The price and culture method of sea bass fry

Sea bass is not only one of the common economic fish, but also a species for the development of marine aquaculture, and it is also one of the important economic fish growing naturally. Artificial culture has a history of nearly 20 years. In recent years, driven by the market economy, bass culture technology has made a great breakthrough. Let's take a look at the price and culture methods of sea bass fry.

How much is the sea bass fry?

The price of sea bass fry is about 0.5-0.8 yuan, but the price varies greatly due to the specification, variety, origin and market of the fry. In fact, there are many kinds of fish can be called bass, of which there are four most common, such as sea bass distributed in coastal and estuarine interchange of seawater and fresh water, Songjiang bass is a descending migratory fish, the most famous, California bass is a new species introduced from the United States, and river bass, also known as red perch, Wudao black, native to the northern region, different species have very different fry prices.

What kinds of bass do you have?

1. Big mouth sea bass: big mouth sea bass is a kind of freshwater fish, also known as California perch, originally from the United States. It was introduced into China in the 1980s as an alternative species of sea bass, and most of the freshwater bass seen on the market are this species.

2. River perch: the river perch is a biological perch, also known as red perch, Wudao black and so on. According to the biological definition, only this kind of river perch can be directly called "perch". There is only a natural distribution population in China.

3. Songjiang perch: Songjiang perch, also known as Songjiang perch, is a coastal shallow sea fish. it generally grows and fattens in the freshwater river area connected with the sea. after sexual maturity, it falls into the sea to lay eggs, and the young fish return to live in the freshwater river.

4. Sharp-nosed perch: the sharp-nosed perch, also known as golden perch, blind perch, is distributed in the river system of Africa and the coasts and estuaries of Asia and Australia. It is cultured in Southeast Asian countries, Australia, Hong Kong, Taiwan, Hainan, Shenzhen, Zhongshan and other places.

5. Big-eyed lion perch: big-eyed lion perch is an important swimming fish and economic fish in the United States and Canada. It accounts for the second place in freshwater fish production in Canada, and has been cultured in the United States and Canada for more than 100 years.

Culture methods of sea bass

1. Pond conditions: the area of sea bass culture pond should be 510 mu, the water depth is more than 2 meters, the water source is sufficient, the water quality is pollution-free, there are good water intake and drainage facilities, convenient transportation, and are equipped with 1 to 2 1.5 kilowatt aerators. The breeding farm should have power generation backup units.

2. Clear the pond and disinfect: the perch should be cleared before stocking. Use quicklime 7: 10 kg per mu, keep the pond water 10-20 cm, soak and pour wine. After 7 days, add water to 1 meter deep, can apply diammonium 0.75 kg / mu, two days later, the pond water turns oil green and can be stocked.

3. Temporary culture mode: at present, most of the sea bass seedlings are caught by the sea, and the sea catch seedlings are about 2.5cm in spring. The fish will be injured in different degrees after fishing and transporting operation. In order to improve the survival rate of culture, temporary culture can be carried out first. It is more convenient to set up 40-mesh cages in the culture pond.

4. Fish fry restocking: sea bass temporarily reared 2000-3000 larvae per cubic meter of water, disinfected with chloramphenicol, fed Artemia larvae in the first 10 days, and then fed fresh surimi. When the fish fry were cultured to about 10 cm, 1.5 larvae per square meter were put into the culture pond.

5. bait selection: the bait of sea bass is mainly low-quality miscellaneous fish, supplemented by artificial ingredients, because of fast food grab and large food intake, regular and quantitative feeding is very important. When feeding, it is necessary to master that the fish is full without wasting bait.

6. Feeding management: the daily feeding times and amount of sea bass vary according to the season, 4 times and 5 times in the fast growing season, 10% and 30% of the fish's body weight, and 2 times in the early spring and late autumn at low temperature, accounting for 10% of the fish's body weight.

7. pond inspection: perch culture should patrol the pond in the morning and evening, and deal with anomalies in time. The contents of pond inspection include the changes of fish activity and pond water color, smell and transparency, as well as pond anti-escape facilities and enemy damage, etc.

Disease prevention and control of sea bass

1. White candle disease of eyeball

[symptoms] more common in the spring and summer fish fry stage, the eyeball appears white spot, gradually expand to cover the whole eyeball, serious exophthalmos fall off.

[prevention and control] renew the aquaculture water body, feed fresh bait and add vitamins (especially B).

2. Water mildew

[symptoms] Flocculent bacteria appeared in the fish, and the diseased fish swam slowly on the surface, lost appetite, emaciated and died, most of which were caused by infection after injury.

[prevention and treatment] replace new water, keep good water quality, dissolve malachite green with 6 × 10-6 malachite green for 5 minutes for 10 minutes.

3. Skin ulceration

[symptoms] most common in high temperature season, local descaling of fish, hyperemia and ulceration, loss of appetite of diseased fish, floating slowly, emaciation and death.

[prevention and treatment] 20 × 10-6 chloramphenicol (or furacilin) was bathed for 4 hours for 5 hours.

4. Enteritis

[symptoms] abdominal distension, anal redness and swelling, yellow mucus outflow, weight loss, loss of appetite and severe death of diseased fish were caused by deterioration and high fat content of the diet.

[prevention and treatment] Furazolidone bait was prepared with 0.1% addition and fed continuously for 5 days.

5. Fish lice disease

[symptoms] the fish body parasites fish lice, the sick fish swim restlessly, rub against the pool wall, and the heavy fish lose weight and die.

[prevention and treatment] the whole pool was sprinkled with crystal trichlorfon to make the water content up to 0.25 × 10 ~ (- 6) × 10 ~ (- 6) and 0.3 × 10 ~ (- 6). Once every 3 days, it can be cured by two times.