach. The parents of Loach were placed in 710 groups per square meter (one female and two males as one group).

2. Spawning time: when the water temperature is 18: 20 ℃, it usually lays eggs in the early morning or before 10:00 on a sunny day, and usually lays eggs after rain or midnight when the water temperature is 20: 28 ℃. A female Misgurnus anguillicaudatus can lay 200 eggs and 300 eggs at one time, and can only be finished after laying eggs for many times, producing a total of 3000 eggs. Fertilized eggs adhere to the fish nest, but the adhesion is poor, it is easy to fall off, so the operation should be careful.

3. Spawning management: during the spawning period, the fish nest is fished out every morning for observation. If there are more eggs on the fish nest, it should be moved to the hatching pond and put back into the fish nest in the afternoon. If the fish nest is not collected in time, the fertilized eggs will be eaten by the parent Loach. The parent Loach culture pond can also be used as the spawning pool. When the water temperature rises to 18 ℃ and individual Loach chase, put it into the fish nest and keep micro-running water in the pond, which can improve the water quality and stimulate the reproduction of Loach.

Hatching technique of Loach

1. Seedling pond arrangement: the fertilized eggs of Misgurnus anguillicaudatus are often hatched in the seedling pond. Clean up the nursery pond 10-15 days before the fish nest is put in. In order to improve the hatching rate, the net frame can be set up 20 cm underwater in the hatching pool (nursery pond), and the fish nest can be laid flat on it. About 10,000 Loach eggs are released per square meter, and the emergence rate of fertilized eggs is usually 40%. Based on this, the total number of eggs released was calculated.

2. Seedling pond management: the top of Loach nest should be shaded to avoid direct sunlight, and at the same time prevent frogs and wild miscellaneous fish from entering the pond to harm Loach eggs and seedlings. In the whole hatching process, we should observe diligently and fish the frog eggs and dirt out of the pond in time. When the water temperature is 19 ℃, the fertilized eggs can hatch Loach seedlings after about 50 hours.

3. Management of Loach seedlings: the newly hatched Loach seedlings are 3-4 cm long, with a large yolk sac and outer Gill, with a head bent to the abdomen. Lying on the side underwater or attached to the fish nest, little activity, relying entirely on yolk sac to provide nutrition. After 2 days of hatching, the body color deepened and the yolk sac shrunk. Three days after hatching, the body color of Loach became black, the yolk sac disappeared, the swim bladder appeared, the pectoral fin became larger, could swim in parallel for a short distance, and began to feed. At this point, feed hard-boiled egg yolk or soy milk.

Points for attention in breeding Misgurnus anguillicaudatus

The main results are as follows: 1. The hatching temperature is closely related to the fertilization rate and hatching rate. When the water temperature is lower than 20 ℃ or higher than 30 ℃, the fertilization rate and hatching rate are lower, so the best time for hatching is 22-28 ℃.

2. When all the fertilized eggs break the membrane, the egg membrane and dirt should be fished out quickly and timely, so as to avoid deterioration of water quality caused by corruption and affect the survival rate of seedlings.

3. during the seedling cultivation, the aerator is turned on regularly or new water is injected. Loach seedlings breathe completely on the dissolved oxygen in the water before the camp intestinal respiration and skin respiration, which is different from the adult Loach, so as to avoid the death of floating head caused by hypoxia in the water. About 15 days after Loach seedlings went into the pond, the intestinal respiratory organs could be initially formed, but it was not perfect.

4. When the Misgurnus anguillicaudatus seedlings go into the pond, it is best to adjust the water temperature of the pond with that of the hatching pond to avoid unnecessary losses caused by excessive temperature difference.

5. The most common fish diseases in the process of Loach seedling cultivation are air bubble disease and Gill rot disease. Gill rot disease mostly occurs in the pond of Loach seedlings for about 12 days, so chlorine dioxide is used to disinfect the water body for prevention in advance. On the other hand, the bubble disease appeared on the same day when the Loach seedlings went to the pond. When the disease was found, the well water should be injected in time, and the whole pool should be sprinkled with 10-15 kilograms of salt per mu.

6. After the seedlings of Loach grow to 3-5 cm, the ponds should be divided into 10-150000 seedlings per mu.

7. The Misgurnus anguillicaudatus seedlings bred in May of that year can reach the commercial specification of about 60-80 fish / kg after about 5 months of culture because of the short growth period, fast growth and low feed coefficient.