Squaliobarbus curriculus is a freshwater, warm-water fish, belonging to the genus Polygonidae, Yalobrinidae, and Trichoglobranus. It is suitable for ponds and reservoirs due to its adaptability, rapid growth, miscellaneous feeding habits, and easy feed settlement. Such as the proliferation of various types of water, and its delicious meat, rich nutrition, it has been people's attention, is expected to become a new type of freshwater famous breeding object.
1. There are two main sources of broodstock for broodstock to be used for artificial propagation: one is to fish from the Xihe Reservoir, select large individuals without injuries to be kept as broodstock, and the second is to choose from artificially raised commercial fish. The criteria for selecting broodstock are: a sturdy physique, no injury-free disease, preferably a sexually mature individual over 2 years of age and weighing more than 0.75 kg. The ratio of male to female is 1:1.3. To prevent germplasm degradation and mating. It is best to use wild red-eye turtle as a reserve parent.
2, broodstock broodstock cultivation area of ​​1200 to 2000 square meters is appropriate, soil pool can be, water depth of about 1.5m, adequate water, drainage and irrigation facilities. Disinfection should be done before clearing. The stocking density is controlled at about 150-200kg/667 square meters, with a small amount of cockroaches, squid and carnivorous fish to control the water quality and clear the wild fish. The broodstock breeding is mainly fed with compound feed, and the feed crude protein reaches 30 About %, the daily feeding amount is 3% to 5% of the fish's body weight, depending on the water temperature and broodstock feeding conditions, and appropriate amount of green feed, and strive to nutrition balance. Weekly infusion of new water after spring, and increase the amount of feeding. Two months before delivery, management should be strengthened and water should be flushed every day to stimulate the development of gonads.
3, artificial oxytocin and hatching in the breeding season, when the water temperature is stable above 18 °C, select the sexually mature broodstock for oxytocin production. Female mating fish with good maturity have enlarged and soft abdomen, swollen reproductive reddish red pores, and obvious ovarian contours, while males generally have light pressure on the abdomen with semen outflow. Using an external hormone such as LRH-A2 for intraperitoneal injection, the male dose was halved. Then the cuddling fish after the aphrodisiac into the urine production pool, water stimulation, let it natural mating spawning, as long as the broodstock development and maturation, can get better oxytocin effect. When the water temperature is 21 ~ 26 °C, the effect time is 10 ~ 12h. Eggs produced by the red-eyed oystercatchers enter the collection box from the urine production tank, and then transfer to the ring road or hatching tank to incubate. Incubation time should be strengthened to ensure that the water is fresh and the water flow is smooth. About 3 days after the larvae appeared out of the membrane, the waist spot appeared and was turned into a mixed nutrition stage. At this time, the open bait could be fed or transferred to an outdoor pond to cultivate summer flowers.
4, seed cultivation
4.1 Seed cultivation ponds General cement ponds or earth ponds can be used to cultivate red-eye bream seedlings, but it is required to be convenient for water intake and drainage, and to have good water retention and fertilizer retention performance without leakage. Summer flower cultivation pond area is generally about 100 to 600 square meters, winter pool area can be slightly larger, with 600 to 1200 square meters is appropriate. All kinds of cultivation ponds are cleared thoroughly with lime prior to use. In the pond 4 to 5 days before the pond, water injection 50 ~ 60cm (60 inlet filter bag should be set to prevent wild miscellaneous fish and other aquatic enemies into the pond), and applied to 667 square meters of pond decomposed manure 200 ~ 300kg, to cultivate plankton, so that the pond has a palatable rich bait. Because of the small cracks in the eyes, the basal fat should not be fed too early.
4.2 Poplar stocking The seedlings should be tested on the day before the seedlings are released to detect whether the toxicity of the drugs in the clear ponds has disappeared. At the same time, the eyes of the fish ponds should be pulled 1 to 2 times with the dense eyes to remove frog eggs, cockroaches or other predator organisms. The time for seedlings is generally selected on sunny mornings; if out-of-the-water sprays are purchased, the nylon bags containing seedlings should be immersed in the pool water for 0.5 h to adjust the temperature difference. Red-eye 鳟 water is very delicate, and the operation should be very careful, and the temperature difference between the seedlings should not exceed 2°C. The stocking density depends on the conditions of the pond and the level of farming techniques. Generally, the stocking rate is 100,000 to 120,000 per 667 square meters.
4.3 Feeding management The pond began to sprinkling soymilk on the same day. For every 667 square meters of water, dry beans are used 3 to 4 kg per day. After two rounds of refining, the whole pool is splashed. In the middle and late stages of summer flower cultivation, top-dressing is performed according to the quality of water, and the amount of soymilk is gradually reduced, and powdery concentrate is added ( Such as sub-powder, fine clams, etc., the amount of feeding, generally every day 667 square meters of water cast 2 ~ 3kg, to ensure adequate feed for fry. During the entire nursery period, attention should be paid to the management and control of water quality. Generally, as the fry grows, new water is often injected to gradually increase the water level. When the water quality is late in the nursery, the water level is added to the highest level to ensure that the water quality is “fat, live, and coolâ€. Routine management must adhere to two weekly patrols in the morning and evening to observe fish fry activities, food intake and water quality changes, and find out that the problem is solved in a timely manner. After being sprayed for 20 to 30 days, the water spray generally grows to a length of 3 to 3.5 cm. At this time, it is necessary to sell it in time or divide it into ponds and transfer them to the breeding stage. For long-distance transportation of summer flowers, 2 or 3 pull-net exercises are required before leaving the pond. However, care must be taken to avoid injury as much as possible in order to increase the survival rate of out-of-pond and transportation.
The cultivation of winter stalks is basically similar to the cultivation of summer flowers, but the stocking density is controlled at about 10,000/667 square meters. In addition, with the continuous growth of seedlings, compound feed and appropriate amount of green feed (such as duckweed and rotifers) are also to be fed. Etc.) As long as the feed is adequate and the water quality is good, the size of the summer flowers cultivated by the red-eyed oysters will reach 12cm or more by the end of the year. It can be used as a fish species for cultivation in the following year.
5, adult fish cultured T. erythematosus strong adaptability, no special requirements for water quality and more resistant to hypoxia, and thus suitable for polyculture or pond main support.
5.1 Polyculture All types of ponds, ponds, reservoirs, reservoirs, and other types of water in which conventional species are farmed can be mixed with red-eye turtles. The number of polycultures is generally 50 to 200/667 square meters (approximately 12 to 15 cm in size). The red-eye turtle is an omnivorous fish that can ingest a variety of feeds, so it does not require special feeding management or feeding special feed. However, due to the good eye jumping in red eyes, it is necessary to pay attention to the prevention of jump and escape, especially at the water injection port to stop fish facilities.
5.2 Ponds The main ponds that raise the main red-eyed oysters should have a depth of 1.2 to 1.5 m and an area of ​​1000 to 2,000 m2. They should thoroughly clear the pond before stocking and apply sufficient basal fertilizer. According to pond conditions. The main pond can store more than 12cm per 667 square meters of winter fish with 800 to 1200 red-eye fishes. It can also be used with about 10% of oysters, oysters, clams, and a small amount of carmine, etc., but the main pond does not generally match. grass carp. Because grass carp eats fierce, it will affect the growth of red-eye turtles. If the pond is more fat, the proportion of squid and squid may be appropriately increased. The main pond can be fed with feeding and fertilization. If the feed is pellet feed, the crude protein content can be around 25% to 28%. At present, there is no special compound feed for the eyelid. Normally, tilapia or grass carp and bolete may be used instead. However, it is not possible to use a feed for a long period of time. In addition, regular amount of green feed must also be fed to ensure nutritional balance. Day-to-day management is also to insist on daily inspection of the pond, to understand the growth of the grasp of the fish's food intake, to achieve "four sets of" bait, summer season hot water injection, to ensure water quality "fat, live, tender, cool", in addition to prevention Disease, escape prevention, defense against enemy and other work.
6. Disease prevention and control According to the observation of breeding for two years, the disease resistance of T. chebula is strong, but under artificial breeding conditions, due to high stocking density and poor management and other reasons. Some common fish diseases also occur occasionally (such as water mold disease, trichoderma disease, gill rot, enteritis, dusting disease, etc.). Therefore, in the process of fry breeding and adult fish breeding, the eyelids should not be taken lightly, and they still insist on The principle of "prevention-oriented, prevention-responsive" will effectively implement the following measures in preventing disease: 1 Thoroughly clear the pond; 2 Fish species should be sterilized and sterilized; 3 Do not use unfermented manure; 4 Feed fresh, high-quality feed; 5 regularly change water, increase the amount of water injection in the high temperature period; 6 every half-month splash lime disinfectant body: 7 if there is death, injury, diseased fish and residual bait to remove in a timely manner; 8 find fish disease symptomatic medication . More commonly used and safe drugs are: quicklime, bleach, trichlorfon, oxytetracycline, chlorpyrifos, povidone iodine, etc., given that red pecker is very sensitive to copper sulphate, it is recommended that the main lagoon be banned from copper sulphate.
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