A: China's freshwater ornamental fish.

The biconcave fish is commonly known as moss fish, pipefish, moss rat, algae-eating fish and scavenger.

The mouth of the double hole fish forms a sucker-like shape, by which it adsorbs on the surface of stones and other surfaces and scoops up algae on the surface of the stones. When kept in an aquarium as an ornamental fish, it can eat moss and algae on the surface of the glass and the bottom of the aquarium to make the water clear and the glass bright, so it is called a "scavenger" or "algae-eating fish".

The fish is gentle and easy to feed, in the aquarium requires weak alkaline water (PH 7.3 or so) suitable for the water temperature of 23-28 ℃, feeding some chopped leaves in moderation.

The two-hole fish is native to the Mekong River Basin, and has been kept as an ornamental fish all over the world.

The river triggerfish is commonly known as: boat Spanish mackerel, bubble fish, triggerfish, spicy head fish, chicken hugging fish, blowing belly fish, barbel fish and so on.

The river triggerfish has an oval body, a small mouth, incisors in the shape of plates, and scales in the shape of small spines. Its scales are very well developed, and when it encounters an enemy or is frightened, it will quickly inflate its swim bladder so that its abdomen expands rapidly and its whole body becomes spherical and floats to the surface of the water, and at the same time, the small thorns on its skin stand up, so that it can defend itself.

The river puffer is kept as an ornamental fish for its unique size and lifestyle. It has a mixed diet with a wide range of food, commonly including shrimp, crab, fish fry, insect larvae, branching horns, copepods, and branches and leaves of higher plants and filamentous algae. Fecundity is strong, and the reproductive season is from April to June.

Snakehead snakeheads are commonly known as mountain spotted fish, seven-star fish, point-weighing fish, mountain flower fish, black fish, otter fish, crowbar, and perch snakehead.

The body has 7-9 "eight"-shaped black horizontal bands, the tip of which is forward, and there is a black eye spot at the base of the caudal fin, which is surrounded by a pearl-colored bright circle, and there are many pearl-colored spots on the side of the body and the fins, which are glittering in the sunlight and are quite colorful.

The moon snakehead is highly adaptable, the survival water temperature 1-38 ℃, feeding water temperature is 12-32 ℃, the best growth water temperature is 15-25 ℃. Prefer shady, love holes, burrowing. Sexual ferocity, rapid movement. Food for animal omnivorous fish, fish, shrimp, aquatic insects as the main food. The first sexual maturity is 2 winters old, and the breeding period is from April to June. Parent fish have the instincts of pairing, nesting and protecting the young.

The snakehead is a valuable economic fish in China, and is also kept as an ornamental fish in Taiwan and other places.

The red perch, also known as river perch, is commonly known as Wudao black.

It is named for the five broader bands of spots across the back of its body. The red perch is a cold temperate river and lake fish living in northern Xinjiang. It grows slowly and reaches sexual maturity at the age of three winters, with the largest individual reaching a body length of about 500 millimeters.

The red perch is an important economic fish in the cold temperate zone of northern Eurasia, and in recent years it has been raised as an ornamental fish.

The fighting fish is commonly known as the Flower Handkerchief, Dragon Fish, Chinese Fighting Fish, Bodhisattva Fish, and Paradise Fish.

The fighting fish is loved for its brilliant body color and good fighting. There are more varieties of fighting fish, some with 8-10 blue-black horizontal bands on a gray-green background; or light brown body color with red and blue interactive horizontal stripes; or full body white with red eyes and so on. Fighting fish also have long, pointed dorsal, anal, and caudal fins, all of which are banded and edged in red on the edges of the grayish-black fins, which are even more brilliant when the fins are stretched out in heat.

The fighting fish is a small fish with a body length of 50-100 millimeters. Usually inhabits in small streams, ponds, farmland, river ditches and other slow-flowing or static water environment. Omnivorous, mainly feeding on zooplankton, insect larvae, but also eat filamentous algae. The optimal living water temperature is 23-24℃. Neutral alkaline water quality is required. Fighting fish has auxiliary respiratory organs, can directly use the air for internal exchange, in the aquarium dissolved oxygen is low can also survive. Once out of the water, it can live for a period of time without dying.

The fighting fish has a rough temperament, and when the males meet each other, they fight, especially during the breeding season, when the fighting is more intense. Fighting fish breeding while biting off the water plants or algae floating on the water surface, and spit foam, bonded into a bubble nest, spawning in the bubble nest. Breeding water temperature is about 26 ℃.

The goby is popular for its unique shape and good jumping, and it is a small individual, with a body length of only 40-80 millimeters.

It has a broad and large mouth, a pair of large eyes, two developed dorsal fins on the back, and the ventral fins on the ventral surface move forward to the chest and heal left and right to form a sucker. The body is darker in body color, with multiple black markings across the dorsum and scattered with many small black spots, the body color is extremely beautiful and quite lovely to look at.

The goby has a gentle temperament and prefers to live in clear, flowing water with a sandy or gravelly substrate. In the aquarium, it often crawls on the sand or glass surface, and sometimes it can use suction cups to attach itself to the glass or stones, which is very interesting.

The goby's food is mainly aquatic insects. The suitable water temperature for feeding is 18-26℃. The goby reaches sexual maturity in one year and breeds from April to May, making artificial reproduction difficult.

The long thin loach is commonly known as flower loach, flower loach, flower fish.

The body color is light gray-brown, fins are yellow-brown, and the body has two rows of dark brown spots, which is of high ornamental value. Because it is a bottom fish inhabiting rivers, it has high requirements for water quality and dissolved oxygen. It is aggressive and feeds on small fish. The general weight is 1.0-1.5 kilograms, and the maximum weight is 2.5-3.0 kilograms. The long thin loach is distributed in the upper reaches of the Yangtze River, especially in the Yangtze River Three Gorges gorge area tributaries.

Many species of loach fish similar to the long thin loach, can be used as ornamental fish breeding, such as purple thin loach, strong body loach, Chinese loach, etc., sand loach, loach group of fish live in the water body of the water flow is more gentle, the water quality and dissolved oxygen requirements than the thin loach fish, and more to the benthic organisms, algae, and plant debris and organic humus for food, easier to feed. Sand loach, flower loach and other fish are small fish, body length is generally 70-80 mm, body color, markings are very eye-catching, has a high ornamental value, widely distributed in China's Yangtze River and the south of the water system.

The threadfin perch, also known as the hairy-footed perch, is commonly known as the big airship, the Indian flying fish, the big walnut, and the three-star Mannong fish.

Line-footed bass body center and the root of the caudal fin and between the eyeballs are black dots, so in the ornamental fish industry is known as the "three-star Mannosaurus". The color of the body is gorgeous, especially in the male fish during the reproductive season. This fish in the natural environment in ponds, ditches, static water environment, the distribution area of poor natural conditions, so adaptable, strong body. The general water temperature is around 26℃, and the water quality is neutral or slightly acidic. Artificial breeding, the optimal water temperature of 23-28 ℃, the temperament is milder, easy to raise. When breeding, some aquatic plants should be placed in the aquarium to facilitate the building of bubble nests for spawning. Since it has the habit of eating small fish and weak fish, large and small-sized fish can not be kept in the same aquarium.

The threadfin perch is a small individual, and the adult fish is 100-150 millimeters long. Distributed in China's Xishuangbanna and Southeast Asia.

The rainbow lamprey is commonly known as the flower-link, big pangolin, gray pangolin, shikaiyi, shiyang, flower-waisted pangolin, five-bar pangolin, flaming pangolin, a-tu pangolin, flower olive fish, flower fish, and flower pangolin.

The rainbow lamprey is a group of fish that inhabit the lower and middle layers of rivers in the mountainous regions of the south. Individuals are relatively small, with a body length of no more than 150 millimeters. There are five horizontal yellow horizontal bands on the side of the body, which has a certain ornamental value. It feeds on the living algae. Individuals with a body length of about 100 mm reach sexual maturity. The breeding season is from February to May every year.

The ovaries and fat of the Rainbow Lipfish are poisonous, causing diarrhea and vomiting if eaten. Therefore, it is not used as a food fish, and in recent years it has been developed and utilized as an ornamental fish.

The Chinese carp is also known as stone carp, flower carp and mountain carp. The small trevally is also known as the black line pencil fish. The blackfin trevally is also known as the flower-flower daughter-in-law and flower-flower fish.

The cusk is a small fish. The Chinese trevally can be up to 200 millimeters long, the blackfin trevally is about 60-110 millimeters long, and the small trevally is only 50-80 millimeters long.

Trevally, trevally inhabits clear running or still water. Prefer to eat benthic invertebrates and aquatic insects, but also eat a small amount of crustaceans, shellfish, algae and plant debris. Robust, gentle temperament, like to swim in groups, easy to feed, can be single, can also be mixed. The water temperature is 18-26℃. Sexual maturity can be reached at the age of one fish. Spawning period March-May, spawning in batches.

The plough loach is also known as swallowfish, stone grub, cow's tail, long-tailed loach.

Distributed in the middle and lower reaches of the Yangtze River and its tributaries. It is a small benthic fish that inhabits the rocky beaches of mountain streams and rivers with fast currents. When living, the pectoral and ventral fins are spread out, adsorbed on stones to avoid being washed away by the water. It feeds on solid algae. It has very high requirements for water quality and dissolved oxygen. The reproductive season is from mid-April to early June.

Rhodeus sinensis is a group of small fish.

The largest individual does not exceed 200 millimeters, and most species are only 50-70 millimeters. The body is extremely laterally compressed and high, and the body color is bright and colorful, especially whenever the reproductive season, the male fish's colorful body color with the pearl star, more attractive. The female fish drags a long spawning tube during the reproductive season, which is even more distinctive in the company of the male fish.

The Rhodefish usually lives in still waters with lush aquatic plants and likes to swim in groups. Omnivorous, food for water plants, leaves of higher plants, algae, sedimentary organic matter, zooplankton, aquatic insects and branches and horns. The age of sexual maturity of most species is 1 year, and the longest life span is 4-5 years. Spawning period in April-June, the most prevalent in mid-May, spawning in batches.

The coelacanth is commonly known as purple flatfish, jade ring fish, yellow row, wood leaf pan, fire bream, red fish.

The body color of the coelacanth changes with its development and growth. The juvenile stage (body length of 25 mm or less) is grayish-white; the juvenile stage (body length of 30-80 mm) is brown, with three brownish-black horizontal stripes on each side of the body, and the fins are reddish with black spots. Mature individuals have a carmine-red body with a scarlet longitudinal stripe along the midline of the body and light red fins.

The juvenile carmine fish swims quietly and is very colorful. Adults are robust, with high and long dorsal fins, and are kept in the living room, presenting an auspicious mood of "bright future and smooth sailing".

The coelacanth has high requirements for water quality and dissolved oxygen. To the benthic invertebrates and underwater mud in the organic material for food, but also often sucked by mouth to ingest attached to the gravel on the bottom of the algae and plant debris, and so on. Generally, they reach sexual maturity at the age of 5, and the largest individual can reach 30 kilograms. It is currently used as an ornamental fish as a juvenile.

The coelacanth generally reaches sexual maturity at the age of six. The reproductive season is March-April every year, and it spawns many times in its life.

Sturgeon in the world *** there are 25 species, concentrated in the northern hemisphere, in China's rivers and coastal life there are eight species of sturgeon, of which three species are distributed in Xinjiang, two species in Heilongjiang, two species in the Yangtze River, one species in the Yangtze River to the Pearl River rivers and coastal.

The sturgeon is kept as an ornamental fish for its peculiar body shape. Sturgeon's head is plow-shaped, the mouth is inferior, the tail is crooked, and the back of the body has 5 rows of bony plates. Both juvenile and adult sturgeon have ornamental value, among which the Shi's sturgeon (distributed in Heilongjiang) has been formally bred as an ornamental fish since the success of artificial propagation of its juveniles.

The sturgeon has strict requirements for water quality, preferring to live in flowing water, high dissolved oxygen content, low water temperature, gravel substrate in the water environment. Age of sexual maturity, the Chinese sturgeon later, the male is 11 years old, weighing 50-100 kilograms, the female is 14 years old, weighing 160-250 kilograms; Shi's sturgeon males are 9-10 years old, females in the age of 10 years old or more; and the Darwin sturgeon is sexually mature earlier, weighing 10 kilograms of females and males of 5 kilograms have reached sexual maturity. Sturgeon feed on benthic invertebrates and small fish.

Small Tropical Fish - Subfamily Danidae and Subfamily Barbidae.

This is a large group of fish that live in tropical and subtropical mountain streams, small rivers and streams, small individuals, but colorful. The body length is less than 100 millimeters, mostly 50-70 millimeters. These fish have a mild temperament, like flowing water, strict requirements for water quality, feeding water temperature of 10-28 ℃. They feed on aquatic insects, and a few species are omnivorous. The aquarium substrate should be gravel and should not be planted with water plants. The age of sexual maturity is 1 winter age. , Shkaiyi, flower-waisted pangolin, five-barred pangolin, flaming pangolin, flower-livered pangolin, flower fish, flower pangolin, distributed in Yunnan, Guangxi, Guangdong, Hainan) and other species.