Technique of polyculture of Pelteobagrus fulvidraco

Pelteobagrus fulvidraco is a benthic omnivorous fish with delicate meat, rich nutrition and high economic value, so it is a cultured species with great market potential. Pelteobagrus fulvidraco has strong adaptability and its growth rate is slower than that of cyprinid fish, but it grows faster for the species itself. the fry propagated in that year can meet the commercial specifications, and the population yield is higher. Because the technology of artificial propagation is not mature at present, there are some difficulties in large-scale artificial culture, so it is imperative to carry out mixed culture. Mixed culture of Pelteobagrus fulvidraco in fish pond has the following advantages: first, it can feed on small miscellaneous fish and shrimp, fish residual bait, organic detritus, zooplankton and so on, so as to increase the net yield of fish pond. Second, Pelteobagrus fulvidraco feeding on parasites such as anchor head in water can reduce the occurrence of fish disease. Third, on the basis of not affecting the yield of the main varieties, the yield of Pelteobagrus fulvidraco was increased by 5 kg ~ 20 kg per mu, and the benefit was more than 100 yuan per mu. The technology of mixed culture is introduced as follows:

I. mixed culture in adult fish ponds

The mixed culture of Pelteobagrus fulvidraco in the adult pond has no strict requirements for the main fish in the pond. Pelteobagrus fulvidraco can be cultured in ponds with four major domestic fish and mainly feeding food fish (such as crucian carp, tilapia, freshwater Pomfret) and other fish ponds. The area of the fish pond is 20 mu ~ 30 mu, the water depth is 2 m ~ 2.5 m, the water source is sufficient, the water quality is good, and the injection and drainage is convenient. Generally, there are 40 ~ 50 yellow catfish per mu, the specification is 3 cm / tail ~ 4 cm / tail, and the income of Pelteobagrus fulvidraco can be increased by 5 kg ~ 8 kg per mu.

Second, mixed culture in parent fish ponds

The mixed culture of parent fish pond can not only make full use of the water space of parent fish pond and improve the utilization rate of parent fish pond, but also eat some small wild fish competing with parent fish for oxygen consumption in parent fish pond. After the end of artificial breeding of parent fish, 40 ~ 60 yellow catfish are released per mu, the specification is 2 cm / tail ~ 3 cm / mu, and the income of Pelteobagrus fulvidraco can be increased by 6 kg ~ 10 kg per mu.

3. Mixed culture in adult crab ponds

Mixed culture of Pelteobagrus fulvidraco in crab ponds can make full use of natural bait biological resources in crab ponds. In general, the area of crab ponds is 30 mu ~ 50 mu, and the coverage rate of aquatic plants is about 50%. After crab breeding, 30 ~ 50 Pelteobagrus fulvidraco are released per mu, with specifications of 3 cm / tail ~ 5 cm / tail, which can increase 5 kg ~ 10 kg per mu.

IV. Mixed culture in river ditches

There are more low-value wild miscellaneous fish in the river ditch, and mixed culture of Pelteobagrus fulvidraco can save artificial bait. Generally, there are 40 ~ 60 fish per mu, with specifications of 2 cm / tail ~ 4 cm / tail, which can increase 6 kg ~ 12 kg per mu.

5. Mixed culture on large water surface

The population yield of mixed culture of Pelteobagrus fulvidraco in large water surface is high, which does not affect the yield of the main species and does not need additional bait. Generally, there are 40 ~ 60 fish per mu, with specifications of 3 cm / tail ~ 4 cm / tail, which can increase 8 kg ~ 15 kg per mu.

No matter what mixed culture method is adopted, the following points should be paid attention to in culture management:

First, keep the water body with high dissolved oxygen. Pelteobagrus fulvidraco has higher requirements for dissolved oxygen in pond water, so mixed culture requires fresh water, sufficient dissolved oxygen, timely injection of new water in growing season, and frequent change of water in high temperature season, such as keeping micro-running water.

Second, keep reasonable stocking density and stocking specifications. According to the feed biomass of the water body, the proportion of mixed culture and the stocking specification should be determined scientifically and rationally. the general water body should be 30 ~ 60 tails, and the stocking specification is 3 cm / tail ~ 4 cm / tail. If the density is too large and the specification is too small, it will not be able to meet the listing specification at the end of the year.

Third, after mixed culture of Pelteobagrus fulvidraco in fish ponds, it is no longer suitable for mixed culture of other carnivorous fishes, and it is not suitable for mixed culture of Pelteobagrus fulvidraco in the culture ponds of freshwater prawns and crayfish.

4. in the process of culture, if the size of Pelteobagrus fulvidraco is found to be too small, which indicates that the biomass of natural bait in the fish pond is insufficient, we can properly supplement small miscellaneous fish and shrimp, summer flowers of domestic fish or feed the specially prepared Pelteobagrus fulvidraco bait. When feeding artificial bait, the main breeds should be fed first (in shallow water), and then Pelteobagrus fulvidraco (in deep water). Pelteobagrus fulvidraco has the habit of sleeping during the day and going out at night, so the bait should be mainly at night.

Fifth, the mixed culture of Pelteobagrus fulvidraco in the crab pond, because the river crab and Pelteobagrus fulvidraco are ecologically in the same water layer, it is easy to cause the competition of their ecological position. Therefore, sufficient natural food organisms must be kept in the crab pond, otherwise the feeding effect of Pelteobagrus fulvidraco will be affected. Can be put in advance in the crab pond 300 kg ~ 400 kg per mu and some crucian carp with eggs, green shrimp holding eggs, let them reproduce naturally for free feeding of river crabs and yellow catfish.