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Jinmuluo is a carnivorous fish. The phenomenon of killing of uncultivated fish fry is widespread, and the survival rate of culture is extremely low. Therefore, the key to the survival rate of Jinhujing pond cultivation lies in the domestication and cultivation of the early fry.
In 2010, the author started the research on the technology of grading, domesticating and breeding of the Jinyuanyuanyuan pond in Baijiao Town, Doumen City, Zhuhai. After several years of exploration, the current technology can increase the survival rate of Jinmujing from below 20% to more than 45.1%, providing technical support for the stable production and increase of production of Jinmujing.
Domestication pond
Pond conditions
Aquaculture ponds require sufficient fresh brackish water, reasonable design for drainage and drainage, and convenient drainage and irrigation; the bottom is flat, and the bottom is sand and mud bottom, which is impermeable to water; the water depth is 1.5-2.2 meters. Each acre with impeller aerator 1.5kW.
2. Pond preparation
After dredging, exposing and leveling the bottom of the aquaculture pond, the entire pond is splashed with lime-lime clearing ponds, the amount of mu is 80 kg, and then 2 grid fences are set up in the original pond, which are used as the fry standard pool and fingerling domestication pool, respectively. 4:1. In the domestication pool for fingerlings, three to five small pools are divided by a fence to serve as domestication ponds of different specifications. After injecting fresh water, Quanchipi splashed lime 5 kg/mu to purify the water. After 3 days, fermented organic fertilizer and beneficial microorganisms were used to cultivate basic food organisms.
Fish stocking, screening and domestication
Stocking density
For fish fry 20 days old and 25 days old and over 1 cm in length, the stocking density was 1104 tails/mu -2104 tails/mu.
2. Sorting fry
The full-length 1 cm fry is to be bred in the standard tank for 12 days to 15 days. When the main fry grows to 2.5 cm to 3.0 cm, the first screening will be carried out. The 7th, 7th, 7th, 8th, and 8th, half, respectively, will be performed. Different types of fry are put into different domestication pools for cultivation, and the 7-to-five fish fry are returned to the standard coarse pool for further cultivation. Afterwards, the standard coarse fry fry is screened every 5 days to 7 days. The fry are placed in the corresponding domestication tanks for cultivation; as a rule, they are usually screened once or two times.
3. Domestication of fry
During the first week of seeding, two lagoon-feeding larvae of 1kg/mu - 2kg/mu were planted twice a day; when the total length of the fry was about 2cm, the mixed fish, shrimp, and meatballs were started and fed 3 times - 5 times daily. Feeding amount is 10%-15% of the fish's body weight, and it is timely adjusted according to the feeding conditions of the fry and the density of zooplankton in the pool water; when the main body grows to 4 cm-5 cm, the artificial compound feed is gradually tamed and fed 2 times a day. -3 times, the daily feeding amount is 8% -10% of the fish's body weight.
For fry placed in domestication ponds, it is necessary to mix and feed mixed fish, shrimp and meat, and artificial compound feed for acclimation, and gradually increase the proportion of artificial compound feed, and feed 2 to 3 times per day at regular intervals. It is 8%-10% of fish's body weight.
4. The fry generally grows from 30 days to 40 days and grows up to 5 cm to 7 cm in length. It can completely ingest the artificial compound feed and then remove the fence to directly enter the culturing stage. It can also be moved to the pond as needed.
5. At the same time as the breeding of goldfish species, a seine net was used to raise the filter-feeding eel and omnivorous eel in the other corner of the pond. After 30 days, the seine net and the golden-eye eel were released. The polyculture density of carp ponds with a total length of more than 10 cm is 40/mu - 60/mu; the polyculture density of catfish ponds with a total length of more than 5 cm is 50/100 mu/mu.
summary
Practice has shown that it is necessary to grasp several key points in order to do a good job of classifying, domesticating and cultivating the Jinmujing Yuantang:
1. Set up several domestication ponds in the original pond in advance to facilitate the subdivision of the fry and multiple sub-sieving and domestication, which will facilitate domestication and cultivation.
2. Focusing on water production, the ability to cultivate abundant zooplankton and rotifers in ponds is the key to improving the survival rate of the golden scale. Therefore, if the zooplankton cultivated in the original pond is not sufficient in actual production, it should be Collect or purchase supplements from other ponds in a timely manner.
3. To grasp the time of sub-sieving, subdivision and subdivision specifications as many times as possible to cultivate, usually the first sub-screening time is 12 days to 18 days after the seedlings are laid, and the main seedling size is between 2.5 cm and 3 cm. Good, too early or late will lead to a decrease in survival rate. After that, whether to increase the number of times of screening and cultivation or domestication will be decided every 5 days to 7 days according to the uniformity of seedling specifications. The weather conditions during the sifting also need to be focused and should be avoided as soon as possible after rain or rain.
The Techniques of Grading and Breeding of Goldfish Breeding Ponds
In recent years, more and more farmers in the coastal areas of Guangdong have carried out pond culture with goldfish (scientific name: barramundi), but due to the unstable survival rate of fry, usually less than 20%, in addition, seed producers or sellers usually Avoiding this difficult and high-risk key link and directly selling uncultivated and cultivated seedlings to farmers, resulting in difficult aquaculture production expectations and a higher risk of aquaculture.
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