Triangulation breeding research

The Megalobrama terminalis, commonly known as the tower pelican, Triangular marabou, Ukrainian pagoda, and scientific name flat chest. Is a bony fish skeleton, under the order of 鲤-shaped, 鲤, 鲂鳊 subfamily, 鲂 genus. It is a rare breed of artificial fish farming in China. At present, the market price of carp is stable, and some places have been kept at 24 yuan/kg or more. The breeding efficiency is very considerable and the breeding prospects are very broad. 1 Breeding prospects The triterpenoid grows fast and has large individuals. It can grow to 80-150 g in the natural waters where the reservoir does not feed, and the second-instar fish can grow to 300-600 g, with an average of 400 g. It grows to 800 g and can reach a maximum of 5 kg. In the large water surface such as reservoirs, it has the advantages of self-breeding, population productivity, and relatively easy fishing. It is currently an important species in China that promotes the promotion of large water surface culture. Many large and medium-sized reservoirs have the conditions for transplanting trigeminal ridges. The transplantation of triangular radon will not only cause no pollution of water quality, but it also can be used as a water quality monitoring fish because of its higher water quality requirements. Large- and medium-sized reservoirs have the characteristics of small investment and large profits because they can form natural populations in the reservoir area, so they can be used for long-term benefits. In addition, triangular trout is also a good breed for cage culture and pond culture. 2 Biological characteristics 2.1 Morphological characteristics Trigonella falcipa is a kind of wild large-scale economic fish. It is diamond-shaped. It has small head, small oblique mouth, end-mouth, and large curvature of upper jaw and lower jaw. , slightly "△" shape, showing a green-brown, dorsal fins of the third non-branched fins are smooth hard thorns. The abdomen is silvery white, with ventral ribs from the pelvic floor to the anus. The body's side is grayish black, with a deeper back part of each scale, and each fin is grayish and slightly dark. The tail shank length is greater than or equal to the tail shank height. 2.2 Habitat habits Triangular invertebrates live in flowing or still waters and inhabit in the middle and lower layers of water. They prefer muddy waters and drowning areas with submerged plants. Fresh water quality and high dissolved oxygen are required. In winter, the fish group prefers to concentrate wintering in deep water. 2.3 Edible Triterpenoids are omnivorous fish, mainly for aquatic plants, but also eat aquatic insects, small fish, shrimp and mollusks, especially like to eat freshwater shell dishes. Juveniles feed on horny crustaceans, crustaceans, and aquatic plants such as the main food, Vallisneria, and Hydrilla verticillata. At the same time, eat freshwater shellfish and other mollusks and aquatic insects. 2.4 Distribution Triangulations are distributed in the waters of Heilongjiang, Songhua River, Wusuli River, Nenjiang, Xingkai Lake and Jingpo Lake, and are also distributed in Guangdong and other places. However, it is rarely caught. 2.5 The reproductive age of the Trichomela falciparum is 3 years and the reproductive period is 5-6 months. Spawning period is from June to July, the eggs are light yellow, sticky, and slow flow is required during spawning. The 4th instar fish with an average weight of 2 kg has an absolute fecundity of 2 to 4 million. The female weighing 3.5 kg had 308 220 eggs. It grows faster before sexual maturity and slower later. 3 Trichomes breeding techniques 3.1 The selection of cages for the site is preferred to choose deep reservoirs and bays near villages and houses, with sunny leewards, or farmland in the bottom of the reservoir or flat open land. The upper reaches and surrounding water resources of chemical fertilizer plants, pesticide plants, paper mills and other pollution sources should not be selected. Reservoir breeding is better with freshwater shellfish or mollusks, aquatic grasses, reservoirs with good water quality, or less water pollution and adequate water sources. 3.2 Fry cultivation Hatched larvae must undergo post-embryonic development for 3 to 5 days in order to be cultured in the lower pool (preferably with egg yolks). Disinfect the ponds and fertilize the water before lowering the pool. First test the water with the triangle fish “fish flower”, observe the disappearance of pool water toxicity, and then put the fry. The water quality is refreshing, the transparency is above 40 cm, and it is better to use thinner water. The "fish flower" stocking density is about 100,000 per acre. After the lower pool, feed 2 to 3 times a day soaked peanut bran and other fine bait 1.5 kg / acre, and then gradually increase with the fish grow, while the amount of organic fertilizer spilled to cultivate natural food. After 30 to 40 days of pond cultivation, the fry can grow to 5-6 cm in diameter and can be used for the first time to pull nets and sparsely, with a density of 20,000 to 30,000 tails per mu. Continue to cultivate 30 ~ 45 d fry up to 8 cm, at this time for the second time sparse, the density of 10,000 / acre. It is cultivated until the third year of spring, and the total length of the fry can reach 10-15 cm. After the first net exercise, the fish were trained once every 20 days and the growth of the fry was observed. During this period, as the fry grows, the amount of feed increases and the water quality becomes fatter. Therefore, depending on the condition of the water quality and the status of the fish fry, change or inject fresh water regularly or from time to time to keep the water fresh. The feeding of the feed is the same as the cultivation of the fry. 3.3 Stocking Density Trigonella falcata can be cultivated individually or in mixed culture. The single trophic is best divided into three levels of rotation. The first level (5 ~ 12 cm) is 1 to 20,000 per mu and the second level (12 cm to 1 kg). 2000 to 3000 tails per mu, and the third level (above 0.50 to 1.25 kg) is 800 to 1000 tails per mu. The single carp pond is suitable for 30 pairs of carp and 60 per carp. Polyculture trigeminal pond, put 50 to 100 per acre seedlings. 3.4 Feeding and Managing Seedling Soybeans are soaked in ground soybean milk and fed 2 to 3 times a day. Every 666 m2 needs 3 to 4 kg of soybeans every day. With the growth of the fish, the amount of feed is adjusted. In addition, according to the condition of water and fat, timely application of human and animal manure compost, generally the amount of fertilizer for each 666m2 pond is 40 ~ 50 kg. In the breeding process, all the special granular materials can be used, and peanut skin, wheat skin and green feed can also be fed. The pellets are mainly made of fish meal, vegetable cake, bran, etc., and are made into small-sized fish pellets (particle size 1.0 to 1.5 mm) and adult fish pellets (particle size 2.5 to 3.5 mm) in a small hard pellet feed machine. The content of animal protein in pellets can reach about 26%. Feeding small fish feed at the beginning of the breeding, the daily feeding amount is 5% to 7% of the fish's body weight; the adult fish feeds are fed in the middle and later stages of the breeding, and the daily feeding amount is 3% to 5% of the fish's body weight. Feed 3 times. In actual operation, it should also be flexibly adjusted according to the weather, water temperature, and food intake. It is generally appropriate to eat it in about 2 hours. 4 Day-to-day management 4.1 Food farm management To feed pelleted feed, a food counter must be set up. The forage is accompanied by investment, and at the same time, it is regularly sterilized on the food and food counters. Check and clean the food counter every morning. At the same time, according to the previous day's leftovers, the amount of feed for the day was determined. 4.2 Water Quality Adjustment The triangle bowl enjoys refreshing water quality with a transparency of about 30 cm. Inject new water once a week. Sprinkle once a day with quick lime. Use and use the same amount as home fish. 4.3 Ponds and cages Management Ponds: Inspect the ponds sooner or later, remove the frog eggs in time, trap the mud snakes, and add fresh water at a proper time to prevent the floating head of the fry. Cage: Wash the cage every 7-10 days. In addition, check whether the cage is broken or slippery every day to prevent fish escape. 4.4 Precautions 1) Observe the feeding and growth of the fish and carefully avoid the escape. 2) Elimination of predators, such as water mice and wild ducks. 3) Wash the cage to ensure the smooth exchange of water. 4) Care should be taken in the operation of the seedlings' turning boxes or adult fishes to prevent infection. 5 Disease prevention cages should be sprayed with 25 to 30 ppm of quicklime or 1 ppm of chlorine dioxide every other half of the cage every two weeks. Sprinkle once a day for 2 to 3 days. In addition, use a small woven bag, each bag containing 100 ~ 150 g of bleach or copper sulfate (alternate use), hanging above the feed table, each box hanging 1 bag, add after the drug. In case of erythrodermic disease, each diseased cage can be sprayed with 4 ~ 5 g of chlorine dioxide, once a day, for 3 consecutive days, and add ciprofloxacin 1.0 ~ 1.5 g per kg of feed. 3 d. In the event of saprophytic disease, the diseased fish can be soaked in 0.4-hour baking soda and salt solution for 20-30 minutes. In case of rot disease, each diseased cage can be treated with 800-1000 g quicklime and sprinkled with water once a day for 3 consecutive days, and add “Fara Neas” 5 g per kilogram of feed and continue feeding for 3 days. For aquatic predators such as otters and mud snakes, they may be based on species. Mink can be sprayed with 666 powder 2 mg/kg plus diesel or kerosene 0.3 mg/kg with appropriate amount of fine sand and stirring. The mud snake can use type B fish to exterminate 0.7 mg/kg with water and spray it on the whole pond. The use of this medicine must be 2 cm after the size of the fry.

Disposable Laparoscopic Trocar

Disposable laparoscopic trocars are typically made of plastic or metal and are designed for single-use only. They are available in a range of sizes and shapes to accommodate different patient needs and surgical procedures. The trocar is typically inserted into the patient's abdomen using a technique called "blind insertion," which involves inserting the trocar through the skin without direct visualization of the underlying tissue.

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