Rainbow cocoon cage high-yielding culture method

Rainbow cocoon cage high-yielding culture method

The rainbow trout, also known as red tilapia and red hogfish, is a hybrid crossbreed of Nile tilapia and Mozambique mutant tilapia. It has many advantages such as wide feeding, rapid growth, strong disease resistance, and low oxygen tolerance. With the use of reservoir cages for breeding rainbow trout, local breeds can be adjusted to optimize the culture structure and improve the production efficiency of reservoir water bodies. Through our breeding experiments in recent years, it is necessary to grasp the following technical essentials to achieve high yield and high efficiency of cage breeding in the Rainbow Cang Reservoir: 1. Reservoir conditions should be suitable for reservoir cage culture Rainbow should choose leeward sunny, open water, stable water level, Fresh water, non-polluting water sources and convenient transportation areas require the dissolved oxygen in the water. The pH is 7.2-8.0, and the water depth is 4m-5m. The reservoir water conservancy facilities are complete and are not vulnerable to flooding. Rainbow trout is a tropical wide-salinity fish. It has strong adaptability to the environment. It can also survive in fertilizer and water and low-oxygen water. Its tolerance to temperature is stronger than other tilapia of its genus. The minimum temperature for its survival is At 4°C, the maximum temperature is 42°C, the appropriate temperature range is 20°C to 35°C, and the optimum temperature is 25°C to 34°C. When the temperature falls below 16°C, little or no food is consumed. Therefore, the water temperature should be kept between 20°C and 35°C and the salinity should be around 1.4. Second, the production of cages to be fine cages should be made of polyethylene material, double structure, the interior is a non-section cage (closed), the outside is a nodule cage (open type), cover the net for Single layer, mesh size 1.5 cm to 2.5 cm, size 6 m 6 m 2 m. The frame of each cage is made of 4 bamboos 8 meters long and supports the entire cage. The long stones are used as sinks and knotted under the four net angles below the cage to make the cage full in water. Expand shape. The cage was fixed with a cable and a polyethylene rope with a diameter of 4 cm. The rope straddled the water surface. After straightening, it was fixed on the pile by the shore. The distance between the two cables was 8 meters. After the cages are fixed by cables, they are arranged in a “one” shape on the surface of the water. The upper side of the cage is 20 cm to 30 cm above the water surface. Net cages should be installed 10 days before the fish species are put into the tank to allow the nets to attach to the algae. After the fishes are put into the tank, the nets can be avoided to scratch the fish body. Third, the fish stocking should be reasonable cage breeding rainbow trout high yield guarantee must be stocking large-scale species, tail weight more than 200 grams best. The stocking of rainbow trout requires a neat scale, bright colors, complete fins, no flakes, no injuries to the body surface, a robust body, and a lively swim. The stocking time is around mid-May and the water temperature is stable above 20°C. The amount of stocking is from 5,000 to 6,000 fish species at 150 g/tail to 200 g/tail. Before the fish species enters the cage, they are bathed with salt water with 3 to 4 salt for 15 minutes to 20 minutes. Fourth, the feeding of feed should be carefully prepared. The rainbow trout has a very wide appetite. It is an omnivorous fish mainly composed of vegetable feed, and it is very bulimia and has a large food intake. Under the cage culture conditions of the reservoir, it is advisable to feed the full-price compound feed and assist in feeding green feed. The formulation of the full-price compound feed is: fishmeal 30%, bean cake 20%, flour 15%, corn flour 15%, bran 15%, yeast 2.5%, mineral 2%, vitamin 0.5%. The content of protein in feed must reach 35% or more. The feed particle size is 2 mm to 4.5 mm. Green fodder can be fed L. edodes, bitter herbs, valerian, etc. to supplement the lack of vitamin C in the feed. The rainbow can be fed 2 days to 3 days after entering the box, and it should be domesticated before feeding. According to the “slow-fast-slow” rhythm and the “less-more-less” feeding amount, it is domesticated for 1 hour per day. -1.5 hours, continuous domestication for 10 days, until most fish can go up and grab food, they can be fed normally. The amount of daily feeding is 5% to 8% of the total weight of the fish body, which is fed 3 times to 4 times per day, and each feeding is performed for about 0.5 hour to 1 hour. The majority of the fish are fed and walked for degree. The amount of each feed should also be properly adjusted according to changes in water temperature, weather changes, fish ingestion and activities. In the feeding method, we must pay attention to the "four principles" principle. Rainbow quail grows faster when the water temperature is between 25°C and 34°C. It should increase the amount of feeding, and reduce feeding or stop feeding when it is rainy, hot, thundery and other bad weather. Green fodder can be fed once a night, sterilized with 1% bleach and put into cages. The amount of feed should be based on the next day. Fifth, daily management should be strengthened 1. Adhere to the inspection box to adhere to the daily inspection box, regular inspection of fish growth, reasonable feeding, careful observation, analysis of fish, find problems in a timely manner, and do a good job in cage culture log, record daily water temperature , feeding, feeding, dead fish and disease conditions. 2. Diligently brush the box every 10 days to 15 days to wash the cage once, remove residual baits, dirt and algae, so that the water exchange. 3. Check the box regularly to check the cage regularly and find that the damage is repaired in time to avoid fish escape or ferocious fish entering the box. In the flood season, we must also check the strength of the ropes, whether the ropes are firm, and whether the nets are deformed. 4. Regular adjustment of the tank With the fluctuation of the water level of the reservoir, the cage must be adjusted to the appropriate depth of water depth and water quality. Sixth, fish disease prevention and treatment should pay attention to fish species before entering the box to use saline to dip, but also regularly disinfected, fed once every 10 days bait once, and even fed 3 days to 5 days to prevent the parasite breeding fish. Every 10 days to 15 days, each cage is sprayed with quicklime 150g to 200g of pulp and hot water to purify the water. Use pesticides and bactericides every month. In addition, green feed must be sterilized before feeding.

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