The southern estuary is a large-scale carnivore fish that is mainly produced in the Yangtze River system in China. After years of domestication, it has been successfully cultivated in ponds. The southern estuary has the advantages of strong adaptability, large individuals, rapid growth, high aquaculture production, and delicious meat taste, and is thus deeply loved by people. The Hunan fish stock farm started the seed breeding trials of the southern bigmouth puffer from 1999 to 2000. The method is now described as follows.
Fry cultivation
Spraying
Southern largemouth bass culture is better cultivated in small water bodies. When the natural water temperature stabilizes at above 18°C ​​in April each year, the pure southern estuary can be bought back from the seed farm. Stocking densities range from 1000 to 1,500 (the specific number is determined by the culture conditions), and the water temperature difference cannot exceed 3°C.
Feeding
The body length of the fry was mainly 8 minutes before the intake of blisters. Mink can be taken from natural water bodies. As the fry grows, the need for leeches gradually increases. However, in practical production, the amount of fish is often insufficient. To this end, the artificial cultivation of leeches, the specific method is: In the purchase of the flower before the first two weeks, the depth of 0.5 meters -1 meter of earthen pond, inject fresh water, and keep the water temperature at 18 °C -25 °C. 2.0 kg of manure is applied to every square meter of water. After every two days, fertilization is performed once, and 0.8 kg-1 kg of fertilizer is applied per square meter of water. When the pool water reaches a certain degree of fatness, 20 grams of water per cubic meter of water is added to 30 grams per cubic meter of water. In 5 days to 10 days, the otters will have a lot of breeding and they will be covered in the whole pool. At this point you can collect leeches to feed fry.
The fry can grow to more than 3 cm after 10 days of incubation under conditions of stable water temperature and sufficient feed.
Fish breeding
When the southern largemouth bass grows to more than 8cm, the food intake increases, and it is not enough to rely on the amount of leeches to meet its needs. It can be cultivated with fish paste and leeches.
Fish slurry cultivation method
When the fry grows to more than 3 centimeters, the fish can be beaten and slurried, and 0.2%-0.3% of the fish is used as a attractant. The fish is put into the water to slowly ingest the fish gill, and then gradually increase the gill. The amount until you completely eat the fish.
Aquaculture
When the fry grows to 3 cm, gradually reduce the amount of leeches and increase the amount of leeches until they fully eat leeches.
Water leeches can be harvested from shallow water trenches where humus in the field is rich in microfluidic water. It can also be obtained by artificial breeding methods. The cultivation method is: the area is invariable, a layer of mud is laid on the bottom of the pool, and the thickness is 8cm to 10cm, the water depth is 30cm to 40cm, and then a little quail species is introduced, and the fermented wheat bran and rice bran are used as feed every 3 days. - Feeding once a day for 4 days, 250 grams each time, when a certain amount is reached, it can be collected and fed. This method can produce 8 grams to 26 grams of water per square meter per day.
Daily management
Dissolved oxygen
Oxygen in the large aquaculture ponds in the South is required to be above 3 mg/l, with floating heads appearing as low as 2 mg/l. In the production, generally every 3 days - 5 days water injection 1, pay attention to the water temperature difference can not exceed 3 °C, to maintain the water quality tender green, conditions can be used micro-water aquaculture.
Water temperature
The survival temperature of the southern estuary is below 38°C, and the optimum growth temperature is 18°C-32°C. In the stage of fry and fingerling cultivation, if the water temperature in nature is low, and changes are frequent, the water temperature is not stable, and timely attention should be paid to the water body insulation work. Thin film coverage can be used in production practice to increase water temperature.
Bait
Feeding method: Feeding of bait should adhere to "timing, fixed-point, qualitative, quantitative". Feed twice a day, 9:00-10:00 a.m., feeding 40% of the daily feed, 18:00-20:00, accounting for 60% of the daily feed, total daily feeding It is 6%-8% of fish's body weight.
Grading
The southern estuary grows unevenly in the fry incubation stage. When it reaches 3 cm above the water, individual growth speeds vary greatly. They have habits of self-inflicted slaughter, and they often eat small foods. Therefore, they must be fed in batches in a timely manner and strictly control the density.
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