In the winter, how to make young juveniles in the earth ponds safe for the winter and continue to grow is the most concerned issue for the majority of practitioners. After many years of experiments, the Dongguan Fisheries Research Institute and Guangdong Green Card Industrial Co., Ltd. have successfully explored a set of “low-cost, easy-to-operate, and good-effective membranes that increase the temperature and raise the temperature.†The techniques of the technology are as follows: 1. The construction of an arched earthen shed and a warm shed can use wooden stumps and wood slats to construct a simple scaffolding in the juvenile earthworm pond. High around low. The top and the surrounding are covered with a wide nylon film. In the opposite southeast and northwest direction, there are two movable doors for operation and ventilation. Make the entire film to achieve a good insulation performance, easy operation, favorable drainage requirements. Second, do a good job in cleaning and disinfection of the bottom of the pond Third, adjust the breeding water body temperature shed before the use of aquaculture water adjustment. The water level of fish ponds is slightly lower than the summer water level by one third. If it is new water, quicklime can be given 0.15-0.25 kg/sq. m., teacup 0.04-0.075 kg/sq.m., after 3 days, appropriate application of green manure or N. P Inorganic Fertilizer, which is cultured in water to make green and diatoms such as Chlamydomonas, Chlorella, and Cyclotella sp. form dominant populations. The water is oily green or brownish (commonly known as oil water) and the total biomass is 20-50. Mg/L, transparency 25-30 cm can be. The surface of the pond is put in some water lotuses in order to create a good ecological environment, and to remove some harmful substances such as ammonia nitrogen. Fourth, the stocking density of the Pearl River Delta region experience, if it is individual weighs 4.8 grams of juvenile fish, the general stocking density of 20-25 / square meter. In this way, the water temperature can be maintained at 283°C. After 183 days of feeding, it can grow to a weight range of 48.1-201.3 g. If the pups only weighed 129.8 grams, the average daily weight gain was 0.68 grams, and the average daily growth rate was 1.8%. The stocking density can be appropriately increased or decreased according to the average weight of the stocking, and the stocking density can be slightly more, and the stocking size can be slightly less. But do not be too dense, so as to avoid deterioration of the water quality, harmful carcass. Practice has shown that, as with fish, there is a problem of optimal aquaculture capacity, utilization rate of fish load, and utilization efficiency. Fifth, pay attention to adjust the pool water temperature, regardless of size, if the temperature below 15 °C have the physiological characteristics of hibernation. The main purpose of the implementation of the increase of the earthen shed film and warming culture is to ensure that the temperature of the water in the pelicans is guaranteed to be above 20°C by increasing the temperature of the larvae, so that the young cubs are exempted from hibernation. During this time, feed it and let it continue to grow. The experiment also proved that juvenile cubs do not harm because of hibernation. There is no sequelae, and after eating, the body weight continues to increase. Therefore, the key to this set of measures is to try to adjust the pool water temperature. The main methods are: 1 Give full play to the role of ventilation door. The rule is: coalescence of solar heat, raising the water temperature with temperature. According to the needs of water temperature regulation. Multi-ventilation at high temperatures, low ventilation or no ventilation at low temperatures. Moderate ventilation during the day and no ventilation at night. 2 When the weather continues to be cold, when the pool water temperature drops to a critical temperature of 15°C, boilers can be used to heat hot water and pour into the ponds (but there must be a section of hot and cold water to regulate the buffer zones, and it is not appropriate to directly pour hot water into the pond) to raise the pool water. Temperature, keep the water temperature above 20 °C. Sixth, the main rickets and integrated prevention and treatment of shed film increase, warming earthworm breeding of juvenile diseases white leukoplakia, hemorrhagic septicemia and white floor disease 3 kinds. The comprehensive prevention and control methods of the above three main diseases are: Maintaining a good water environment, ecologically raising water, and raising water first. In order to increase the water quality of the shed film and warm the earth pool for a long period of time, the key is to control the water color and transparency of the pool water. During the aquaculture process, beneficial microecological preparations should be regularly applied to regulate and improve water quality; quicklime should be properly applied to raise the pH of the water body; copper sulphate or chelated copper should be cast to kill excessive amounts of harmful alfalfa, diatom algae, microcystis, etc. Cryptophyta and Euglenophyta; crystal trichlorfon should be applied to kill over-propagated Cladocera and copepods, then green manure etc. should be applied to promote the growth of beneficial green algae; water should be regularly added and replaced in the rearing pond. A small amount of cockroaches, cockroaches, and cockroaches will be mixed, and floating plants will be planted on the surface of the greenhouse for a long period of time—big drift, restoring the water color and transparency to a normal and good state. Each pond shall be equipped with a 2.5 kW air compression pump outside the shed. The fresh air outside the shed shall be directly pumped into the pool water in the shed to increase the dissolved oxygen in the pool and promote good water quality. The use of full-price, nutrient-balanced compound feeds to enhance drug management and prevent disease from occurring has shown that many drugs, in addition to formaldehyde, exhibit extremely insensitive phenomena, and their safe concentrations are much higher than those of common fish. It provides a theoretical basis for large doses of medication. A large number of experimental studies have shown that veterinary tablets such as Langen, Coptis chinensis, Radix Salviae Miltiorrhizae, Liver and Inosine have significant preventive effects against earthworms. Tablets are mainly used to regulate the dosage. Oral dosage is 1.5-2 times that of mammals on a regular basis. The above 5 tablets are used for 5-7 days as a prevention period. Every 30-45 days can effectively prevent bacterial hemorrhagic sepsis and viral hemorrhagic white floor syndrome. When sporadic lesions occur, symptomatic treatment must be actively and promptly performed.
Red Star apple variety originated in the United States and was introduced to Qingdao in 1982. It is mainly distributed in Jiaonan, Laixi, Pingdu, and Jimo. It is one of the main apple varieties grown in Qingdao. The average weight of a single Red Star apple is 190 grams, with some reaching up to 500 grams, and the fruit shape index is around 1, with a conical shape. The fruit surface is smooth, with thick wax, abundant bloom, deep and wide calyx cavity, and prominent five ridges. When the fruit first turns red, there are distinct intermittent red stripes, followed by a red blush, and when fully colored, the whole fruit is deep red with prominent purple-red coarse stripes, a glossy surface, and light brown or gray-white fruit dots. The flesh is pale yellow, crisp, juicy, and sweet.
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