What are the techniques of guppy breeding?
Chinese chuatsi fish adult culture is to raise 3-centimeter Mandarin fish fry or 6-8-centimeter fish species into commercial fish weighing about 500 grams. This process takes about 180 days. The length of rearing time depends on whether the bait fish are sufficient and palatable, whether the water quality is good and whether the management is proper. At present, the main ways of breeding are ponds, adult fish ponds (small reservoirs), mixed culture, net box culture, etc. 1, ponds, Mandarin fish
1. Pond conditions: the requirements of the pond bottom is hard, less silt, close to the water source, drainage and irrigation is convenient, there is no sewage inflow of domestic and industrial sewage, there is no equipped with bait fish ponds should not be too large in size, generally 1-3 acres. Under the condition of equipped with bait fish ponds, the area of 2-5 acres is appropriate. Before stocking, the pond should be cleared and sterilized by conventional methods to kill various disease organisms and pathogens. After water injection, 1-2 days before Mandarin fish fry are stocked in the pond, splash the whole pond once with 0.7PPM copper sulfate and ferrous sulfate combination (5:2) to kill water parasites, so as to improve the survival rate of Mandarin fish (especially summer flowers).
2. Disinfection of fish species and bait fish: stocked Mandarin fish species and hitchhiking varieties of temporary containers with 3PPM copper sulfate solution or 3% saline or 20PPM potassium permanganate solution immersion for 5-10 minutes, regular feeding of bait fish are also disinfected with this method, to prevent pathogens from the stocking of fish species and bait fish into the aquaculture pond.
3. Stocking methods: At present, the following three stocking methods are commonly used:
(1) Direct stocking of 3cm Mandarin fish species. To local Siniperca chuatsi summer flower breeding one year into commercial fish, Guangdong Siniperca chuatsi summer flower can be marketed that year. Stocking density of about 2,000 tails per mu, pre-culture methods with the same pond cultivation of Mandarin fish species, later feeding bait fish-based. This method is easy to work, saving labor and ponds, but due to the small size of the fish stocking, the survival rate is generally only 50%, poor grasp.
(2) Stocking of 6-8 cm large-size Mandarin fish species. This method is adapted to the breeding of larger farmers, generally mu put 1000-1200 tails. The advantage is that the survival rate is higher, usually 85-90%, and the production is more certain.
(3) stocking of one-year-old Mandarin fish species, specifications 50-100 grams / tail, about 500 per mu stocking, stocking specifications require basic consistency, acres of about 200 tails of flowers, silver carp, 200 tails of the old mouth of silver crucian carp, it is not appropriate to take the grass carp, cyprinid, carp, etc., the use of the winter to acquire a small species of fish stocked temporarily in the pond.
4. Feeding method: feed fish feeding Mandarin fish feed fish sources of captive and wild fish collection, the requirements of the bait fish a live, two to the size of the mouth, three is no hard spines, four to supply timely, to try to meet the above requirements in order to achieve good results.
(1) feed fish species, all small fish and shrimp without hard spines and small loaches, can be used as bait fish for Mandarin fish, but from the source, economic, preferred food and other considerations, you should choose pangolin, crucian carp, silver carp, bream fry better.
(2) The specification of feed fish should be fed according to the different growth stages of Mandarin fish.
How to improve the survival rate of fish fry transportation?
Improving fry transportation technology is the first and foremost foundation for successful aquaculture. Fry transportation is very important in aquaculture production, because the fish fry relative to adult fish, weak sex petite, weak vitality, resistance to adversity and disease resistance is poor, it is very easy to die in the transportation. The main reasons for the death of fry in transportation are hypoxia, fish body damage and bumps in the road, changes in water temperature more than the tolerance level of the fry and so on. Combined with the actual production talk about how to improve the survival rate of fish fry transportation for reference:
1. Fish fry fishing, sampling to do a microscopic examination of whether there are parasites, and do the appropriate treatment in a timely manner.
2. 1-2 days before shipment, stop feeding, can make the fish body feces discharge clean, reduce the metabolic rate of the fry, so as not to discharge into the transport container pollution of water quality.
3. The day before the transportation, pull the net intensive exercise, accelerate the excretion of feces and enhance the fry's ability to resist stress, in order to create more favorable conditions for the transportation.
4. For the fry to be transported, it is required to choose the fry that are robust, disease-free and injury-free, and pull the net one day in advance to suspend water in the net box, strictly sieve the fish species with a sieve, eliminate the wild fish, and ensure the same specifications.
5. The water used to transport the fry, if it is non-polluting, fresh river water, well water or reservoir water can be required, the water temperature must be basically the same as the water temperature of the fish breeding pool, such as the use of tap water, to be properly de-chlorinated before use. In the transportation, we should pay attention to the temperature change at any time, and make appropriate preparation for warming or cooling.
6. The density of fry transportation should be considered in conjunction with the local climate, water temperature, transportation time and the species and specifications of the fry.
7. Fry transportation methods: fast and effective, light and smooth, properly planned, as sparse as possible.
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