California bass fry prices and breeding methods

California sea bass, also known as big mouth sea bass, is native to American freshwater lakes and lives in waters with low turbidity and distribution of aquatic plants. It was introduced to China in the 1980s with delicious meat, good taste and rapid reproduction. Therefore, many fishery farmers prefer to breed, so let's take a look at the price and methods of California perch fry.

How much is a California bass fry?

The price of California sea bass fry is about 0.15-0.3 yuan per fry, but it varies according to the specification, quality, market and quantity of the fry. California perch has the habit of protecting eggs, and the male leaves the nest to look for food after the fry emerge from the membrane. The newly hatched fry are nearly white and translucent, with a total length of 7mm and swimming in groups. On the third day after hatching, the yolk is absorbed and then begins to feed on Chlorella and rotifer, and then ingest plankton such as small cladocera and copepods. The fry hatched in natural waters within a month are still protected by male parents.

Seedling breeding of California perch

1. Parent fish cultivation: when harvesting adult fish, California bass with good physique, large size, no damage and no disease are selected as backup parent fish and cultivated in a special pond. 300 fish per mu are released. During the cultivation period, the bait is mainly small fish and shrimp, and the daily feeding amount is about 35% of the body weight.

2. Build spawning ponds: the spawning ponds should be prepared according to the production scale before the arrival of the breeding season. The spawning ponds should be the soil ponds on the slope of the sandy bottom, with an area of 1 mu and 2 mu, and some stones and bricks should be piled around. Some water plants are planted in the pond to prepare parent fish to build nests before spawning.

3. Artificial induction of labor: parent fish are paired with hormone injection at 1:1 according to individual size to induce parturition. Carp pituitary gland is 5 mg / kg of female parent fish, the first injection dose is 15%, and the remaining amount is injected every 12 to 14 hours. Male parent fish are injected 2 mg at the second injection of female fish.

4. Spawning time: California perch spawned for a long time. When the water temperature was 22: 26 ℃, the fish could not spawn until 18-30 hours after hormone injection, and spawned many times. The parent fish spawned continuously for 1-2 days in a spawning pool, and the spawning was completed on the third day.

5. Hatching method: the hatching time of California perch eggs is 31-33 hours when the water temperature is 20: 22 ℃ and 52 hours when the water temperature is 17-19 ℃. The artificial hatching is better by adding micro-running water in cement pool or net cage in fresh water pool with high dissolved oxygen.

Culture methods of California perch

1, fish pond conditions: California perch pond requires adequate water source, convenient drainage and irrigation, no leakage, water depth of more than 1.5 meters, good water quality, no pollution, ventilation and light transmission, the bottom material is loam, the area should not be too large, 1 mu is appropriate, equipped with aerator.

2. Stocking density: California sea bass generally put 2, 000 fish fry per mu, and fish ponds with good conditions and equipment can be put into 3, 000, 000 fish ponds. Proper mixed culture of silver carp, bighead carp, grass and mackerel can help clean up feed residues and regulate water quality.

3. Bait selection: the key to California perch culture is to have enough bait fish. Silver carp and bighead carp fry can be cultivated in fish ponds, and some small fish can be cultured in adult ponds with nets. Wild miscellaneous fish or special bait can also be purchased.

4. Bait feeding: California perch is a fierce fish, which feeds on live fish. The bait is usually given once in the afternoon and once in the afternoon. When the water temperature is 20: 25 ℃, the daily feeding amount is 10% 15% of the fish weight, but it should be flexibly controlled depending on the fish's feeding, activity and weather changes.

5. Daily management

① Pond Patrol: inspect the fish ponds every day to observe the changes of fish activities and water quality, avoid the pond water being too turbid or fertile, the transparency should be 30cm, find problems in time and take measures to solve them.

② anti-drug: strictly prevent pesticides, public hazards and other substances from entering the pond, so as to avoid the death of pond fish, especially young fish are extremely sensitive to pesticides, a very small dose will cause the death of fish fry in the whole pond, which must be paid great attention to.

③ feeding: the amount of feed should be appropriate, do not be too much or insufficient, and avoid long-term use of a single feed. Vitamins and minerals should be added to the feed to maintain normal nutritional requirements.

④ thinning: timely grading and thinning, about once every two months, put the fish of the same specification in the same pond to avoid eating big fish and small fish, separate cultivation should be carried out in the morning when the weather is good, do not separate cultivation when the weather is hot or cold.

Disease prevention and treatment of California perch

1. Rotifer and oblique tube disease

Symptoms mostly occur in water bodies with small pond area, shallow water level, high culture density, more organic matter or too thin water quality, and are more likely to occur in continuous overcast and rainy weather. Microscopic examination shows that a large number of worms are parasitic on the body surface and Gill of the fish.

[control] regularly sprinkle the whole pond to kill the worms. On the first day of treatment, the three effects were changed to 250g / mu + Likejing 33ml / mu in the whole pool, and Yufeng iodine 500ml / mu or compound iodine 66ml / mu was sprinkled in the whole pool on the second day.

2. Anchor head disease

[symptoms] the parasite is parasitic on the dorsal fin, ventral fin, caudal fin base and body surface. It is visible to the naked eye that part of the parasite is exposed outside the host, and the parasitic site generally has bleeding, weight loss and loss of appetite.

[prevention and control] the net of insects is 250.35 ml per mu of water depth, and the anchor head in the water can be completely killed if there is recurrence and repeated use once.

3. Sea bass canker

[symptoms] there were inflammatory lesions of different sizes on the side of the body, caudal stalk, abdomen, head and the base of the fin, where the scales fell off, bleeding and inflammation, and all the epidermis and dermis rotted off to reveal congested muscles.

[prevention and treatment] external chlorine preparation disinfection or iodine net 500ml / mu whole pool sprinkling disinfection, once a day, 2 times continuously, at the same time, Yufukang 0.15 g + Tylvir 0.2 g per 1 kg fish body weight was given for 5 days continuously.

4. California perch enteritis

[symptoms] the diseased fish are black and emaciated, the intestinal wall is congested and red, in severe cases, the abdomen is swollen, the anus is red and swollen protruding, there is yellow mucus outflow, often wandering alone or living at the bottom, and the appetite is obviously decreased.

[prevention and treatment] the feed should be fresh and high quality, and the bait made of allicin powder or oxytetracycline can be added to the feed for 3 to 5 days.

5. Water mildew

[symptoms] the wound of diseased fish seems to be attached with a mass of gray-white flocs, the fish is very weak, floating on the water, popular every winter and spring, often secondary infection in the focus of ulcer disease, causing a large number of deaths.

[prevention and treatment] remove excessive silt from the bottom of the pond, clean the pond with 200ppm quicklime or 20ppm bleach, sprinkle mu an 100ml / mu, and take antimicrobial agents (such as Yufukang, sulfonamides, etc.) to prevent bacterial infection.