There are three stages of mandarin fish culture cycle, seedling cultivation, fingerling cultivation and adult fish culture.
Mandarin fish culture cycle is mainly divided into fry cultivation stage, fish fingerling cultivation stage and adult fish culture stage. Seedling cultivation stage: artificial labor induction and artificial hatching. Fish breeding stage: after the mandarin fry comes out of the film, the egg membrane and dead eggs and other dirt should be screened out with a sieve, and then reared in ponds according to the size of mandarin fry. The stage of adult fish culture: feed reasonably, control stocking density and actively prevent diseases.
I. the stage of cultivating mandarin fry
The environment in the stage of cultivating mandarin fish fry is very important, the water quality of fish ponds should be light and not muddy, and some submerged water plants should be placed at the bottom of the pond. Acid ponds and relatively muddy pond water can not cultivate mandarin fish fry. Before putting mandarin fish fry, the fish ponds should be sterilized, and then some cultivated water can be used to cultivate bait fish.
Second, the stage of seedling cultivation
In order to carry out artificial labor and artificial incubation, the period of artificial labor is generally from April to September, and the amount of drugs used to induce labor should also be used according to the weather, water quality and moisture. During the incubation period, special attention should be paid to the water temperature, the water quality requires sufficient oxygen content, and the flow velocity should be maintained at 1-2 meters per second. The newly hatched mandarin fry is only about 4mm in length, and can grow to about 30mm after artificial cultivation.
III. Fish fingerling cultivation stage
After the mandarin fry comes out of the film, it is necessary to screen out the egg membrane and dead eggs and other dirt, and the fry in this period can only swim up and down, not parallel, so it is necessary to prepare live fish that have just come out of the film as bait fish, such as Thai dace, wheat dace and so on. Need to change water disinfection every day to keep the cultivation pond clean, disinfectant is better with crude salt and dibromohydantoin.
Mandarin fry should be cultivated in ponds according to size. In about 12 days, mandarin fry can grow to 4cm or so. At this time, mandarin fish that reach 4cm need to be classified and sold.
IV. Commercial mandarin fish culture
Commercial mandarin fish culture mainly pays attention to feed management, stocking density and disease prevention. Mandarin fish are carnivorous fish, so it is necessary to prepare mayflies such as small fish and shrimp, but in order for mandarin fish to grow more comprehensively, we should also put an appropriate amount of feed, but every time we put the feed, we should fish out the residual feed from the last feeding to prevent and cure the disease caused by accidental ingestion of mandarin fish caused by decomposition in the pool.
5. Suggestions
Mandarin fish have a strong ability to arrive in Hangzhou and will not get sick in general, but there will be a large number of parasites and bacteria in the process of culture, so we should disinfect the ponds regularly to understand the bacteria in the fish ponds to prevent and control the diseases of mandarin fish.
The density of mandarin fish culture is also a key point that can determine the survival rate of mandarin fish. Generally speaking, only 1000-2000 mu of fish fry can be put in one mu of ponds. If you put too much fish fry, it will not be easy to manage and cause fry death. Therefore, the number of mandarin fish per mu should also be controlled within a certain range.
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Water quality regulation and stocking density are the key points for mandarin fish culture.
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