1. CYPRINIDAE are mainly various lampfishes, such as traffic lights, triangle lampfishes, lotus lampfishes and Congo flags. Generally speaking, the water temperature suitable for lamprey family is between 22 and 28 degrees Celsius. Lampetraceae likes slightly acidic soft water with a PH value of about 6-7, which can be cultivated with ordinary tap water. The lamprey fishes are mild in temperament and can be mixed with peacocks, bettas and colorful fishes. 1, traffic light: the adult fish at the traffic light is 4 cm long. The whole body is covered with turquoise luster, with a bright turquoise belt from beginning to end, and a red belt below the turquoise belt in the back half. The abdomen is blue and white, and red and blue stripes run through the whole body, dazzling. In different light or different environment, the color of ribbon is sometimes dark and sometimes light. 2. Lotus lantern fish: 4~5 cm long. The body color is gorgeous, and there are two parallel ribbons from the rear edge of the eye to the side of the tail handle. The upper one is a wider blue-green ribbon, and the lower one is a wider red ribbon, which is harmonious and dazzling. Observing from different angles under the illumination of light, it changes from blue to green; The ventral surface from pectoral fin to the base of caudal stalk is completely bright red. 3. Fenugreek: The fish body is spindle-shaped, slightly flat on the side, and the caudal fin is forked, with a body length of 5 cm. Its dorsal fin, anal fin and caudal fin are all red and white. The pectoral fin and ventral fin are colorless and transparent, and there is a black triangle pattern in the middle of the body from the ventral fin to the base of the caudal fin, so it is also called blue triangle or black triangle fish. 4. Flag raising in Congo: The fish is 8- 10 cm long, spindle-shaped, with small head, big eyes and upward crack. The dorsal fin is tall and narrow. The ventral fin and the anal fin are bigger. The outer edge of the caudal fin is straight, but the center of the outer edge protrudes. The body color cyan is mixed with golden yellow, and the large scales have metallic luster. In the light, they are colorful and very beautiful. Second, Anthuridae is an oviparous fish represented by guppies. Common species are guppies, swordfish, Mary and so on. 1. Peacock fish: Also known as anchovies, it is named after a few small blue spots or stripes on its abdomen, which is as elegant as a peacock. It is the first choice for novice breeding. Peacock fish is gentle and lively, likes to swim in the middle and upper layers of water for food, and has low requirements on water quality and water temperature. Tail fins have different shapes. The male fish is colorful, changeable, brown-green, red, blue, purple and yellow, especially like a rainbow. The body color of female fish is much worse than that of male fish, and most of them are single silver gray. Although there are some patterns on the tail fin, it is not as bright as the male fish. The female fish has shorter fins than the male fish, but its body length is about twice that of the male fish. 2. xiphophorus: xiphophorus is 12 cm long and looks like a spindle. The male fish is slender and brightly colored, and the lower edge of the tail fin protrudes from the needle fin, commonly known as the sword tail. The female fish is fatter, slightly lighter in color than the male fish, and has no sword tail. Swordtail fish is an indispensable species in aquarium. Through artificial breeding, its body color is more abundant. Swordtail fish is omnivorous, big eater, strong and easy to raise. It can adapt to weak acidic water or weak alkaline water, and the suitable water temperature for feeding is 24-26 degrees Celsius. 3. Black Mary: Black as ink. The male fish is smaller, the back half is flat, the swimming speed is fast, and the anal fin evolves into a rod connector; Black Mary is a kind of egg-laying fish that is difficult to raise. Aquariums without sunlight are difficult to maintain and are very sensitive to changes in water temperature. It doesn't like to change all the water at once, but always change the water locally. Black Mary is an omnivorous fish. It feeds mainly live bait such as larvae, and can also feed some fresh spinach. It likes to eat aquatic plants and moss on the pond wall. 4. Kimberly: wide spindle shape, flat side and fan-shaped caudal fin. The fish is golden yellow, and the whole body is covered with golden red spots. From the back end of gill cover, the fish body has ten vertical stripes composed of golden red dots, which extend to the base of tail stalk. The dorsal fin is very wide, which is almost the height of a fish when unfolded. With a body length of 100 mm, Golden Mary is easy to raise, does not require high water quality, likes weak alkaline hard water, the water temperature is suitable for 20-24 degrees Celsius, and has a gentle temperament. It never attacks other fish, so it is a good variety of polyculture. Perch fishes are carnivorous, and some species will be found in eat small fish. Suitable for weak acidic soft water, with PH value of 5 .5-6.5 and water temperature of 20-30 degrees Celsius. Common species are: fighting fish in Thailand, kissing fish, etc. 1, fighting fish in Thailand: 50 ~ 80 mm long, flat side; The head and back are shallow and curved, and the back and abdomen are straight. The dorsal fin is located on the back, and the fin strip is longer; The ventral fin is located below the pectoral fin; The base of the gluteal fin is very long, the fin is developed, the front fin is short, and it gradually extends backwards. Thai betta fish, which has been farmed artificially for a long time, has formed many breeds with colorful body colors. 2, kiss fish: oval body, flat side. The body color is silvery white, slightly pink, and the snout is reddish. Mild temperament, can be mixed with other kinds of fish. The action of the snout fish is very strange, and it often kisses its companion with its serrated mouth. This is not love, but a competition. Algae in the tank wall are often eaten by people with their mouths. 4. Cicadellidae: Usually the immortals, colorful birds and parrots we see in the ornamental fish market belong to Cicadellidae. The species and appearance of cichlids have many characteristics, even in the same family, there are great differences. 1, angelfish: also known as swallow fish. The body is diamond-shaped, the polar side is flat, the trailing edge of the caudal fin is straight, and the dorsal fin and gluteal fin extend backward, symmetrical up and down, like an open sail. The ventral fin is long and filiform. From the side, it looks like a swallow flying in the air, so it is also called swallow fish. Angel fish have no gorgeous colors. The original fish is silvery white with a golden back. It has four black stripes on its side. The first one passes through the eye socket, the second one is at the front edge of dorsal fin and the base of gluteal fin, the third one is from the end of dorsal fin to the end of gluteal fin, and the fourth one is at the base of coccyx. Its dorsal fin and anal fin are light yellow, its caudal fin is transparent and covered with black longitudinal stripes, and its eyes are red. Adult fish can reach 150 mm in length and 200 mm in height. Angel fish like to live in weak acidic soft water with pH6.5-7.0, and the suitable temperature is 26-30 degrees Celsius. Angel fish like fresh water that has been dried, and changing water frequently will reduce their chances of getting sick. Angel fish are not picky eaters, but like to eat fresh bait such as earthworms. Generally, it is enough to feed them twice a day. Classification of angelfish: angelfish is an early tropical fish. Today, after long-term hybridization and domestication, angelfish itself has also undergone many changes. People divide angelfish into finer species according to the length of tail fin, the stripes of fish body, the different colors and the size of their bodies. As far as each species is concerned, the stronger the acquired characteristics, the better the quality. For example: diamond fairy fish: red eyes as bright as gems, medium and long tails as streamers floating with the waves, preferably white without noise; The ventral fin and the gluteal fin are slightly shorter and flat backwards, like paddles. The whole body shines like a diamond, and under the light, every scale is like a crystal diamond, reflecting light; Glass fairy: Red-headed red eye has the advantages of white angelfish, the difference is that it is completely transparent, and it is the top grade that can see fish bones and internal organs; Black Fairy (Mo Yan 'er): medium and long tail, wide fin, butterfly shape, black body without variegated color, transparent box-shaped tail fin base, big fish is the best of these fish; Marble Fairy: Big, medium and long tail, with scales shining like marble, and red eye or red eye circle is the high-end product of this kind of fairy. This knowledge can be used as a reference when you buy angelfish. The more top-class angelfish, the harder it is to raise. The varieties that are easy to raise are: black and white fairy, panda fairy, marble fairy, glass fairy, diamond fairy and so on. 2. Seven-color fish: called "seven colors", this kind of fish is a popular medium-sized fish in the market. The adult fish is about 20 cm long, nearly round, with flat side, extremely short tail stalk and symmetrical dorsal fin and anal fin, starting from the base of dorsal fin and ventral fin respectively. Even the tail handle and fin extend backward and attach to the tail fin, and the outer edge of the tail fin is shallow and arc-shaped. Body colors are red, yellow, white, purple, etc. In terms of patterns, there are mainly differences between leopard patterns, snake patterns and beads. These patterns are irregular, curved or wavy from dorsal fin, head, body to gluteal fin. Seven-color fish is a kind of high-temperature and high-oxygen fish, which has strict requirements on water quality and bait and is very difficult to raise. Not only should the water be clean, oxygen-rich and suitable for illumination, but the water temperature should be kept at 26~30℃ all the year round. Colorful's favorite water is weak acid soft water, with pH below 6.5. In addition, the ion content in water should not be too high, so we need professional water quality monitoring instruments to detect these two indicators. If the water quality and temperature change suddenly or the conditions are slightly worse, the colorful fish are likely to have diseases such as rotten fins and long white spots. Generally speaking, Qicai is an omnivorous fish, and the bait is mainly frozen worms. Now I often feed frozen red worms, bumper shrimp and beef heart hamburgers. When feeding, take a proper amount of bait and put it directly into the fish tank. The feeding amount is about 10 minute. 3. Nautilus: The adult fish is 10- 12cm long, oval, and looks like a goldfish. The head is bright red, there is a small sarcoma on the top of the head, pink or blood-red, plump, full of ruby luster, chubby and very attractive. Because it is a cross between different varieties, the male blood parrot is infertile. Because it is produced by hybridization, there are many varieties of parrots themselves: 1, and blood parrots: red in color, wide in body and short in tail handle. The face is like a parrot: big eyes, small mouth, the maximum length is 20 cm, the young fish is gray, and the adult fish is bloated, pink or blood red. 2. Macaw: A variant of the blood parrot, with a big red sarcoma on its head, a body length of more than 30 cm and a life span of about 8 years. 3. A heart parrot: Cut off the tail of the blood parrot by surgery to see the shape of the heart when the elephant stands upside down. When buying parrots, pay special attention to their mouths and gills. The perfect parrot should have a small triangular, T-shaped or heart-shaped mouth; At the same time, the gill cover part cannot be everted. The bigger the eyes, the better, and the shorter the body. Parrotfish can interbreed with other species. The inlet water temperature is 22~28℃, which requires weak acidic soft water and likes clear water quality. Love to eat small jobs, but also eat synthetic feed. Such as artificial bait, red worm, bumper shrimp, water lice, etc. Attachment: At present, there are 1 large ornamental fish on the market, arowana: arowana, a very old fish, and the common arowana in the market mainly includes arowana, arowana and arowana. Jinlong can be further divided into red tail gold and back gold. Red dragons are also divided into Chili red, blood red and orange red. Arowana usually has a long body, a flat side, a fan-shaped tail, a strip-shaped dorsal fin and buttocks, and extends backward to the base of the tail stalk. The lower jaw is more prominent than the upper jaw and has a pair of short and thick beards. Its wide fish body is neatly arranged with five rows of large scales, shining silver in the light. Each fin reflects a bright red or orange luster under the light. Red dragon, eye-catching red is a symbol of good luck in the eyes of ordinary people, which is also the reason why red dragon is popular. The scales of Jinlong are golden, and all the fins are golden red. The body color of the red dragon is golden yellow, the scales are golden red, there are dark red spots on the mouth and gill cover, and all the fins are dark red. The silver dragon is silvery white. The body color of the black dragon is silvery white, slightly blue-purple, and the grain is all basket black: the body length of the arowana can reach 50~90 cm. The charm and beauty of back-crossing gold lies in the brightness of its scales. Mature gold is covered with golden scales. The body length of red-tailed arowana can reach 55 cm, and the upper part of the fish body, including the upper part of the fin, is dark and dull. The scales in other parts are golden yellow, and the lower part of the tail fin is bright red. The survival of arowana needs weak acid to neutral water quality, and the hardness needs soft water. The PH value is between 6.5 and 7.5, and the DH value is 3- 12. The water temperature is 24-28 degrees Celsius. The baits that can be fed are: small fish, shrimp and insects. 2. Map fish: Map fish is a large tropical fish with a total length of 30cm. Big body, flat side, rectangle, big head and big mouth. The base of dorsal fin is very long, from the upper back of pectoral fin to the base of caudal fin. The front of the fin is a serrated short hard spine, and the soft fin at the back is long and symmetrical with the gluteal fin. The ventral fin is in the chest position, and the knot end is pointed. The trailing edge of the caudal fin is round. The side of the body is dotted with irregular gold dots with red stripes, which looks like a map. There is a red ring with a gold edge at the base of the tail fin, which shines like a star on a summer night, so it is also called tail star fish. Map fish can be divided into white picture, flower picture, red board picture and even board picture according to different body colors. Map fish consumes a lot of oxygen, so it is appropriate to put it in a diluted state in an aquarium. Map fish likes to eat live animal food. It is a fierce carnivorous fish and should not be mixed with small fish. The suitable water temperature for map fish is 22-28℃, and the optimum water temperature is 24-26℃. When the water temperature is lower than 18℃, the map fish will die, and when it is higher than 30℃, it will not live well or even die. Although the requirements of map fish on water quality are not very strict, the water quality is fresh and can greatly promote the growth of fish. 3. Arhat fish: Arhat fish, also known as Arhat, belongs to the Cicadellidae family. Adult fish are huge in size, rich in patterns and prominent in head shape. There are many strains and varieties of arhat fish. Generally, it can be divided into three strains: Hua Jiao strain, Jinhua strain and Pearl strain. No matter which strain of arhat fish it is, it has a graceful and plump figure, but it is flexible and lovely to swim. Especially the sarcoma on the top of his head is imagined as a symbol of longevity and wealth in many countries in Southeast Asia. Each arhat also has a unique ink spot, which is also imagined as various auspicious symbols. In this way, Luohan fish with longevity head is considered as a mascot to ward off evil spirits and avoid disasters, and gradually becomes another upstart among ornamental fish. So, how to choose arhat fish? The first thing to choose Lohan is to look at his head. Arhat has a fleshy head, a head and a hard head. At present, the most popular arhat head is the water head. Lohan's choice depends on his body color in addition to his head shape. Lohan's body color is mostly patterns and colors, and the most popular is pure red fish, which represents happiness and auspiciousness. Then look at the sequins and beads on the fish. The best thing is that the whole body and even the fins are surrounded by sequins and beads. This kind of fish is rich in color and beads, and looks bright and attractive. Then there are ink spots on the body, which is also an important criterion for the selection of arhat fish. "