Cage cultivation technique of black fish fingerling

1. Stocking density: generally put 3 cm summer flower fish fry 600 million 700 pieces per square meter, out-of-box specification is about 6 cm 8 cm. The summer flower fish species must be strictly separated and screened, so that the specifications are the same, and the stocking density should be properly adjusted according to the size of the specifications.

2. Feed and feeding: the bait of summer flower fish is still dominated by zooplankton. If the water-producing earthworm areas or autotrophic earthworms, maggots and other animal bait, can be used as summer flower fish feed. Use polyethylene mesh in the cage to set up a food table, 15cm below the surface of the water, for feeding and storing residual bait. The dead water fleas should be fed in hanging bags of about 500 grams per bag, and each bag can feed 600 fish and 700 fish. After that, as the fry grew, it gradually increased, about 250 grams in a week. In principle, the number of bags per bag is less and the number of bags is more, so as to increase the dispersion of fish fry during feeding, promote the uniform feeding of fish fry, improve the feeding effect, and reduce rigid and weak fry. If you feed other animals, you can chop it into appropriate size and scatter it on the table. From then on, the domestication of "signal" call before feeding can be carried out, such as playing music, electric bell, clapping and other signals to start feeding. After hearing the signal, the fish fry will focus on waiting for feeding near the food table, so it is easy to form a situation of grazing, feeding is good, the feed utilization rate is high, it is not easy to lose in the cage, the fish species grow fast, and the feeding amount is easy to be controlled. at the same time, it is easy to observe the health status of fish species and other advantages. When the fish fry is more than 4 centimeters long, the above kinds can be replaced with minced fish meat. If the compound feed is used, it will be domesticated from this stage. The domestication method is as follows: before zooplankton (or water earthworms) alternate with minced fish, the two kinds of feed are mixed in different proportions and then fed, and the feeding method is the same as before. In the future, the proportion of minced fish will be gradually increased until all minced fish are used. Domestication takes about 3 to 4 days and will soon get used to it. 3. Brush the box regularly: brush the box every morning to prevent dirt and parasitic filamentous algae from sealing the eyes of the box, affecting the exchange of water inside and outside the box, resulting in malignant change of water quality and lack of oxygen. Remove the residual bait and clean the table every day to prevent the residual bait from accumulating and spoiling. Change the cage every other week, thoroughly clean and disinfect the replaced cage, dry it and then use it. Sieving and culturing the fish in the box at the same time, so that the specifications of the fish in the box are the same, so that after 3-4 weeks of culture, the size of the fish can reach 6-10 cm, which can be released as small-size fish, and further cultivate large-size fish species or adult fish culture. 4. Patrol the pond: patrol the pond twice a day in the morning and evening, observe the activity, food intake and water quality of the fish, make a good record, and put forward measures to solve the problem. At the same time, we should pay attention to whether the cage facilities are affected by wind, water flow, manual operation, etc., such as broken rope, floating at the bottom, etc., should be repaired in time, otherwise it will cause serious death. Finally, we should do a good job of handing over the shift.