Goldfish have a long history of breeding in China and have a long history. Family-cultivated goldfish are generally divided into three categories: pond culture, garden culture, and aquarium culture. First, the choice of goldfish 1. Choose a fish that is robust in shape and bright in color. To choose any kind of goldfish, you must choose the fish body to be strong, with complete chest, abdomen and tail fins, and a large open tail. Fish without a dorsal fin, the back of the spine should be smooth, no missing dorsal fins or nodules. The color of the fish should be selected from the red, the white, the blue, the blue, the dark, the black, and the flower should be harmonized. The pattern is meticulous, and must be blue. Some fish are semi-red, semi-black, or red and black. They are very beautiful at the moment. In fact, they will soon become full-red. 2. Choose healthy and disease-free fish. In general, the swimming pools (pots) should be selected for active swimming, gregariousness, and abundance of body shape. The chest and pelvic fins should be open and often stroked. There should be no white spots on the body, no white villus-like mucus, and no bloodshot, ulcerated tail and scales. Float on the water, do not lie on the side, invert, or sink. The stool is black and thick. Buy fish that is being eaten. Those who meet the above conditions can buy it boldly. 3. Select fish with obvious characteristics. All kinds of fishes have the characteristics of this species, such as selected heads, lion heads, red cranes, red goose heads, etc., all of which are known for their sarcomas on their heads. Therefore, we have to choose head caps. The sarcoma is the most developed and spacious. In addition, fish with red sarcoma, such as Heding red and Goose head red, are top-quality red-top square fish (head color is darker). Select pearl scale fish should pay attention to two kinds of large and small tail, big tail is better. However, regardless of the big tail or small tail, must choose the small head, beads scales are thick, arranged neatly until the spine, but the scales can not be erected (otherwise most of the scale disease), abdominal thickening circle, tail smooth, this feature only It is a pure breed. The blisters or dragon's eyes are all named after the features of the eye. Therefore, the blisters should be large and well-proportioned, and the blisters should be soft and transparent. When selecting the dragon's eye, you must choose a large eyeball that stands out like a chess piece. Second, the requirements of aquaculture water quality It is an indisputable experience that fish farming can raise water first. How to "cultivate" a clear, non-toxic water in a home is crucial. Family fish farming is different from fish farms. The water space is small and requires clear and transparent water, which is convenient for watching goldfish. Fishery fishery is to make the goldfish grow quickly. Professional fishermen watch the water quality from time to time, the water body is large, and it is suitable for goldfish to grow up. Family goldfish have their own advantages, such as water temperature, because the family fish is generally indoors, so it is not affected by wind and rain. There is also a small amount of fish in the family, which facilitates water quality observation and drug control. Domestic goldfish water conservation is mainly related to the following five factors: filtration system, biodegradation, fish density, feed selection, and fish culture environment. By paying attention to the above points, you will surely have a clear water tank and create an ideal living space for your beloved fish. Third, the reproduction of goldfish First, the discrimination between male and female. During reproduction, the female body is larger in size, and the posterior abdomen is enlarged and active. There are several small white protrusions on the first rays of the pectoral fins of the male pectoral gill. These small protrusions are named "chasing stars" and "chasing stars" as males. The second characteristic of fish is that after the breeding period, the starchaser disappears from the male fish, while the female does not have this feature. Male pectoral fin shape slightly longer, female pectoral fin shape slightly rounded; male tail slightly thicker, female tail tail slightly more. You can also hold the goldfish in your hand so that the abdomen faces downwards. Start with the index finger from the point of the anal fin and press lightly along the ventral edge of the abdomen. The hard-feeling fish is male and the soft one is female. In addition, the excretion of the male fish was small and slender, with a jujube-like shape, with sharp ends at both ends, slightly dilated in the middle, and slightly inward or flat on the body surface, while the excreted reproductive pores of the female fish were pear-shaped and microscopic. Outburst, pear handle one in front, and pear handle opposite party. According to the combination of the above methods, it is not difficult to discriminate between male and female. 2, artificial breeding method. There are two kinds of water insemination and water insemination. The in-water insemination method is when the male fish begins to chase the female fish fiercely, and when a few eggs of the female fish are discharged, they should be removed and put into a new container containing 1/3-1/2 of water and then both hands. The male and female brooders of the appropriate age are selected so that their reproductive pores are opposite, and then the abdomen of the male fish is gently pressed with the thumb. After the outflow of milky white semen, the eggs of the female fish are squeezed out in the same manner, so that the semen and the eggs are both The rapid insemination of water into the body, this time, the egg from transparent to beige fertilized eggs. Water insemination is characterized by insemination without leaving water. The damage to the broodstock is smaller than that of the water insemination method. The insemination egg has strong viscosity, can quickly attach to the artificial fish nest, change the water easily, operate conveniently, and have high insemination rate. The water insemination method should firstly select excellent broodstock with obvious chase phenomenon, then remove the male fish, gently squeeze the abdomen of the male fish, suck the ejaculated liquid with a straw, place it in a dry container, and quickly squeeze the female fish. In the abdomen, after the egg is injected into the container filled with semen along the abdomen, mix it with clean feathers and mix it evenly so that the semen is mixed evenly with the egg granules. Injecting a proper amount of water will allow the eggs to be fertilized rapidly and wait a few minutes. The replacement of raw water, most eggs become fertilized eggs. The temperature of the water for reproduction is preferably 19-21°C. In the lOOhr grain, larvae that swing at the tail will appear. 3, larvae grow. Around 7d to 10d, larvae have escaped the ability of human capture. Aquaculture water should be clean, water should not be deep, density should be controlled, and feed should be supplied on time and in good quality, with egg yolk water as appropriate. When the lem is reached, small blisters can be fed and the water quality needs to be cleaned. It is advisable to change the water with a minimum temperature difference. When it reaches 2era, it can feed red worms or leeches. When it grows to 4-6cm, it can feed pellet feed. Fourth, goldfish feed Goldfish are omnivorous fish and have a wide range of foods, which brings great convenience to the breeding of goldfish. However, in order to achieve a good feeding effect, we must carefully understand the characteristics of goldfish and the characteristics of various feeds, so that the goldfish raised by the color is bright and healthy. Good goldfish feed ingredients should include: protein, fiber, fat, various vitamins and trace elements. Goldfish feed can be divided into two categories: aquatic biofeeds and synthetic feeds. Aquatic organism feeds include living or dried aquatic animals that can be ingested by goldfish, including: leeches, sword leeches, blood bugs, leeches, duckweed, and others. Synthetic feed can be divided into four types according to different forms: pellet feed, powder feed, sheet feed, patch feed. V. Prevention and treatment of fish diseases Goldfish disease is caused by the following factors: environmental factors, physical injuries, and viral infections. l. Environmental factors. Goldfish live in water and is sensitive to changes in light, water quality, and water temperature. Especially the change of water temperature, the sudden change of the extreme water temperature that the goldfish can bear is 4cC, beyond this limit will inevitably be sick, even cause death. Therefore, when changing the water and changing the cylinder for goldfish, pay attention to the change of the old and new water temperature. In addition, the sudden changes in water hardness and pH can also affect the biological protection film of goldfish and cause goldfish to become ill. The correct approach is: before changing the water, the new water should be air-dried for 3 days so that the water temperature will be within 1°C of the old water, and the chlorine in the water will be volatilized. Change the water volume below 1/2, and slowly inject new water. In the event of an emergency, water stabilizers can be added to new water to quickly remove harmful substances from the water. Add boiled water and use a thermometer to measure the temperature of the water before it reaches the old water. 2, physical damage. In the process of moving goldfish, it is easy to cause damage to the surface of the goldfish, which can cause severe rupture of the internal organs of the goldfish and cause death. In addition, in the aquarium if there are sharp ornaments, such as coral stones, plastic grass, etc., there will be blister piercing, bead scales off the situation. Even the risk of physical damage can be caused by excessive pump suction or rapid flow of water. Therefore, when moving a goldfish, it is recommended to use water otters to fish. The action should be light and fast, otherwise it will be damaged due to the struggle of goldfish. In addition, when transporting goldfish, it is necessary to use the best transportation routes and means of transportation to minimize the delivery time and reduce bumps. Aquarium equipment and accessories to the surface smooth or soft material. The inlet of the pump can be equipped with biochemical filter. The water inlet of the filter is equipped with an elbow to reduce the impact of water flow. 3, infection. Goldfish live in water. Because water has limited space and water is static, it can easily breed bacteria. Goldfish purchased from different places may also bring viruses. In addition, corrupt food can also cause enteritis in goldfish. Diseases caused by bacterial infections should be observed, treated, and isolated as soon as possible, and patient fish must be decisively eliminated. Single Packed Mottled Waxy Corn Waxy corn comes in a variety of colours. Some people wonder if waxy corn is a genetically modified product. In fact, it is not. Waxy corn originated in China. It is caused by a genetic mutation. Artificial selection gradually led to the emergence of a type of tannin.
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Waxy corn, also known as waxy corn, is sticky corn. The grain has coarse, waxy endosperm, similar to shiny, glassy (clear) grains such as hard and dented corn. Its chemical and physical characteristics are controlled by a recessive gene (wx), which is located on chromosome 9. 100% of the starch in the endosperm is straight-chain starch.
Coloured glutinous corn is generally white, yellow, red, purple and black, with white, yellow and purple corn being the basic colours. Purple and white hybrids naturally become purple if the purple gene "beats" the white gene and vice versa, so if the two tie we see white and purple corn. Purple can turn into red and black corn, or as we often say, "red is purple and black is purple". Of these colourful corn, the most common yellow waxy corn is the most nutritious as it is rich in carotenoids...
Currently, the only genetically modified foods sold on the Chinese market are soybean oil and papaya. Waxy maize is a hybrid variety and is not associated with genetic modification. Therefore, it can be concluded that glutinous maize is a hybrid variety and has nothing to do with genetic modification.
Genetic modification is a type of "genetic engineering" in modern science and technology, which makes use of modern molecular biology techniques. Hybridisation is the mating of individuals of different genotypes to produce offspring that are different from the original "pure" breed. In a sense, it belongs to the natural exchange of genes that can occur in nature.
