CATDOLL : CATDOLL: How to artificially breed loach

1. How to artificially breed loach

Artificial propagation of loach

1. Artificial induction of labor

(1) Selection of broodstock for induced spawning. When the water temperature reaches about 22°C, select female fish with a swollen, full, soft and elastic abdomen, with the outline of the ovaries visible when the abdomen is facing upwards, and with obvious ribs when the abdomen is touched by hand. The female fish are healthy and free of disease and injury, and the male fish with a rough feeling on the pectoral fins when the hand is touched for induced spawning.

(2) Oxytocics and their use. Oxytocics include chorionic gonadotropin, luteinizing hormone-releasing hormone analogue A2, etc. The dosage for single use is: HCG 5IU/g~10IU/g, LHRH~A2 0.01μg/g~0.02μg/g; the dosage for mixed use is DOM 0.003mg/g~0.005mg/g + LHRH~A2 0.005μg/g. The male fish is halved. The injection method is a single injection. The oxytocics are diluted with 0.9% saline and used immediately. The amount of the liquid is prepared at 0.2mL per fish. The injection site is the back muscle. The needle is at a 45-degree angle to the fish body. The needle insertion depth is 0.3cm~0.4cm. After the injection, the broodstock are placed in the net cage.

2. What should be fed when feeding loach artificially?

Artificial breeding technology of loach.

It may be helpful for you to raise loaches.

The breeding pond should be constructed in a place with good lighting, warm ventilation, convenient transportation, sufficient water source, convenient water supply and drainage, and no pollution source within 3 kilometers. The soil of the loach breeding pond is neutral or slightly acidic clay soil. The area is 100-300 square meters, the pond depth is 80-100 cm, and the water depth is 30-50 cm. Cleaning and disinfecting the pond Use quicklime to clean and disinfect the pond 15 days before the loach is released. Leave the pond water 10 cm deep, and use 100 grams of quicklime per square meter to dissolve the water and sprinkle the whole pond. Before releasing the seedlings, soak and disinfect the loach with 3% salt water for 10 minutes. Choose a sunny day at noon and release 50-60 loach species with a body length of 3-4 cm per square meter. Feed feeding Loach has a miscellaneous diet, and small animals, plants, microorganisms and organic debris in the water are all its favorite foods. Artificial breeding should also feed maggots, earthworms, small fish meat, mussel meat, fish meal, livestock and poultry scraps and other animal feeds and wheat bran, rice bran, bean dregs, cakes and other plant feeds. Feed at regular times, fixed locations, fixed quality and fixed quantity. The amount of feeding depends on the water quality, weather and feeding conditions. When the water temperature is suitable, feed once in the morning, noon and evening every day. When the water temperature is low, feed once in the morning and afternoon every day. The percentage of feeding amount to the body weight of loaches in the pond: March, 1% to 2%; April to June, 3% to 5%; July to August, 10% to 15%; September, 4%. The proportion of plant feed and animal feed under different water temperature conditions: when the water temperature is lower than 10℃ or higher than 30℃, feed less or no feed; when the water temperature is 11-20℃, plant feed accounts for 60%-70%, and animal feed accounts for 30%-40%; when the water temperature is 21-23℃, plant feed and animal feed each account for 50%; when the water temperature is 24-29℃, plant feed accounts for 30%-40%, and animal feed accounts for 60%-70%. Water quality management After the loach is released, topdressing should be done in time according to the water quality, and plankton should be cultivated to keep the water body in a lively and refreshing state. When the water temperature reaches 30℃, replace the water with new water in time and increase the depth to lower the water temperature and prevent floating. When loach is found to often swim to the surface of the water to swallow air, it indicates that there is a lack of oxygen in the water. Fertilization should be stopped and new water should be injected immediately. During the winter, from December to February of the following year, no feeding is required. Instead, the pond water depth should be increased and pig and cow manure should be placed in the corners of the pond to raise the water temperature and ensure the safety of the loach during the winter. Daily management: Patrol the pond once in the morning and evening to check the activities, eating, diseases, etc. of the loach. At the same time, observe whether the breeding pond has water leakage and whether the loach has escaped. The cement pond should remove residual feed every day and keep daily records.

3. How to artificially breed loach

First of all, we need to understand the reverse method of loach. Loach has strong adaptability to the environment and a wide range of feed sources. It can be raised in ponds and rice fields, making it a good project for rural family breeding.

Loaches naturally lay eggs for a long time, usually from April to August every year, from late May to late June, when the water temperature reaches about 20-25℃, which is the peak period for spawning. The loaches used for breeding should be over two years old, mature, strong, and disease-free. Female loaches should preferably be selected with a body length of more than 15 cm, a weight of more than 20 grams, a swollen abdomen, and wide pectoral fins with rounded front ends; male loaches should be selected with a body length and weight slightly smaller than female loaches, and narrow pectoral fins with pointed front ends.

4. How to raise loaches in ponds

The breeding pond should be built in a place with good lighting, warm and ventilated, convenient transportation, sufficient water source, convenient water supply and drainage, and no pollution source within 3 kilometers. The soil of the loach breeding pond is neutral or slightly acidic clay soil. The area is 100 to 300 square meters, the pond depth is 80 to 100 centimeters, and the water depth is 30 to 50 centimeters.

Clean and disinfect the pond 15 days before stocking the loach fingerlings. Leave the pond water 10 cm deep and sprinkle 100 g of quicklime per square meter in water throughout the pond.

Before stocking the seedlings, soak them in 3% salt water for 10 minutes for disinfection. Choose a sunny day at noon and release 50 to 60 loaches with a body length of 3 to 4 cm per square meter.

Feeding: Loaches have a mediocre diet, and they like small animals, plants, microorganisms, and organic debris in the water. Artificial feeding should also be fed with animal feeds such as maggots, earthworms, small fish meat, mussel meat, fish meal, livestock and poultry scraps, and plant feeds such as wheat bran, rice bran, bean dregs, and cake meal.

Feed at fixed time, fixed place, fixed quality and fixed quantity. The feeding amount depends on water quality, weather and feeding conditions. When the water temperature is suitable, feed once in the morning, noon and evening every day. When the water temperature is low, feed once in the morning and afternoon every day. The feeding amount as a percentage of the body weight of loaches in the pond: in March, 1% to 2%; in April to June, 3% to 5%; in July to August, 10% to 15%; in September, 4%. The feeding ratio of plant feed and animal feed under different water temperature conditions: when the water temperature is lower than 10℃ or higher than 30℃, feed less or no feed; when the water temperature is 11-20℃, plant feed accounts for 60% to 70%, and animal feed accounts for 30% to 40%; when the water temperature is 21-23℃, plant feed and animal feed each account for 50%; when the water temperature is 24-29℃, plant feed accounts for 30% to 40%, and animal feed accounts for 60% to 70%.

Water quality management After the loach is released, topdressing should be done in time according to the water quality, and plankton should be cultivated to keep the water body active and refreshing. When the water temperature reaches 30℃, replace the water with new water in time and increase the depth to lower the water temperature and prevent floating. If loach is found to swim to the surface of the water to swallow air frequently, it indicates that there is a lack of oxygen in the water. Fertilization should be stopped and new water should be injected immediately. In the wintering season, from December to February of the following year, no feeding is required. Only the depth of the pond water should be increased and pig and cow manure should be put in the corners of the pond to increase the water temperature and ensure the safety of loach overwintering.

For daily management, patrol the pond once in the morning and once in the evening to check the activities, eating, diseases, etc. of the loaches. At the same time, observe whether there is water leakage in the breeding pond and whether the loaches have escaped. The residual feed in the cement pond should be removed every day, and daily records should be kept.

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Artificial breeding of loach

Category: Other practical technologies/breeding Scope of application: Unlimited

(1) Raising loaches in special ponds. This is a breeding method generally adopted by producers who specialize in loach breeding. It is best to have a mud bottom in the pond. If it is a cement pond, the soil should be 15-20 cm deep. The area of ​​the pond should not be too large, about one mu is appropriate, and 50,000 to 100,000 young seedlings 3-4 cm long can be placed per mu. Before stocking the seedlings, base fertilizer should be spread, mainly organic fertilizer, to cultivate a large number of zooplankton as bait for loach. After stocking the seedlings, gradually increase the feeding of feed and apply organic fertilizer. The main types of bait fed include rice bran, bean cake, bran, bean dregs, silkworm pupa powder, earthworms and food processing waste. Fertilizers include human and livestock manure, crop straw compost, etc. If the water temperature is higher than 30℃ or lower than 10℃, the amount of feed should be reduced. Generally, it can be caught after 8-10 months of breeding, and the high yield can reach 250-400 kg per mu. Each tail is about 15 cm long and weighs 10-15 grams, meeting commercial specifications.

(2) Raising loaches in rice fields. Raising loaches in rice fields can use natural bait organisms such as earthworms, chironomid larvae, water fleas and weeds in the fields. By feeding a small amount of feed, good economic benefits can be achieved. Because loaches are strong in vitality, they can burrow into wet mud and use their intestines and skin to breathe to maintain their lives even when the rice fields are drained and dried. Therefore, loaches are one of the ideal objects for rice field farming. The construction of rice fields is the same as raising other fish. One or more fish ponds are dug in the fields, with an area of ​​2-3 square meters and a depth of about 50 cm. The fish ponds are connected to the fish ditches, and the fish ditches are opened in the shape of a "field" or "well". Fish interception facilities should be set up at the inlets and outlets to prevent escape. 15,000 to 20,000 loach fry about 3 cm long are released per mu of rice field. Be careful to avoid using lime and pesticides, feed and fertilize appropriately, and catch them after the rice harvest in autumn, or continue to raise them after flooding. They can be caught and put on the market when the fields are plowed in the spring of the following year. Generally, 30-50 kilograms of loaches can be harvested from every acre of rice field.

In addition, a certain number of loaches can be raised in the water surface where lotus roots, lotus, wild rice stems and other aquatic plants are planted. Generally, about 1,000 loaches are raised per mu. As long as the breeding and management are proper, the income from the water surface can be increased.

(3) Raising loaches at home. This means raising loaches in pits and reservoirs in front of and behind houses or in vegetable gardens. Generally, 4,000 to 5,000 young fish 3 to 4 cm long can be released per mu. They can also be mixed with yellow mullet and carp. Pay attention to feeding and fertilizing at ordinary times, such as leftovers, livestock and poultry manure, vegetable leaves, etc. Feeds should be a combination of plant and animal. At the same time, control the water quality. When loaches are found to jump out of the water to "swallow air", it means that there is a lack of oxygen in the water body. Fertilization should be stopped and new water should be replaced. When loaches grow to 15 to 20 cm, they can be caught and put on the market. After 8 to 10 months of breeding, the yield per mu can reach more than 100 kg.