When the black mullet larvae emerged from the egg membrane, their individual development was still incomplete. It was very delicate and difficult to manage. The specific manifestations were:
1 Wuxie seedlings are easily affected by waves, currents, etc., and they adhere to the gauze and die;
On the evening of 2 nights, colony inhabitation is likely to cause hypoxic death;
3 No scales on the body surface are easily injured and infested with protozoa (triflipids, small melons, slugs, etc.);
4 When dead eggs and dead seedlings are corrupted, a large quantity of harmful substances and oil beads are released, contaminating the environment of water quality. Therefore, when breeding in a cage or in an incubator, fry can be changed to a large cage or directly to a lower pool when the feeding activity of the fry is normal.
1, the fry of the mouth cited.
The mouth-opening bait of Wuxmiao seedlings is a small zooplankton (rotifers, small otters, etc.) whose individual size is controlled below 200 microns. Can be fertilized in advance in the fry cultivation pool. If the amount of zooplankton is insufficient, the zooplankton captured by the 100-mesh plankton network can be filtered through a 40-60 mesh gauze cloth, and the filtered filtrate contains a large amount of microzooplankton. Add a small amount of oxytetracycline to the filtrate and feed it after 30 minutes. Normally, it is fed 6 times a day, that is, once every 4 hours. It is based on the principle of eating less and more meals. After 3-4 days, with the growth and activity of the fish The ability to increase, the gradual increase in the amount of feeding and the number of reductions, until feeding 2 times a day.
2. Disperse the clusters in time.
Especially after 1 to 7 days after filming, the phenomenon of clustering is more serious, and the cluster will cause hypoxia in the local area, causing dead seedlings. Therefore, it is often necessary to use a tool such as sea fishing to gently stir the water to disperse the seedlings and increase the survival rate.
3. Strengthen water quality management and keep the water body fresh.
Timely removal of dead dead eggs to prevent its decay and spilled oil balls, resulting in poison and oil film; cages should be regularly brushing, sewage. The cement pool should be regularly suctioned and drained. The ideal is to use microfluidic water for cultivation. Soil pond nursery should regularly change the water and gradually increase the amount of water. The temperature difference between the new water temperature and the original original pool water temperature does not exceed 2°C, and the water exchange volume is generally controlled at 60%-70%, and can be reduced to 30%-50% after two weeks. The water change time is controlled according to the change in water quality. Change the amount of water.
4, disease prevention measures.
When the fish just emerged from the membrane, it was easily infected with aquatic molds and protozoa (trichophathoxes, small melon insects, slug worms, etc.). After the fry were completely out of the membrane, the egg membranes were promptly removed and shed with 1-2 times of 15 ppm formalin. Prevent it. The fresh water that is exchanged daily is best to be pre-sterilized with 15-25 mg/liter quicklime in a water storage tank or with a chlorine preparation.
5, timely education.
The fry can grow to about 2.5-3 cm after 3 weeks of culture. Different fry sizes will kill each other, strengthen the food, and increase the relative density. As a result, the incidence rate will increase. Therefore, after every three weeks or so, grazing will be carried out once and gradually, the stocking density will be gradually reduced, and the size will be evacuated. Fish breeding ponds go.
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An API starting material, usually a defined chemical property purchased in the market place or produced in-house, is used in the production of an API.
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