Healthy fish breeding technology

The squid, also known as osmanthus fish and seasonal flower fish, is taxonomically subordinate to the genus Euphorbia, Finidae, and Eel. The meat is delicate, has a delicious taste, and has a high protein content. It is a valuable fish among freshwater fish. At present, commercial eel is mainly obtained from natural water bodies such as rivers, lakes and reservoirs. With the continuous improvement of people's living standards, wild eels are far from meeting the market demand. Therefore, the healthy eel farming of eels has good development prospects.

Biological characteristics

1.1 Morphological characteristics Eel body fat is thick and fleshy, high side and flat, large mouth, end position, mouth crack is slightly tilted, the maxilla extends to the posterior edge of the eye, the jaw is slightly prominent, the small teeth in the anterior and the lower jaw expand into canine teeth, On the lateral side of the eye, the posterior edge of the front humerus has 4 to 5 spines. The back of the sacrum has 2 flat spines. The round scales are small, the dorsal fins are long, the front is the spines, and the back is the soft branches. The body has a yellow-green color and a yellow-white belly with irregular brown stripes and patches on both sides of the body.

1.2 Habits of sea trout widely distributed in rivers, lakes, reservoirs, like to inhabit in a clean, transparent, micro-flowing environment. Often drilled into the crevices of the cave or in the grass. He likes to feed at night and dive into deep water in winter. Squid is a typical carnivorous fish, like to eat live food, often devour more than their own length of carp, grass carp, herring, bream, scorpion, scales and other live fry. At different stages of growth, the food intake is different. Squids less than 15 cm in length prefer to eat shrimp and small fish, and those 25 cm or more prefer to eat larger fish such as oysters and clams. They also like to eat flat and slender squid fish.

2. Healthy aquaculture technology

2.1 Seedling cultivation Fry ponds should be completely cleared, with an area of ​​2 to 3 mu. It is advisable to use 150 kg of lime per mu to eliminate the enemy pests and pathogens. After the clear pond is put into a 1 meter deep new water, 200 fish fry are put on the water per square meter. Feeding palatable feed according to different stages of growth of the carp is the key to raising the survival rate of the fry. Freshly hatched eel fry for 3 to 5 days is suitable for eel and eel fry at the same age. 6 to 8 days of carp seedlings can also eat three to five days old four fry. Ninety-six-day-old carp seedlings can eat 1 cm long bait fish. According to production experience, a three-centimetre-long eel fry (scrub) was bred. In the first 10 days, 40 fish fry were fed on average each day. After 10 days, 15 fish fry were slightly smaller than their own specifications. If the number of bait fish is insufficient, it will cause the salmon fry to kill each other. Therefore, while nurturing salmon fry, we must also develop bait fry cultivation. In actual production, the amount and type of feeding can be flexibly controlled to meet the feeding standards of the eel fry.

2.2 Adult fish breeding

2.2.1 Pond conditions The squid is suitable for breeding in small ponds. The pond area is generally 2 to 3 mu, and the depth of the pond is about 1.5 meters. Before the carp seedlings enter the pond, they must thoroughly clear the pond. The commonly used drug is lime, with 150 kg per acre. The amount of bleaching powder used for the pool water is 20 mg/L. Generally disappeared after 10 days in the clear pond. Put some fish into the bucket after the pool is filled. If there is no abnormality for 24 hours, stocking can be carried out.

2.2.2 Stocking Density According to the pros and cons of the farming conditions and the level of the technical level, generally 1,000 to 1,500 tails of carp and summer fish are stocked at 3.3 cm per acre.

2.2.3 Bait fish source The natural feeding habit of squid is to feed on live fish. There are three ways to feed bait fish. The first is to buy home-breeding flowers and keep them feeding at any time. The second is to cultivate and collect wild-fry larvae. Dianchi Lake should be accompanied by about 3 mu of bait fish breeding pond. You can put squid, squid or some wild fish breeding earlier and multiplying in large quantities, and breed large numbers of fish fry for squid feeding; the third is to save fish ponds. Putting some small-sized fish, such as head fish and squid fish, directly in the squid pool will have more reproduction times and meet some of the requirements of squid.

2.2.4 Bait Fish Feeding To raise the weight of 0.5 g (about 3 cm in length) of carp seedlings to 500 g of commercial fish, about 5,000 bait fish (about 3 kg) will be consumed. According to the growth of fish and weather conditions in time to put the bait fish, it is best to put it in 3 to 5 days, so that the bait fish in the pond to maintain a certain density. When the source of the feed is sufficient, fish should be fed as far as possible so that the fish can have enough food and feed fish can not be eaten. At the same time, they are caught and sold with the carp.

2.2.5 The daily management is mainly the morning and evening patrol ponds to observe the feeding conditions, growth status and water quality of squid.

To maintain good water quality, make the dissolved oxygen in the water more than 5 mg/L. Generally, change the soil level every two weeks. At the same time, flush the water when the water quality becomes rich. When the summer weather is hot, use aerators to increase oxygen. In order to avoid excessive water quality. Certain aquatic plants can be cultivated in water to purify the water, which is conducive to the growth of carp.

In addition, we must also pay attention to anti-theft and anti-theft security. In and out of the outlet, we must use a sieve mesh to prevent the fish from fleeing with the water. In the adult stage and when it is about to be arrested, people should be sent to duty.

The anti-theft fish incident occurred.

3. Disease and its prevention

The prevention and treatment of carp disease is an important task that runs through the whole process of carp farming. Due to the special dietary characteristics of carp, internal medicine has almost no cure for it, so disease prevention is very important in the process of carp farming. In preventive measures, we must pay attention to eliminate the cause, cut off the means of infection and invasion of fish, but also to improve the fish's resistance to disease, and take comprehensive preventive measures in order to achieve the desired preventive effect.

3.1 Creating a good ecological environment

The first is thorough disinfection of clear ponds, whether it is dry clear ponds or water clear ponds, the effect of lime clear ponds is good, not only can improve the bottom quality, but also completely kill some pathogens that other drugs can not kill, such as Spores, viruses, etc.; followed by maintaining a suitable culture environment, the water depth should be gradually increased to 2 meters with the growth of fish, pH 6.8 to 7.5, dissolved oxygen is maintained at 5 mg / liter or more, control of hydrogen sulfide and ammonia in water Concentration; third is not to make the carp floating head, carp oxygen demand for high water, easy to float head, even after taking measures to return to normal, the body of the fish floating over the immune system decreased, often due to changes in the external environment or pathogen invasion And one after another died, causing great losses. Therefore, in addition to regular water flushing to keep the water clean, the mechanical oxygenation is indispensable, generally 5 to 8 acres of water supporting 3KW aerator, according to the situation of starting oxygen, can effectively improve the water environment, prevention Floating head.

3.2 Bait fish processing

In addition to the medium-sized and abundant fish, bait fish should be particularly quarantined and disinfected before the bait fish enter the pool; it should be prevented from entering the pond to cause fish infections, and it is commonly used to dip 3% to 5% salt water.

3.3 drug prevention

Proper drug prevention can prevent the occurrence and spread of fish disease when squid transportation, fish fingerlings are divided into ponds or when they are transferred to large water surface stocking. There are three kinds of fish disinfection methods, 1 is the dip disinfection method, can be in the barrels, canvas buckets, water tanks and other containers into the extension. 2 is a hanging mash disinfection method, this method is very effective and convenient for cages raising squid. When the fish species has just entered the box or just feed the bait fish, a bamboo pole is hung in the middle of the cage. The bamboo pole sinks into the water surface for about 50 centimeters and the bamboo pole covers. A small stone is added to the bamboo basket as a sinker, and then 100 grams of bleaching powder is put into each bamboo basket. Before loading bleaching powder the next day, the residue from the previous day is washed in place. 3 Dyke Bag Disinfection Method. In the season of parasitic disease, once every 7 days, the hanging bag is hung in the middle of the cage. One cage hangs 1 bag. Each bag contains 100 grams of copper sulfate and 32 grams of ferrous sulfate. . In addition, various tools are also sterilized. Small tools can be soaked in a container containing 10 mg/L of copper sulfate for more than 5 minutes. The large tools are exposed to sunlight after each use.

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