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I. Selection of Ponds From the perspective of experiments, demonstrations and production practices, when the pond area was between 5 mu and 25 mu, the aquaculture production was the highest, and the aquaculture production was below or above this range. This is because of the small aquaculture area, the poor load buffering capacity of the water body, and the poor aquaculture production; the aquaculture area is too large and the management is difficult, which is also not conducive to improving the yield. The depth is 2.5 to 3.5 meters. Adequate water sources and good water quality are also important guarantees for achieving high yields.
2. Prior to stocking of multi-level fish, 200 kg to 250 kg of quicklime should be used to clear the pond per acre of water. After 3 days to 4 days, 1000 kg to 1500 kg of organic fertilizer should be applied, plus 20 kg of ammonium bicarbonate and superphosphate. Calcium 30 kg to cultivate zooplankton. The following methods can be adopted for fish stocks (taking the climate conditions in Zhejiang Province as an example). In the early spring season, 1200 to 1500 flower (fish bone) fish species are stocked per acre, with 120 tail fishes weighing 50 grams of tail, 80 to 100 tail fishes weighing 300 grams, and a small amount of carnivorous fish. Do not stock oysters, oysters, grass and other fish that compete for food, so as not to cause harm to fish and fish bone fish. This group of fish species can reach the listed specifications (tail weight 250-3000g) in the middle of May when the feed is adequate, and they will be listed and released successively to make room for the water, which will be used as the “fire piece†fish species. "Violence" creates conditions. At the end of May and beginning of June, 500 to 800 fish species with enlarged specifications “fire pieces†will be added. The stocking rate of other matched fish species will depend on the growth situation and the amount of fished and listed. According to experimental observations, in the case of appropriate-thickness, enhanced-feeding fish species that had been replanted in the same year, there were a few product specifications up to the end of July and early August, and most of the products reached the specifications in October and were subsequently caught. . Therefore, stocking should be conducted in late August in order to maintain a general balance of fish species in the water. In the second round of stocking in November, the number, species and specifications of stocking were the same as in early spring. Although the water temperature is lower after November, as long as the fish is kept feeding, the fish species can still grow. Until February to March of the following year, there are still quite a few fish species up to the product specifications, and they can be caught and put on the market, and fish species can be added in time. . Adopting this kind of continuous breeding ponds can greatly increase production and economic benefits.
Third, intensive feeding is mainly to feed artificial diets, fertilization and culture of plankton supplemented by enhanced feeding methods, up to ideal results. Its feed formula is: 30% bean cake, 40% rapeseed cake, 15% sesame cake or peanut cake, 5% fishmeal, 10% flour. After mixing the above several kinds of raw materials, add proper amount of water into the dough or make a soft pellet feed and put it in the food table. The food table is generally made of 5 meters long, 3 meters wide, dense mesh cloth, with bamboo or wooden stakes fixed in the middle of the fish pond, from the water surface of 0.8 meters to 1.2 meters. The number depends on the size of the water surface. Generally, one food station is set for every 4 mu to 5 mu of water. When the water temperature is between 15°C and 20°C, the daily feed is 1% of the fish's body weight; at 20°C to 25°C, the daily feed is 1.5%; at 25°C and above, the feed is 2%. Protein feeds can also be fed. While feeding the feed, it is necessary to fertilize regularly to keep plankton alive. When the water color begins to fade, apply 50 kg to 80 kg of organic fertilizer, 4 kg to 5 kg of ammonium bicarbonate, and 2 kg to 3 kg of superphosphate per acre, so that the transparency is maintained at 30 cm to 40 cm.
Throughout the intensive feeding process, it is also necessary to strengthen the wheel rotation and to maintain the reasonable density of fish in the water to create conditions for multi-level rotation. In addition, catching specifications must be reasonably determined in order to increase the group's output and increase the surface output rate. Flower (fishbone) fish grow rapidly from fry to sexual maturity (body weight 250g to 300g), far more than the average farmed fish, slow growth after sexual maturity. Therefore, setting the catch size of the flower (fish bone) fish to around 250 g/tail can significantly improve the aquaculture production and economic efficiency.
Fourth, fine management First, in the season of fish growth, adhere to the daily patrol pool, observe the water quality and fish activity, find problems and deal with it in time. The second is to adjust the pH of the water body and control the pH to 7.2-7.8. Generally, 40 kg of lime is applied per acre of water, 2 times to 3 times per month. The third is to take a variety of oxygenation measures to maintain good water quality and prevent flooding in pan-pools. Frequently add new water to raise the water level and increase dissolved oxygen reserves. Reasonable use of aerators, in addition to the fish floating head in time to start oxygen, should adhere to sunny noon boot 1 hour to 2 hours to accelerate the upper and lower aquifer convection.
The (fishbone) fish has a long body with a thick section at the front and a flat section at the rear. The body is grayish brown or yellowish. There are many small black spots on the body. There are 7 to 14 dark spots on the side, so the name is flower (bone). It is mainly distributed in rivers, lakes and reservoirs in the Yangtze River Basin. The largest individual is up to 2 kg. It is a medium and small-sized fish with high economic value. The fish has the advantages of beautiful body shape, miscellaneous eating habits, strong adaptability, wide aquaculture range, high group yield, tender meat, delicious taste, and a pretty market. Because the flower (fish bone) fish is delicate, impatient, and intolerant to hypoxia, its breeding, transportation, and breeding techniques are more difficult. At present, domestic farming has not been fully carried out in this regard. With the increase of people’s consumption level, the fish (bone fish) that can only be harvested naturally cannot meet the market demand, resulting in high prices. In recent years, the price has reached 18 yuan/kg to 24 yuan/kg, which is a common fish. 2 to 3 times, the fish cultured (bone fish) can get higher profits. The new multi-level wheeled enhanced feeding technology for fish (fish bone) fish is introduced as follows: