Ask the name of the fish. I bought it very cheaply today and forgot to ask the name. The head is flat and scaleless, a bit like a catfish, and it doesn't need to be slender.

There are many kinds of ornamental fish, which are widely distributed. Among them, there are about 2000 species of tropical fish, which are the main components of the ornamental fish family. They are distributed in tropical or subtropical fresh water or seawater. They were introduced to China from abroad in 1930s, and tropical fish farming was all the rage in the late 1960s and early 1970s. China has a long history of cultivating ornamental fish, which is the world-famous hometown of goldfish. Goldfish farming has been more than 800 years since the Southern Song Dynasty 1 174. /kloc-was introduced to Japan 0/500 years ago, to Europe 0/7th century, and to the United States 0/9th century. Now it has spread all over the world, with about 200 species, which is the main family of ornamental fish. Japanese koi also occupies a place among the ornamental fish in the world. Koi fish originated from 1906, when "German carp" and "Mirror carp" imported from Japan crossed with domestic carp and were cultivated for many years. Colorful, deeply loved by people, it was regarded as a "national fish" by Japanese, and was introduced to China in 1960s and developed. At present, there are about 100 species of ornamental fish in koi fish, which are called "Golden Dragon" and "Red Dragon" fish, belonging to the order Osteoglossidae. Originated in Indonesia, it is a large fish with a long body, flat side, a pair of beards on the side of mouth and snout. Its back, buttocks and tail fins are connected together, and its body is reddish, blood red and orange red. It is a fierce fish, suitable for water temperature around 27℃. Arowana is gorgeous and rich in appearance. It is regarded as a mascot in Southeast Asia, and it is extremely expensive in the ornamental fish market. The scientific name of arowana is Osteoglossum bicirrho-sum, which looks like a golden dragon, but its body color is silvery white, and it is also regarded as an expensive "feng shui fish". Pterophyllum scalare is known as the "queen of tropical fish", with the most species and the most beautiful appearance, commonly known as angelfish, belonging to Perciformes and Liliaceae. The Amazon river system originated in South America. Its body is prismatic, extremely flat, its head is small and sharp, its eyes are big, its back, buttocks and caudal fins are all long, its ventral fin is elongated and filiform, its body is silvery white, its side has four black stripes, its eyes are red, its caudal fin has yellow stripes, its personality is docile, it likes weak acidic soft water, its feeding temperature is 23 ~ 26℃, and it likes to eat animal feed. It is an egg-laying fish with its own spouse. Dendrolimus punctatus belongs to Cetacea, Cetaceae. It is very long and has a very beautiful flower tail, so it is also called peacock fish and rainbow fish. It is a small and beautiful egg-laying fish with mild personality, likes weak alkaline water and feeds on zooplankton. The suitable water temperature is 22 ~ 23℃. It is one of the most popular ornamental fish in the world. Tangyu, commonly known as Baiyunshan fish, belongs to CYPRINIDAE. Small fish native to Baiyun Mountain, Guangzhou, China, has a spindle-shaped body, 3-4 cm in length, big eyes, brown-blue back, silvery white abdomen, golden thread shining along the lateral line, bright red dorsal fin and caudal fin, and transparent fin. This fish is lively and docile, with miscellaneous eating habits and low temperature tolerance, and the optimum water temperature is 18 ~ 24℃. Capoeta semifasciolata, commonly known as golden thread fish and five elements fish, belongs to CYPRINIDAE. Originated in Guangdong Province and its neighboring provinces, it is a small fusiform fish, with a body length of 5 ~ 8 cm, golden yellow body and many brown patches scattered on the body surface. Its back, abdomen, buttocks and caudal fin are brick red and have strong adaptability. It can grow at water temperature 17 ~ 26℃ and eat animal feed. It is a kind of fish that lays eggs. Tangyu and Silurus meridionalis are both ornamental fish in China and a specialty of China. Crucian carp belongs to CYPRINIDAE, CYPRINIDAE. It is a small fish bred by wild crucian carp, which has great variation with wild crucian carp in external shape and body color. Goldfish like weak alkaline water, and the optimum water temperature is 20 ~ 28℃. It is an omnivorous egg-laying fish with a wide variety, dignified posture and elegant swimming posture. It is one of the most popular ornamental fish in the world and has a wide popularity. Koi fish belongs to CYPRINIDAE. Large fish, spindle-shaped, with colorful body surfaces such as red, white, yellow and blue, with various stripes, a pair of tentacles in front of the mouth, a pair of teeth in the snout, but teeth in the throat, large round scales on the body surface, dorsal fin in front of the ventral fin, long fin base, deeply forked caudal fin, preference for alkaline soft water and omnivorous eggs. Astronotus ocellatus, commonly known as map fish and piglet fish, belongs to Perciformes and Anthuridae. A large fish native to the Amazon River in South America, with a body length of up to 30 cm, oval shape, flat side, high body, large mouth, slightly sharp nose and mouth, long dorsal fin base, dark brown body, irregular orange and red patches on the side, which looks like a map, is highly adaptable to water quality and suitable for water temperature of 22 ~ 26℃. It is a carnivorous and fierce fish. The common name of Helostoma temmincti is kiss fish and kiss mouth, belonging to Perciformes, kiss family. This kind of fish is deeply loved by people because of its unique habits. Originated in Thailand, Indonesia and Malay Peninsula, it has a rectangular body, a flat side, a pink-white body, a dark red nose and mouth, and black vertical stripes on the head and tail fins. This kind of fish can kiss each other for a long time when they meet, which is very interesting. In fact, this behavior is a threat. This kind of fish likes to scrape green algae and has no strict requirements on water quality. The suitable water temperature is 22 ~ 26℃. Perch belongs to Perciformes, Percidae. Also known as China Betta Fish and Bodhisattva Fish. This fish is oval, slightly flat on the side, gray-blue on the side, with 10 red and blue stripes on both sides. Male fish have the habit of fighting and biting, just like crickets in water. This kind of fish does not require high water quality, and the suitable water temperature is 20 ~ 24℃. The white species of betta is white rabbit, pink and white, with red stripes on the side and red eyes. Dengyu is the general name of some fishes belonging to the genera He migrammus, Hyphes-sobrycon and Moenkhausis of CYPRINIDAE. They are petite, ranging in size from 3 to 5 cm to 65,438+00 cm. Their scales are shiny and shiny under the refraction of light. They are beautiful and suitable for water temperature of 22 ~ 24℃. Myxocyprinus belongs to CYPRINIDAE, Myxocyprinidae. It is also a unique fish in China. It is produced in the Yangtze River and Minjiang River systems in China. Its common name is Huang Pai and Huo Shao, with flat side, short head, small mouth, thick lower lip, many papillae, long dorsal fin base, brown body, three black stripes on the side, reddish fins and black spots. Very nice, won 10.