Detailed Introduction to Sea Bass Fry Prices and Breeding Methods

Sea bass is one of the common economic fish species, is also a species for developing marine aquaculture, and is also one of the important economic fish species that grow naturally. Artificial breeding has a history of nearly 20 years, and in recent years, driven by the market economy, sea bass breeding technology has made relatively large breakthroughs. Let us take a look at sea bass fry prices and breeding methods together below!

How much does one sea bass fry cost?

The price of sea bass fry is about 0.5 to 0.8 yuan per fry, but prices vary greatly depending on fry size, variety, place of origin, market, and other factors. In fact, many kinds of fish can be called sea bass, among which four are the most common. For example, the Japanese sea bass is distributed in offshore waters and estuaries where seawater and freshwater meet, the Songjiang sea bass is a catadromous migratory fish and is the most famous, the California sea bass is a new variety introduced from the United States, and the river perch is also called redfin perch or five-striped perch, native to the northern region of **. Fry prices vary greatly among different varieties.

What varieties of sea bass are there?

1. Largemouth bass: Largemouth bass is a freshwater fish, also known as California sea bass, native to the United States. It was introduced into China in the 1980s as a substitute variety for Japanese sea bass. Most of the freshwater sea bass seen on the market belong to this variety.

2. River perch: River perch is the biological sea bass, also known as redfin perch, five-striped perch, etc. According to the biological definition, only this kind of river perch can be directly called "sea bass". In China, there are naturally distributed populations only in **.

3. Songjiang sea bass: Songjiang sea bass is also known as Songjiang four-gill perch. It is a coastal shallow-sea fish, generally growing and fattening in freshwater river areas connected with the sea. After sexual maturity, it descends into the sea to spawn, and the young fish return to freshwater rivers to live.

4. Barramundi: Barramundi is also known as giant sea perch, blind perch, etc. It is distributed in river systems in Africa as well as coastal and estuarine areas of Asia and Australia. It is farmed in Southeast Asian countries, Australia, and Hong Kong, Taiwan, Hainan, Shenzhen, Zhongshan, and other places in China.

5. Walleye: Walleye is an important sport fish and economic fish in the United States, Canada, and other countries. In Canada, its production ranks second among freshwater fish, and it has a breeding history of more than 100 years in the United States and Canada.

Sea Bass Breeding Methods

1. Pond conditions: The pond area for sea bass breeding should preferably be 5 to 10 mu, with a water depth of more than 2 m, abundant water sources, pollution-free water quality, good inlet and drainage facilities, and convenient transportation. At the same time, 1 to 2 aerators of 1.5 kW should be equipped, and the farm should have a backup generator set.

2. Pond clearing and disinfection: Before stocking sea bass, the pond needs to be cleared. Use 7 to 10 kg of quicklime per mu, maintain the pond water at 10 to 20 cm, and splash the slurry. After 7 days, add water to a depth of 1 m, apply 0.75 kg of diammonium phosphate per mu at one time, and after two days, when the pond water turns oily green, stocking can begin.

3. Temporary rearing method: At present, sea bass fry are mostly caught at sea. In spring, sea-caught fry are about 2.5 to 4 cm. After capture and transfer, the fish body will be injured to varying degrees. To improve the survival rate of breeding, intermediate temporary rearing can be carried out first. It is more convenient to set up 40-mesh cages in the breeding pond.

4. Fry stocking: For temporary rearing of sea bass, stock 2000 to 3000 fry per cubic meter of water, splash with chloramphenicol for disinfection, feed Artemia nauplii for the first 10 days, then feed fresh minced fish. When the fry are cultured to about 10 cm, stock them into the grow-out pond at 1.5 fish per square meter.

5. Bait selection: The bait for sea bass is mainly low-quality trash fish, supplemented with artificial compound feed. Because they compete quickly for food and have a large food intake, feeding at fixed times and in fixed amounts is very important. When feeding, it is necessary to ensure the fish eat their fill without wasting bait.

6. Feeding management: The daily feeding frequency and feeding amount for sea bass vary with the season. In warm seasons suitable for rapid growth, feed 4 to 5 times a day, with the feeding amount being 10 to 30% of fish body weight. In low-temperature early spring and late autumn, feed 2 to 3 times a day, accounting for 1 to 10% of fish body weight.

7. Pond inspection: In sea bass breeding, inspections should be carried out in both the morning and evening to observe the pond, and any abnormalities should be dealt with promptly. The contents of pond inspection include fish activity and changes in pond water color, smell, and transparency, and attention should also be paid to anti-escape facilities and predators in the pond.

Sea Bass Disease Prevention and Treatment

1. Eye opacity disease

[Symptoms] Mostly seen in the fry and fingerling stages in spring and summer. White spots appear on the eyeball, gradually expand and cover the entire eyeball, and in severe cases the eyeball protrudes and falls off.

[Prevention and treatment] Renew the aquaculture water body, feed fresh bait, and add vitamins to the bait (especially add B).

2. Saprolegniasis

[Symptoms] Flocculent bacteria appear on the fish body. Sick fish float to the surface and swim slowly, have poor appetite, become emaciated, and die. Most cases are caused by infection after the fish body is injured.

[Prevention and treatment] Replace with new water, maintain good water quality, and bathe with 6×10-6 malachite green for 5 to 10 minutes.

3. Skin ulcer disease

[Symptoms] More common in high-temperature seasons. Local scale loss, congestion, and ulceration occur on the fish body. Sick fish have poor appetite, float up and swim slowly, become emaciated, and die.

[Prevention and treatment] Bathe with 20×10-6 chloramphenicol (or nitrofurazone) for 4 to 5 hours.

4. Enteritis disease

[Symptoms] Sick fish have abdominal distension, red and swollen anus, and yellow mucus flowing out. The fish become emaciated, have poor appetite, and severe cases die. It is caused by spoiled bait and high fat content in the bait.

[Prevention and treatment] Prepare furazolidone medicated bait at an addition rate of 0.1%, and feed continuously for 5 to 7 days.

5. Fish louse disease

[Symptoms] Fish lice parasitize on the fish body. Sick fish swim restlessly and rub against the pond walls. In severe cases, the fish become emaciated and die.

[Prevention and treatment] Splash crystalline trichlorfon over the whole pond so that the pond water reaches a drug concentration of 0.25×10-6 to 0.3×10-6. Apply the drug again after 3 days. Generally, two applications can cure it.