Light fall? Pond culture techniques [barbs?]

The light barb (spinibarbus hollandioshima) is a Fish belonging to the family Kopaiako in terms of classification, and the local names are Jianyu, Huang Jian, and Keng Jian. It is one of the main economic fishes of Guangxi's Lancang River and Guijiang River. Before the 1970s, the Minjiang River was barbed, and the catch of rivers was second only to carp. Since the 1980s, due to the influence of dams, water pollution, and electricity, poison, and explosions, the catch of rivers has dropped sharply. Especially in recent years, due to the sharp drop in the number of products, the price has risen sharply. At present, the body weight is more than 500g, and the market sales price reaches 50 to 60 yuan. Under the drive of such high profits, the phenomenon of exhausting fish and fisheries is even more serious. River resources are endangered. In order to protect and exploit this fine variety, we undertook the scientific research project of "Light Barb? Pond Culture Technology" issued by Guilin Science and Technology Commission. This article analyzes the test results of the project, aiming to provide a basis for exploring and exploring the techniques of breeding fish. First, materials and methods 1, pond conditions. The three fishponds used for raising light barbs {fish and fish} are all square. Except Yanshang District No. 3 pond, it is expanded with cement stone, and the other two fish ponds are Tugutang. The bottom of the pond is 10-15cm thick, and the pond water is used for mechanical irrigation. The average water depth is 1.9-2. Lm, water quality pH 6.7, transparency about 30cm. 2, fish pond disinfection. In the 15 days before the fish ponds, each pond (1m water depth), with tea bran 80kg with water disinfection, fish species under the pond 2 days before, using Squid to test the water, prove that the toxicity disappeared before the fish. 3, the source of fish. The fry mainly comes from the wild light barbed {fish & fish} fry in the Minjiang River. In the first stage, 2-3cm wild fry were collected from September to October 1999 for intensive cultivation in small cages. The second stage was to grow into ponds when the fry were 5-6m long. When the species grew to more than 15cm, the body weight was increased. About 100g or so will be transferred into the adult fish culture stage. 4, fish stocking. A healthy fish species weighing more than 90g was selected as the adult fish culture object, and the fish species were not sterilized before being placed under the pond. Restocking time; Nine Yangqiao 5# pond is April 29th. 3# pond is May 8 and Yanshan District 3# pond is May 12th. 5, feed. The first stage fry size 2-4cm due to young fry, generally use more than 40% of crude protein broken material, can also be used carp feed, feed 4 to 5 times daily, the amount of food for the fry is enough, generally 10 %-15%. The second stage finger size 5-15cm feed crude protein content of about 35%, feed particle size 1-2mm, mainly crushing material, feeding 3-4 times a day, fed 8-10%. The third stage is the adult fish breeding stage, the specifications of 15cm or more, the feed crude protein content is about 3O%, the feed particle size can be gradually changed from 2mm to 4.5mm according to the growth of the fish, daily feeding 2-3 times, Feeding amount 3%-6%. 6, daily management. During the fry aquaculture stage, attention should be paid to the observation of fish feeding conditions, paying particular attention to the caliber of the fish and the feed particle size. During the adult fish breeding stage, fresh water quality should be maintained, and fresh water should be injected l-2 times a week to make the transparency of the pond water more than 30cm. During the entire breeding period, the quality of the feed should be ensured so as not to affect the normal growth of the barb. Second, the results and summary 1, the output results. Three test fish ponds, covering an area of ​​21 mu, after 220 days of feeding, the total output of fresh fish is 1,2782.4 kg, and the average yield of fish per mu is 608.6 kg, of which, per mu light barbed {fish and fish} 471,6 kg, carp 60 kg, carp 65.5 Kg, 11.5kg of grass carp, accounting for 77.5%, 9.8%, 10.8%, 1.9% of the total output, respectively. 2, light down {fish] out of pond specification, survival rate and net weight gain. According to the analysis of harvested fish, a total of 18543 tails of the barbed {fish} were harvested, and the average survival rate was 92.26%; the total light production barbed {fish and fish} was 9904.1kg, and the group had a net weight gain of 7995kg, and the individual net increase was Weight 439g; Average Outlet Size 534.1g, Maximum Body Weight 0.85kg, Maximum Individual Length 43cm, Body Length 37cm, Height 9.9cm, Ratio of Overall Length to Body Height 4.34, Body Length to Body Height Ratio It is 3.73; the smallest body weight is 0.2 kg, the smallest individual has a total length of 25.5 cm, body length is 21.5 cm, body height is 5.0 cm, the ratio of full length to body height is 5.1, and the ratio of body length to body height is 4.3. 3, light barbed {fish fish} diet observation. According to experimental observations, light barbs {fish and fish} are omnivorous fishes, which is consistent with Chen Zhenyu's findings. In the seedling stage before 2cm, mostly aquatic organisms are the staple foods. When the body length is more than 2cm, they can ingest high-quality mixed feeds with good nutrition and good palatability. This phase is also the best stage for artificial domestication. When the body length is more than 5cm, you can eat pellets that are suitable for its caliber. At the adult fish breeding stage, artificial pellet feed is mainly used, and appropriate amount of animal waste and high-quality green fodder (pakchoi) can also be fed to promote light barb growth. During 22 days of adult fish farming, 29 tons of pellet feed was fed and the feed coefficient was 2.85. Higher feed ratios may be related to feed quality. 4, economic benefits. According to the analysis of production records, light barbed {fish} fish ponds into the acre of 7888. L Yuan, including 3O36 Yuan for fish species and 3645.7 Yuan for feed, which accounted for 38.48% and 46.21% of the total cost respectively. The per mu output value is 1,5733.6 yuan, the mu profit is 7873.9 yuan, the input-output ratio is l: 1.99, and the cost-profit rate is 99.82%. It is a project with high input, high output, and high efficiency. In summary, light barbed {fish & fish} body meat and fat, meat and more delicious, mixed food, strong adaptability, good market prospects, is a good variety of development prospects. However, due to limited testing time, the breeding technology of light barbs should be further improved. In particular, the biological characteristics of gonadal maturation and oviposition breeding of light barbs need to be further studied in the future.

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