Price and culture method of puffer fish fry

Puffer fish, also known as bubble fish, belly fish, puffer fish, etc., are the general name of the bony fish family. They inhabit the middle and lower layers of the ocean, and a few species enter the freshwater rivers. When they encounter external dangers, they make the whole body float in a ball shape. At the same time, the small thorns on the skin stand up for self-defense. Let's take a look at the price and breeding methods of puffer fish fry.

How much is a puffer fish fry?

The price of puffer fish fry is about 0.8-2.5 yuan per fry, but it varies greatly due to the specification, quality, origin and market of puffer fish fry. Puffer fish feed on fish, shrimp, crabs and shellfish, as well as the leaves and filamentous algae of insect larvae, cladocera, copepods and higher plants. The common species are red-finned oriental puffer, dark striped oriental puffer, black Gill rabbit puffer, concave nose puffer, black spot spotted nose cuttlefish and so on.

Culture techniques of small size fish species

1. Pond selection: the pond requires sufficient water source, no pollution and little change in annual water temperature. if brackish water or fresh water is used, the pond should be built in a place with convenient water lift, short route and low lift, and there is basically no water leakage and seepage at the bottom of the pond. it is easier to build dikes and gates.

2. Clean-up and disinfection: drain the water from the pond in winter or idle time, dig out the mud at the bottom, and then expose the fish naturally. Before the fish go into the pond, disinfect the pond with quicklime, bleach, etc., store water and release the fish a week later. And apply sufficient base fertilizer to facilitate the reproduction of plankton.

3. Fish stocking: fish species are cultivated indoors to 1.2cm to 1.5cm and 10,000 to 20,000 per mu. The transportation time can ensure the survival rate within 7 to 8 hours. When stocking, the temperature should be above 18 ℃. Pay attention to the temperature difference inside and outside the bag should not be too large.

4, bait feeding: before the total length of fish species is 3 cm, each mu of ponds are fed with 1 kg of soybean milk per day to reproduce plankton, and pay attention to transparency, generally about 30 cm. If there are too many bait organisms, new water should be injected to reduce the biological density and keep the water quality fresh.

5. Sparse cultivation: the size of the fish can reach 3 cm after 20 days in the pond. While feeding soybean milk to control the bait organisms, the eel is used to make soft particles the size of soybeans, and fed on the beach to domesticate the fish species to eat eel. At the same time, large size fish fingerling is cultivated separately.

Culture techniques of large size fish species

1. Fish stocking: disinfect the seedlings with 5ppm bleach or 1ppm malachite green for 10 minutes before stocking. The temperature difference should not be too large, the water source is sufficient, the water quality is good, and the ponds with large water exchange capacity can appropriately increase the density and gradually catch large and small fish.

2. Seedling domestication: within a week, fresh and palatable fish, shrimp and shellfish were used as open bait for domestication. After the fish were used to eating, the artificial feed was gradually mixed into the bait, and the amount of artificial feed was gradually increased.

3. Bait feeding: eel is the main feed, and the daily feed accounts for about 37% of the fish's body weight. Positioning, quantitative, fixed speed and quality are required when feeding. Generally, bait is fed twice a day, and it is best to set up a feeding table in the pond in order to check the feeding situation in time.

4. Water quality control: pond culture should add new water irregularly according to water color, water quality, transparency, dissolved oxygen and fish and shrimp activities, change water once a month to improve water quality, and pay attention to the change of water temperature. in addition, it should be noted that puffer fish have higher requirements for dissolved oxygen.

5. Timely separate culture: there are great differences in the grazing ability of fish species of different sizes. Large individuals often attack small individuals during grazing, which seriously affects the feeding and growth of small individuals, so separate rearing of individuals of different sizes is generally carried out once every 30 to 45 days.

6. daily management: patrol the pond every day, observe the activities of puffer fish, food intake and water color, water quality, check breeding facilities, and measure the physical and chemical factors of water body regularly every day, such as water temperature, pH value, dissolved oxygen, ammonia nitrogen, COD, PO4-P, transparency and so on.

Control of diseases and insect pests of puffer fish

1. Diphtheria

[symptoms] the diseased fish first blackened the mouth, then turned into ulcerative albino, and then the alveoli of the upper and lower jaws were exposed in the shape of a "rotten mouth". The seriously ill showed special abnormal behavior of frenzied swimming and biting each other.

[prevention and treatment] there is no effective treatment, we should give priority to prevention, timely sorting and breeding to avoid excessive density and ensure the high quality of bait.

2. Heteroclenosis

[symptoms] when the number of parasites is large, the body color of the puffer fish becomes black, the body is thin, the gills show obvious anemia symptoms, the diseased fish lose their appetite, swimming is weak, and gradually die.

[prevention and control] the general drug effect is not good, the prevention and control effect of this disease is better without metal cage culture, and the aquaculture seawater needs to be exchanged well.

3. The third generation insect disease

[symptoms] it is difficult to judge the appearance of the early diseased fish. In severe cases, there are spots on the Gill filament, the edge of the Gill flap is gray, the fish skin erosion, redness, bleeding, fin damage, and finally die.

[prevention and treatment] the diseased fish were washed for 15 minutes with 20ppm potassium permanganate and 25 minutes with 200ppm~300ppm formalin.

4. Rotifer disease

[symptoms] the diseased fish are characterized by blackening, leaving the group and swimming alone, and some swim wildly around the edge of the pool in groups, often causing a large number of deaths of fish fry and species.

Copper sulfate and ferrous sulfate 0.5 grams and 0.2 grams per cubic meter of water are sprinkled once in the whole pool after the mixture is prepared.