How to achieve high yield in intensive culture of Pelteobagrus fulvidraco

1. pond condition

Intensive high-yield fish pond requires good water source, convenient irrigation and drainage, an area of 1334-3335 square meters (2-5 mu), water depth of 1.5-2 meters, fresh water quality, rich dissolved oxygen, and less silt at the bottom of the pond. Still ponds must be equipped with aerators.

Drain the pond water 7 days before seedling release, and disinfect it with 100 kg quicklime every 667 square meters (1 mu). On the third day, fresh water was injected, and 901 Yuchongjing was used to kill water centipede, tadpole and other enemies, so as to improve the survival rate of Pelteobagrus fulvidraco fry.

2. fry stocking

The yellow catfish fry artificially propagated in Poyang Lake area can reach 1.5 cm in early June, and it is best to temporarily raise them in cement ponds or small soil ponds for 10 days, and then put them into the pond when they reach about 3 cm in summer flower size. During the period of temporary cultivation, red worms and fish meat were mainly fed, and powdered compound feed was mixed in the later period. The stocking amount depends on the pond conditions and the degree of feed protection. Generally, the stocking amount can reach 5000-8000 fish per 667 square meters. Under normal circumstances, after 120-150 days of breeding, tail weight can reach 100-150 grams of commodity specifications, 667 square meters of water surface yield 500-800 kg. Pelteobagrus fulvidraco is gentle and weak in eating ability, so it is not suitable for breeding other feeding fish. In order to regulate water quality and reasonably utilize natural food, it is necessary to polyculture large-scale silver carp and bighead carp species (more than 100 g/fish) with a density of about 200 fish in 667 square meters. The yield of polyculture fish can reach 150 kg.

Before stocking, fry should be disinfected with 3.5% salt solution or 60 mg/L formaldehyde bath for 5 minutes to kill body surface bacteria and parasites. Due to the high temperature, it is best to carry out in a cage wrapped in colored cloth.

3. feed feeding

Pelteobagrus fulvidraco is an omnivorous fish with partial animal feeding habits. The premise of intensive breeding and high yield is to feed a large amount of high quality feed and feed scientifically. 2-4 feeding platforms should be set up and domesticated so that the fish can concentrate on eating at fixed places at fixed times. Before the tail weight is 20g, fish meat is mixed with powdered compound feed, and water is added to knead into a lump for feeding; when the tail weight is 20- 50g, compound feed (or broken fry feed) with particle size of 1.5mm and crude protein content of 35%-40% is fed; when the tail weight is more than 50g, compound feed with particle size of 2.5mm and crude protein content of about 30% is fed.

During the breeding period, strict "four fixed" feeding: one is fixed point. Feed should be thrown on or near the feeding table, do not feed the pond at will, and do not change the position with the fish. The second is timing. Feed 1/3 of the daily amount at 9-10 a.m. and 2/3 at 4-5 p.m. every day for 30 minutes at a time, and feed according to the rhythm of "slow, fast and slow" to avoid nutrient dissolution. Three is quantitative. Daily feeding rate is 3%-8%. Generally, most fish leave the feeding platform after 1 hour after feeding. Four is qualitative. Ensure that the feed is fresh and does not deteriorate. Under the premise of reasonable price, select high-quality feed with high protein content, balanced nutrition, palatability and good stability. Under normal circumstances, the feed coefficient is about 2.5. Wild miscellaneous fish resources are abundant in the lakeside area, which can be mixed with chilled fresh fish meat to reduce the feeding cost.

4. water quality management

Pelteobagrus fulvidraco likes clean water and requires dissolved oxygen in pool water to reach 5 mg/L, most of the time every day not less than 3 mg/L. Due to high density and high protein feed, excreta and residues tend to deteriorate the water quality, resulting in hypoxia and floating, or even flooding. On the one hand, it is necessary to regularly infuse new water and replace old water during breeding to ensure that the water quality is fresh, alive, tender and cool; on the other hand, it is necessary to reasonably use the aerator to make full use of its stirring, aeration and oxygenation functions to avoid low dissolved oxygen syndrome caused by eutrophication in the pool water.

5. Fish disease control

Pelteobagrus fulvidraco rarely occurs in natural waters, but bacterial venereal diseases and parasitic diseases are easy to break out in intensive high-density artificial feeding. Frequent cleaning, removal of bait residues and disinfection of food tables are effective preventive measures. During the feeding period, water disinfection should be carried out regularly, such as sprinkling 0.3 mg/L strong chlorine essence or 20 mg/L formaldehyde, 0.7 mg/L copper sulfate and ferrous sulfate mixture in the whole pool, combined with oral administration of furazolidone (0.5 g per kilogram of feed, continuous feeding for 7 days), which has a better prevention and control effect. If the condition is serious, you can also pull the net together with 50-60 mg/liter formaldehyde bath for 5 minutes. In addition, 15 kg of quicklime is applied every 667 square metres every half month to regulate water quality and prevent the spread of fish diseases.