Reservoir cage culture barbed technology

Barbs (Spinibarbus hollandi), commonly known as military fish, belong to the genus Polygonidae, Hypodermis, and Tetrahedron. The body has a long tube shape, with a flat tail, wide head, kiss blunt, and white abdomen. It is a middle-lower fish, hi live in a flowing water environment, lively temperament, good at jumping. The fish is delicious and nutritious, and it is one of the most popular stream fishes in the area. As a new breeding object, it obviously has the advantages of rapid growth, miscellaneous food, high economic value, and great development potential. Artificial breeding of barbed spindock has been quietly rising in Zhejiang and Fujian, and the development momentum is rapid. In 2002, we conducted cage culture experiments in reservoirs in Zhejiang Jinyun and other places, and achieved good economic results. A total of 15 cages were set up, 12,000 fish species were placed, 4 tons of adult fish were obtained, and the production value was 240,000 yuan. The profit was 12 Ten thousand yuan. The relevant technology is introduced as follows.
1. Net cage setup The cage is a double-layer (2 cm inner mesh, 3 cm outer mesh) closed mesh cage sewn with a 33-polyethylene processing net. The cage size is 2m 2m 2m, and the water depth is 1.7m. The effective water body is 6.8m 3 . The cage frame is made of bamboo. At the bottom of the box is placed a steel frame with a side length of 1.9 meters made of steel with a diameter of 12 mm as a sinker; or in the lower corners of the cage, a hanging brick is used as a sinker. The cage is placed in a ventilated, well-ventilated area. The cage is fixed on the big tree or cement pile on the bank by two thick ropes or wire ropes, and is generally arranged in a “one” shape. The cage spacing is 4 meters.
The food platform was built in the box, and the food table for floating feed was made of wooden planks with a box length of 80 cm and a height of 25 cm. It was fixed in the center of the cage and exposed 10 cm above the water surface to prevent the floating feed from floating out of the box. The food table for sink feed is a layer of 40 mesh or more polyethylene net cloth laid at the bottom of the cage. It is folded up 30 cm along the wall of the cage. A funnel is installed in the center of the cage. The diameter is 120 mm and the length is 2 meters. A plastic tube, serving as a feeding tube, is 10 cm away from the bottom of the box and feeds the sink feed to the food table.
2. Before stocking the fish species for stock raising, carefully inspect the cage for damage and false knots, and if there is any aging of the cable, whether the structure of other components is tight and firm. The new cages should enter the water 7~10d ahead of schedule.
Due to barbs, timid scars and panic, it is not suitable for polyculture, quail, tilapia and other lively fish or robbers, so it is generally adopted a single breeding culture. Fish species are generally stocked from January to April. The stocking size is preferably 50~100g/tail, and if the size is too small, it is not easy to develop market specifications. The stocking capacity per box is 500~1000. The fish species to be put in place must be of the same specifications, robust and disease-free. Before stocking, fish should be soaked with 3%~5% of salt water for 10~15min, or soaked with potassium permanganate at a concentration of 20g/m 3 for 10~20min, and 10g/m 3 of poly-ether can also be used. Keto-iodine bathing for 15 to 30 minutes, the disinfection effect is better.
3, daily management barb? Because the original river wild fish, therefore, in the breeding process, the choice of feed and attracting domestication is very important. Barbs usually start to feed at a temperature of 13°C, eat well at 25 to 30°C, grow fastest, and have a temperature range of 20 to 30°C. After the fish species is stocked, when the water temperature rises above 13°C, it is necessary to start feeding. If the fish species are already domesticated, they can directly feed the full-price compound feed. The crude protein content of feed is required to be 32% to 35%, and animal protein accounts for 25% to 30% of the total protein. If it is a species of fish directly caught in the river, it must be tamed. At the beginning, it feeds its favorite quail, maggot, squid feed, or bait used for fry cultivation, and then gradually increases the artificial full-price compound feed. According to the eating habit of barb, feeding 2 to 3 times a day. The amount of feeding depends on the weather, the temperature of the water, and the feeding conditions of the fish. In general, the daily feeding amount is 1% to 6% of the fish's body weight. When the water temperature is higher than 30°C, the food intake is significantly reduced and even the food is stopped.
In order to provide barbs, full nutrition for growth, improve the appearance of commercial fish and maintain its natural meat quality. Based on its omnivorous characteristics, we also fed some green fodder, such as ryegrass, corn leaves, pumpkin leaves, sweet potato leaves, mulberry leaves, duckweed, and other plant debris, as well as cocoons and snails, in addition to compound feed. Meat, wild fish, and other animal feed, to achieve sophisticated matching, artificial feed and natural feed combination. With the growth of fish, barbs gradually favored eating plant foods, then timely adjustment of feed formulations, plus cast green feed.
Day-to-day management must be done on a regular basis, especially in flood seasons, to prevent fish trapping caused by rodent clothing caused by rodents, ferocious fish, aquatic animals and floods, and to clean the nets regularly; Carefully patrol the tank and observe the fish's feeding and growth. In particular, during the feed conversion process, special attention should be paid to the fish's diet. The water quality of the reservoir is good. At the same time, strict disinfection of fish species, food tables, and production supplies, and feeding fresh, palatable feed at ordinary times can prevent diseases. Even if there are fish diseases such as hydromycosis, bacterial disease, gill disease, and enteritis disease, they can be treated according to other fish treatment methods.

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