First, fry cultivation
The containers, water, methods, and methods used for artificial incubation are the same as those of other fish. The fry cultivation stage starts from the newly hatched fry with a total length of 2 to 3 cm to a total length of 6 to 7 cm. The incubation time at this stage is about 15 d. The cultivation of this stage is generally carried out in concrete tanks or glass steel tanks. The size of the pool is preferably 1 to 4 m3, and the water depth is 40 to 60 cm. The cultivation density starts at 5000 per square meter. With the individual growing up, the cultivation density is gradually reduced until the larvae end to 2,000 per square meter. During the cultivation, it is necessary to maintain good water quality and the water temperature is stable between 20~23°C, because 24°C is the sub-lethal temperature of the fry and 28°C is the lethal temperature, while the survival rate below 11°C will also be greatly reduced. The dissolved oxygen of the cultivation water should be kept above 6mg/L. The open bait is best used with worms and worms. As the individual grows up, they can gradually increase Artemia nauplii, small horns, and copepods. Artificial feeding is usually 9 to 10 times a day, every 2 hours or so, and every thousand fish fry is fed with 3-5 g of red worm or other small animal feed. From the third day after the larval fish pool began, dietary supplementation with artificial micro-particles was gradually added every day, and the particle size and feeding amount of the micro-particle bait were gradually increased as the fish body grew. The specification of the artificial micro-animal diet is: S1 particle size is less than 250 μm, and S2 particle size is less than 480 μm. The feeding amount was calculated as 0.5-1.Og per 1000 fish per day and fed 10 times a day. The larval rearing period is about 10 days. The first 3 days are fed with S1, supplemented with artificial culture, and the trichoris and Artemia nauplii filtered with 80 mesh sieve; after 4 days, S2 is fed and supplemented with 60 mesh sieve filtration. The copepods and Artemia nauplii guarantee that the amount of biological feed in the trout breeding pond is not less than 1000/ml.
Second, fish breeding
The culturing stage of the fingerlings is cultivated from a larvae with a total length of 6-7 cm to a total length of about 12-20 cm. The cultivation of this stage requires about 15 days. This stage of cultivation can be carried out in outdoor ponds. The required pond area size is 0.2, -0.33hm2, depth of water is 1.5-2m, drainage is convenient, water quality is good, and 1.5kW aerator is equipped. Before the fry are stocked, the pool water is drained first, and the pond is cleaned with quick lime until the efficacy disappears and then stocking. The stocking density was 1000-1500 tails/m2, and gradually decreased the stocking density and the large and small grading rearing as the fish grew, and the density was reduced to 500 fish/m2 by the end of the cultivation. At this point, the adaptability of the fish is relatively strong, the water temperature to be adapted is 2°C to 37°C, and the optimum water temperature is 25°C to 32°C. Before the beginning of the next week, Xiatang should fertilize and cultivate water quality in advance so as to enrich the food organisms in the water body. After 3 days, the pre-cultivated food organisms will be consumed a lot. Soybean milk, bean dregs, etc. should be applied to the pool in an amount of 75 kg/hm2, so that the clumps in the pool can be greatly bred for feeding. It is better practice to use artificially formulated micro-grain bait before the juvenile fish is raised, and increase the bait size every 2 days. The specifications and particle size of the bait are in sequence; the S3 particle size is less than 750 μm and the S5 particle size is greater than 1400 μm. The feeding amount is calculated as 1.5 to 7. Og per day for juveniles of 1000 fish. The feed is fed 6 times a day, supplemented with zooplankton filtered with a 40-mesh sieve, and fed to the artificial compound feed at the end of the cultivation period. The fed amount was 8% to 10% of the fish's body weight and was fed 6 times. In the cultivation process, we must strengthen the feeding and management work. In addition to cultivating water quality and feeding in time, we should also strengthen the management of water quality and remove the enemy pests in time to ensure the survival rate.
III. Disease Prevention
Paddlefish larvae stage prone to enteritis, stomatitis, acne, hydromycosis, etc., in general, as long as the right medicine can be cured in time. Ten to 15cm fingerlings are generally not likely to die. Because spatulae are very sensitive to drug reactions, especially for heavy metal salts, it should be used with caution. When the worms are heavily parasitized, they can be killed by formalin at a concentration of 15% to 25%. When parasitic parasites are found, a formalin bath of 2g/m3 potassium permanganate or 75ml/m3 water can be used. However, the use of copper sulphate and chlorine-containing chemicals is prohibited at the young fish stage; the use of common antibiotics does not exceed 4 g/m3.
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