What are the key points of mandarin fish seed cultivation technology, can you give an example?

The first is the selection of fish pond mouths. The fish pond should be leeward and sunny, with little or no sediment, convenient drainage and irrigation, sufficient water source, good water quality, fresh and pollution-free. According to the need, the breeding pond should be equipped with the corresponding bait fish pond, the bait fish should be selected from a wide source of seedlings, easy to feed, fast growth, high yield, convenient rotation, fresh, palatable size, no hard thorns, and timely.

Selection of broodstock Broodstock need to choose robust, disease-free, pain-free species, male fish choose 2-3 years old broodstock, female fish choose 2-3 years old, the ratio of male to female can be.

Artificial induced spawning The artificial induced spawning season of mandarin fish is generally from April to September in many areas, and after the male and female fish can be injected with oxytocic hormone, when the water temperature is 24-28, the female will start spawning after about 24 hours.

The culture cycle of mandarin fish is mainly divided into the fry cultivation stage, the fingerling cultivation stage and the adult fish cultivation stage. Seedling stage: artificial induction, artificial incubation.

Seed cultivation stage: After the mandarin fish fry are separated from the membrane, the egg membrane and dead eggs and other dirt should be screened with a sieve first, and then cultured in different ponds according to the size of the mandarin fish fry. Grow-out stage:

Reasonable feeding, control stocking density, and actively prevent diseases.

Three-stage breeding technology of mandarin fish cycle nursery, seed cultivation and adult fish cultivation.

First, the cultivation stage of mandarin fish fry.

The environment in which mandarin fish fry are reared is very important. The water quality of the fish pond should be light and not turbid, and some submerged aquatic plants should be placed at the bottom of the pond. Acidic ponds and turbid pond water cannot be used to raise mandarin fish fry.

Before putting in the mandarin fish fry, the fish pond should be disinfected, and then some culture water can be put in to raise the bait fish.

Three-stage breeding technology of mandarin fish cycle nursery, seed cultivation and adult fish cultivation.

Second, the seedling stage.

For artificial induction and artificial incubation, the cycle of artificial induction is generally from April to September, and the dosage of labor induction drugs should be determined according to different weather, water quality and moisture. Pay special attention to the water temperature when incubating. Water quality requires sufficient oxygen content, and the water flow speed should be maintained at 1-2 meters per second.

Newly hatched mandarin fish fry are only about 4 mm long and can grow to about 30 mm after artificial breeding.

Three-stage breeding technology of mandarin fish cycle nursery, seed cultivation and adult fish cultivation.

Three. Fingerling rearing stage.

After the mandarin fish fry are separated from the membrane, the egg membrane and dead eggs should be screened out with a sieve, and the fry at this stage can only move up and down, and cannot swim in parallel. Therefore, live fish that have just been released from the membrane should be prepared to be used as forage fish, such as Thai mackerel and wheat mackerel. It is necessary to change the water daily to disinfect and keep the ponds clean, preferably with coarse salt and dibromohydantoin as disinfectants.

Mandarin fish fry should be reared in separate ponds according to their size. In about 12 days, the length of the mandarin fish fry can grow to about 4 cm. At this time, it is necessary to classify and sell mandarin fish fry under 4 cm.

Three-stage breeding technology of mandarin fish cycle nursery, seed cultivation and adult fish cultivation.

Four. Commercial mandarin fish farming.

Commercial mandarin fish culture focuses on feed management, stocking density and disease prevention. Mandarin fish is a carnivorous fish, so prepare some mayflies such as small fish and shrimp. However, in order for mandarin fish to grow more comprehensively, some feed should be given in moderation.

However, every time the feed is put in, the leftover feed from the last feeding must be fished out to prevent the mandarin fish from eating and contracting diseases caused by rotting in the pond.

Three-stage breeding technology of mandarin fish cycle nursery, seed cultivation and adult fish cultivation.

Verbs (abbreviation for verb) are suggested.

Mandarin fish have a strong ability to reach Hangzhou and generally do not get sick. However, there will be a large number of parasites and bacteria in the breeding process, so it is necessary to disinfect the pond regularly to ensure that the bacteria in the fish pond are cleaned and prevent mandarin fish from getting sick. The density of mandarin fish farming is also a key point in determining the survival rate of mandarin fish.

Generally, only 1000-2000 acres of fish fry can be placed in one acre of pond. If there are too many fry, it will be difficult to manage, which will cause the fry to die, so the number of mandarin fish per mu should also be controlled within a certain range.

To the water quality requirements are relatively high, in the process of fish fry culture, because of the attention to the shortcomings of not easy to discharge, to prevent the precipitation of silt and humus, at the same time to continue to maintain sufficient dissolved oxygen, in the culture to continuously add new water, in accordance with the food standard, timely and palatable, the appropriate amount of bait, the water quality should also be clear, stocked in a cage of fish fry degree of seven or eight mm per box stocking, the key to cage culture fish is to maintain clean water quality and sufficient amount of fish.

When raising mandarin fish, there should be sufficient water sources, away from harmful places, such as factories, to avoid harmful substances flowing into the fish pond, and the drainage and irrigation of the fish pond should be convenient, so as to provide a better growth environment for the mandarin fish, and there should be no silt in the fish pond.

Attention should be paid to water quality, water pollution, the temperature of their environment, the intake of oxygen, and the disinfection of the pool to avoid the spread of bacteria, all of which will affect the reproduction and normal growth of mandarin fish fry.

Be sure to choose the species of fry and be sure to feed the fry. And to prevent the occurrence of bubble disease, it is necessary to clean the sewage in time.

The type of fry must be selected, and the fry must be fed. And to prevent the occurrence of bubble disease, to clean the sewage in time.

Be sure to choose high-quality varieties, and then you should also understand the growth cycle of this plant, you also need to choose high-quality feed, you need to change the water source regularly, and you also need to keep the oxygen in the water sufficient, so as to improve the survival rate of planting.

The living environment of live mandarin fish is very demanding, the water quality should be fresh, the nutrition should be rich, and the amount of bait for feeding mandarin fish is very large, and the fry is best to choose the breeding of natural water fishing, so as to ensure the quality and quantity of mandarin fish.

The water source of aquaculture should be sufficient, away from the polluted area, the water quality of the water source should be guaranteed, the water temperature should not be too high or too low, choose the live water fish pond, the fish pond should have a certain amount of flowing water, can not be stagnant water.

Since the 90s of the 20th century, the cultivation technology of mandarin fish fry has been continuously improved and enhanced, and the cultivation methods and methods are also diverse, and the production is summarized into two methods: flowing water and still water cultivation. Flowing water seedlings are divided into loops and hatching tanks; Still-water seedlings are divided into cement ponds, small ponds, cage cultivation and small earthen pond seedlings. The survival rate of flowing water seedlings was higher than that of still water seedlings, but the growth rate was slightly slower than that of still water.

Production is often carried out in a combination of two or more forms, and the specific methods often vary from place to place.

It has the advantages of fresh water quality, large water exchange, balanced water temperature, small temperature difference, abundant dissolved oxygen, and easy human control, which meets the environmental requirements of mandarin fish fry. The cultivation of summer flowers by using the ring channel (tank) of the original hatching mandarin fish fry is the main method adopted by the production unit at present. The hatchery loop (tank) is a special body of water that mimics natural ecological conditions and keeps the fry in constant motion.

More importantly, when the mandarin fish fry open to feed, feed the palatable bait fish - the decapitated bream larvae or other live fry, which not only increases the feeding probability of the mandarin fish fry, meets the nutrients required for the growth and development of the mandarin fish fry, but also maintains fresh water quality.

The pond for cultivating mandarin fish fry is generally a cement pond, with an area of 30 50 square meters, and the water depth is kept at the meter, and some artificial reefs simulating natural waters can be set up at the bottom of the pond to create a good predation environment for mandarin fish fry. However, the bottom must have a certain inclination, and the bottom drainage outlet is provided with a seedling collection pond, and there are inlet and drainage devices. The drainage device is composed of a rubber pipe, a filter screen and a supporting steel bar, and the rubber pipe nozzle is fixed in the center of the steel frame, which requires that no matter how it is placed, it will not drain the pool water and maintain a certain water level.

When the mandarin fish grows to about centimeters, they can be put into small ponds for cultivation, and the stocking amount is about 10,000 per hectare. Forage fish must be pre-reared in ponds, generally 10 to 15 days before stocking mandarin fish fingerlings, with stocking densities of 12 million 22.5 million hectares. Add a small amount of fresh water regularly every day to prevent water quality from deteriorating.

The cage is an ideal place for mandarin fish seedlings to be cultivated. It can ensure that there is sufficient and easily available bait, and there is fresher water for continuous exchange. The disadvantage is that it can not be fed to the bait fish that has just been decapturated, and the boxes need to be washed frequently, and the cages need to be replaced regularly, and the management of fry is more cumbersome, and the operation is more difficult.

The cages are open floating boxes, framed with bamboo or round pipes, and are generally set up in large ponds. During the cultivation period, the attachments on the cage should be cleaned frequently, and the excrement in the cage should be removed to ensure the normal exchange of water inside and outside the cage.

The four common cultivation techniques of mandarin fish summer flower seedlings are flowing water cultivation, still water cultivation, small earthen pond cultivation, and cage cultivation.

1.Flowing water cultivation: Flowing water seedlings are divided into two ways: hatching tank and ring road seedling, and the operation is basically the same.

2.Still-water seedlings: Still-water seedlings are cultivated in fish ponds, cement ponds and cages.

3.Cultivation conditions: the pond for cultivating mandarin fish fry is generally a cement pond, with an area of 30 50 square meters, and the water depth is kept in meters, and some artificial reefs simulating natural waters can be set up at the bottom of the pond to create a good predation environment for mandarin fish fry.

In fact, in addition to water quality, there is also a problem that we need to pay attention to is the water temperature, the water temperature is too high or too low for the growth of mandarin fish is extremely unfavorable, this must be understood by everyone, not much to say, and then the water source, the best is tap water, a high-density breeding method. While this method is lucrative, it is also extremely risky. Especially in the third month, when the osmanthus fish eats a lot of food, the feces discharged are extremely polluting to the water body.

Ammonia nitrogen and nitrite are both very high. As a result, the water quality deteriorates. It makes the fish sick.

The pond of mandarin fish requires a sandy bottom, less silt, an area of 3 5 acres, a water depth of meters, convenient drainage and irrigation, light water quality, no turbidity, no sewage inflow, and a small amount of submerged aquatic weeds in the fish pond. Newly opened ponds depend on the quality of the soil, and acidic ponds and ponds with turbid water are not suitable for raising mandarin fish. And strictly control the body length of bait fish not to exceed 55-60% of mandarin fish.

This cultivation method should pay attention to water quality management, 60 cm water level at the beginning of stocking, and water injection every 3 days after stocking, each time the water injection is about 25 cm. Finally keep the pool water in meters. Same as above for disease prevention and control.

And the natural production is more, mandarin fish and any fish species have a characteristic, according to the water temperature, distributed in various places, in the water system of north and south of China, and prefer to hide behind the stones at the bottom of the water, waiting for the arrival of fish, and then prey. head with scales, small scales; dorsal fin long, divided into two parts; yellowish-green body color, grayish abdomen, irregular dark brown spots and plaques on the sides; 1 narrow black band from the snout through the orbit to the anterior inferior part of the dorsal fin; Odd fins have dark brown spots.

Mandarin fish is tender, less spiny, delicious and nutritious, and is a delicacy on the table and is favored by the majority of consumers. In the pond, not only can a small number of mandarin fish be mixed to remove wild trash fish, but also can be raised in a special pond, which is one of the popular breeding species at present. It should be the choice of restocking the fish species, generally for the choice of one, to observe whether it swims fast, whether the physique is large, whether the jump is advantageous, in the density, the general people will choose to be thinner, because this will allow the fish to grow slowly enough space to grow.

Mandarin fish is a fish that lives on the bottom, suitable for growing in an area with slow water flow, so the fish pond for breeding mandarin fish must have a water flow, and can not use stagnant water for aquaculture, such an environment is not suitable for its growth, and the depth of the fish pond is also required to be at least one meter eight. Moreover, mandarin fish is a fish that eats at night and rests during the day, and it is essential to plant some aquatic plants in the fish pond, and the abundant aquatic plants can also provide them with a lot of food. Mandarin fish requirements for water quality are also very high, must ensure that the water quality is not polluted, which needs to do some cleaning work regularly, the silt at the bottom of the fish pond must be cleaned up.

Mandarin fish does not require too much oxygen in the water, but we can't let the water be too hypoxic, and oxygen equipment is essential.

First of all, there should be fish ponds, and there should be living water, the kind with slow water flow, and you can't use stagnant water for farming. The water quality should be free of pollution. Secondly, some aquatic plants are planted in the fish pond, which can provide them with a lot of food.

Third, the fish pond should be cleaned of silt regularly. Keep the fish pond clean, clean the fish pond frequently, and the breeding density is reasonable, which can appropriately reduce the probability of insect pests. Fourth, oxygen equipment is indispensable.

Fifth, put in the feed based on small fish and shrimp, and then add some earthworms and bread worms as supplements. Sixth, ensure the water temperature conditions. The temperature suitable for mandarin fish is about 16 to 30 degrees.

The first is the management of water temperature, the temperature suitable for the growth of mandarin fish is 15 to 32 degrees, and the optimal growth temperature is about 20 to 30 degrees, and the minimum temperature is not lower than 7 degrees. There is also a need to feed according to the living habits of mandarin fish, and at a fixed time, the amount of food is reasonably controlled according to the feeding situation of mandarin fish. Finally, of course, the fish pond should be cleaned and disinfected regularly, and disease prevention measures should be taken.