What does cold water fish mean?

Question 1: What fish belongs to cold water fish? Cold-water fish is a kind of fish, mainly according to the requirements of fish for the living environment, especially the water temperature. When the water temperature is higher than 20 degrees, people can't survive, so it is called cold-water fish.

Like carp, grass carp and crucian carp, it has a wide range of suitable temperatures and is generally classified as warm-water fish. In recent years, some tilapia, freshwater pomfret and rainbow trout will freeze to death if their water temperature is below 15, so they are classified as hot water fish.

Question 2: What is cold water fish? In the early years, there were no fish in Sailimu Lake. After years of research and development, from 1998 to 2003, 29.4 million eggs of whitebait and whitebait were imported from Russia for six consecutive years, and the fry of whitebait and whitebait140,000 were released into Sailimu Lake through hatching. By the end of 2002, the average weight of high whitebait in Sailimu Lake was 65438 0.9 kg, the average weight of female fish was 2.2 kg, and the largest individual was 3.6 kg. In 2002, it entered the commercial fish fishing period and caught more than 30 tons of commercial fish. In 2003, it is planned to catch 65,438+000 tons of commercial fish.

From 2000 to 2002, Xinjiang aquaculture farmers fished, collected eggs and inseminated parent fish in Sailimu Lake, and then transported them to the hot spring cold water fish breeding base for artificial incubation. After about 4 months' incubation, more than 1 1 1,000,000 live larvae of high white croaker were obtained for the first time in China. The success of high whitebait culture in China for the first time indicates that the development of cold water fish series has entered a new stage. The first batch of fry has been extended to Beijing, Sichuan, Heilongjiang, Inner Mongolia, Qinghai and other provinces. In 2003, 800,000 fry were transported to Heilongjiang and Inner Mongolia. At present, a fishery pattern with high whitebait, concave whitebait, rainbow trout and golden trout as the main bodies has been initially formed. The production mode of transplantation, value-added, reproduction and fishing has steadily improved its economic and social benefits.

High whitebait has strong adaptability and is especially suitable for some low water temperature environments. The meat is delicious, there is no muscle thorn, and it grows rapidly. High whitebait mainly feeds on the natural bait of Sailimu Lake-hooked shrimp and mackerel. Because the high whitebait completely feeds on natural bait, the lake water is not polluted (mainly snowmelt water, mountain precipitation and spring water), and it is worthy of the name as an organic food in fish, with broad market prospects.

Question 3: The species of cold-water fish are the general name of CYPRINIDAE. For small freshwater fish, the longest is only180 mm; The body is oval or diamond; Short head and small mouth; Must be 1 or none; The anal fin begins below the base of dorsal fin, and the dorsal fin and anal fin are quite long, with or without hard spines; Abdominal position of ventral fin; Tail fin bifurcation; Whether the lateral scales are complete or incomplete. Mainly distributed in East Asia, China, South Korea and Japan. There are about 5 genera 2 1 species in China. Male fish with special breeding habits have obvious wedding decorations and bright colors. Can be cultivated for viewing. Several carp-like fishes in the family Cyprinidae are famous for their unique breeding methods. Native to clear and stony streams in central and southern Europe. There is almost no economic value. It is silvery white and about 5 ~ 7.5cm (2 ~ 3) long. April-June is the spawning period every year. At this time, the male fish's abdomen is orange and his fins are reddish; The oviduct of the female fish extends into the oviposition tube and can be inserted into the water inlet tube of freshwater mussels to lay eggs in the gill cavity. When the mollusk breathes, the water of the male fish nearby is sucked into the gill cavity, and the sperm and the egg are combined. Eggs develop in the gill cavity of mollusks, and after about one month, young fish leave the host. Just in line with the breeding period of mollusks, mollusks will also arrange larvae on their bodies and bury them in their skin for a period of time. For a group of small fish. The largest individual is less than 200 mm, and most species are only 50-70 mm, with extremely flat sides and bright body colors. Especially in the breeding season, the bright body color of male fish plus pearl star is more attractive. Female fish drag a long oviposition tube during the breeding season, which is even more unique with the company of male fish. The longest service life is 4-6 years. The spawning period is from April to June, reaching the peak in mid-May and spawning in batches. The scientific name of freshwater fish belonging to the order Perciformes-Sunfish; Perch is native to fresh water in the southern United States and northern Mexico, as well as in the central and southern United States. Adult fish are generally 24-40 cm long. Suitable water temperature: 18-25℃. Water quality requirements: total hardness (GH): 8- 1 1 dgh, pH: 6.8-7.5. North American freshwater fish, belonging to Perciformes (Echinocheidae), is the same as Berry Perch and Black Perch. There are about 30 kinds. They are all native to North America, and they are all native to the waters east of the Rocky Mountains, except Archoplites interruptus. Among them, several species, such as Lepomis gibbosus or Eupomotis gibbosus, have been introduced to other countries. Molas are taller; A continuous dorsal fin is composed of anterior spines and posterior fins. These two parts may have a notch (like bass), but they are not separated like the dorsal fins of related bass. It is a typical fish in still water lakes and ponds. Carnivorous, feeding on fish and aquatic invertebrates. Body size ranges from 2.5 cm (1) to about 80 cm long and weighs about 10 kg (22 lbs). Molas are small (generally less than 20 cm long), but they are considered to be excellent food fish and fishing fish. Some species of gill covers have a distinct flap, or earlobe, on the upper edge of the back. It is taller and more vivid than sea bass, as its name implies. In the spring breeding season, the male fish is particularly beautiful and has the same habits as other Japanese bass. The male fish digs the nest with his tail to guide the female fish to lay eggs, and then guards the eggs and sometimes the young fish. People are familiar with molas, such as Enneacanthus chaetodon (produced in the eastern United States), Lepomis macrochirus (a famous food and fishing fish with light green body color and blue abdomen, head and lower edge of gill cover), long-eared molas (L. megalotis, with orange spots and bright blue wavy stripes) and melon molas (green or light blue, with orange abdomen, There is a red spot on the ear leaf) and Ambloplites rupestris (a kind of food and fishing fish with light green and irregular dark stripes). Most molas have prominent colors. The most striking species among the beautiful molas is Chang 'e. Its dazzling metallic blue fish is covered with orange spots, and there are a pair of ear-shaped patterns at the back of its dazzling beautiful eyes, which is their obvious sign. It's hard to imagine that Chang 'e, with such gorgeous body color, turned out to be a freshwater tropical fish! The Goddess Chang'e flying to the moon >>

Question 4: What cold-water fish is bigger than white-spotted pike? Although white-spotted pike is distributed in alpine regions, it belongs to sub-cold-water fish, with relatively wide adaptation temperature and strong adaptability. The adaptive temperature range is 0℃ ~ 30℃, and it can still survive at 35℃, and the optimum feeding temperature is 16℃ ~ 26℃. The maximum single weight can reach 40kg. Young fish move in groups, and adult fish scatter for food. They are quick and agile, and often move in aquatic plants. Colorful Salmon: Colorful carp is the smallest of all salmon, generally weighing less than 2 kg (the highest record is 8 kg). But colorful salmon is also the most beautiful color of all salmon. Dr Fredikov, a Canadian aquatic scientist, called it the "Queen of Ice Water", and it really deserved its reputation. The female fish has sharp teeth and is extremely fierce! Colorful salmon likes to grow in cold water, and the optimum water temperature is about 10- 15℃. But as long as the water temperature does not exceed 20℃, it can generally grow. Its limit water temperature is 3℃ and 25℃. If you don't eat above 20 degrees, you will die at 25 degrees. The requirements for pH are relatively loose, and the pH value is about 4.0-9.8. Siberian sturgeon: All sturgeons sold in China are hybrids of Siberian sturgeon and Acipenser schrenckii. Because pure sturgeon can't withstand the high temperature in summer, and hybrid sturgeon can withstand the high temperature in summer, it is very suitable for aquarium culture, and can grow to the width of your aquarium at most. The maximum hair length of Siniperca chuatsi in Lijiang River is 15 cm, which is a cold-water fish species and an indigenous fish species. More fierce. Siniperca chuatsi has a slightly sharp head, a big mouth and a slightly protruding jaw. The nose is far from the front edge. Maxillary and mandibular canine tooth hypoplasia. The gill harrow is generally 7. The pylorus is flat and unbranched, with three leaves. The scales of the same kind of fish are slightly larger. There are three narrow black stripes on the branchial lid at the posterior edge of the eye, and a black spot on the upper corner of the posterior branchial lid bone. I like living in running water. The individuals are small and distributed in the main rivers of Zhejiang, Guangxi and Hainan Island. Mandarin fish: almost all rivers, lakes and seas from Guangdong in the south to Heilongjiang in the north, but the middle and lower reaches of the Yangtze River are the most. For more than 20 years, Siniperca chuatsi resources have been in a stable state, and have been steadily rising. Since 1958, nursery work has been widely carried out in various places, and young mandarin fish have been properly put into newly built large and medium-sized reservoirs. Siniperca chuatsi feeds on low-quality miscellaneous fish in the water, so when raising domestic fish, put some Siniperca chuatsi fry properly to remove wild miscellaneous fish in the pond. Rare bottom fish in warm rivers, lakes and rivers. Breeding habits vary greatly with the growth rate in different waters. But on the whole, Jiangnan is faster than the north. In natural waters, the maximum individual length of Siniperca chuatsi can reach more than 800 mm and its weight is 7.5 kg. Sexual maturity is early, sexual maturity is 2 years old, and the smallest individual with sexual maturity is 2 10 mm, weighing 250 grams. It is a batch spawning fish, which can spawn many times in its life. The spawning period is from May to August, and a few can be extended to August. Most of them lay eggs at night. The eggs are floating, round, yellow and have oil balls. Egg diameter 1.2- 1.4 mm, after fertilization, the egg belly expands, the egg diameter is about 2 mm, and the average number of eggs conceived is between 2.7-265,438+0.3 million, which is lower than the size of fish. The water temperature is 265,438+0-24℃ for 72 hours, and the newly hatched larvae are 4.2-4.4 mm long, carnivorous benthic fierce fish and predatory feeding mode. Mainly preys on small fish and shrimp. After the yolk sac disappears, the newly hatched larvae are ready to feed on the larvae of large zooplankton and other fish; When the body length is 40-50ypoy, it preys on shrimps, and when the body length is 95 mm, it is eat small fish besides shrimps. The feeding intensity is the strongest in summer, and it breeds.

The distinctive feature of platypus is that its snout is flat, paddle-shaped and extremely long. This fish has a smooth and scaleless body surface, a black, blue and gray back, some spots inside, a little ochre on the side and a white abdomen. The life span of paddlefish is more than 30 years, and the individual is large, and the largest one has been found to be 65 kg. Sexually mature for more than 8 years. It has a wide temperature range and can survive in frozen water and at 32℃. The requirement for dissolved oxygen is higher, above 5-7 mg/L, and its feeding habit is similar to that of bighead carp. It feeds on zooplankton, and artificial culture can assist in feeding some compound feed. The growth rate is faster than that of common freshwater fish, and it can grow to more than 0.5 kg, 2-year-old fish10.5 kg and 3-year-old fish/0.5 kg. Silurus meridionalis belongs to warm-water fish, and the suitable water temperature for survival is 0 ~ 38℃, for growth is 12 ~ 30℃, and for growth is 25 ~ 28℃. Dissolved oxygen in water 3 mg > >

Question 5: What are cold water fish and hot water fish? Both fish are edible fish.

Question 6: What are cold-water fish and sub-cold-water fish? The four big fish are not cold water fish. If the water temperature exceeds 20 degrees for a long time, cold-water fish can't survive.

Question 7: What kind of fresh and cold water fish is good and beautiful?

Similar in shape to a round-tailed betta. The ventral fin has 1 segmented fin, especially the male fin and the caudal fin are bifurcated. Most of them live in shallow water areas such as mountain ponds, rice fields and springs, and feed on invertebrates. During the breeding season, males spit foam into nests and gather their eggs in the nests. Males have the habit of protecting their nests. Small size, bright body color and aggressive male fish are famous ornamental fish. Distributed in the upper reaches of the Yangtze River and southern provinces.

gingkgo

Fork-tailed betta

boundary

animal kingdom

door

chordate

summary

fish

eye

Perciformes

The branch of academic or vocational research.

Bettico

belong to

Betta

Six comments

1 China Betta Editor

It belongs to the genus Betta, a subfamily of Betta.

The scientific name is Paradise Fish/Paradise Gouramis/Macropodus Opecuiaris (Linnaeus).

Basic information

China Betta [1], also known as:

Albino fork-tailed betta

Crocodile fighting fish, rabbit fish, paradise fish, etc. Longyan people are called "friends" or "three points". Yangjiang area is called "fart frequency". Pingnan, Fujian called it "Ping Pong Lion". Meizhou area is called "Silk Tribute". In the past, it was found everywhere in wild streams, rivers and rice fields in the south of China. Because of its subtropical distribution, China Betta can survive well in the low water temperature environment above 0℃ and grow well in the water temperature above 14℃. Now, because water pollution is almost extinct, it is rare.

Frank, a famous German ornamental fish expert? Schaefer's evaluation of the fork-tailed betta in the complete works of gill silk is: "The earliest tropical ornamental fish is also one of the most beautiful fish species so far."

Vietnamese black fork-tailed betta

In western countries, China Betta is one of the most popular ornamental fish species, and it is called paradise fish.

Question 8: What are the cold-water fish in China? They refer to those fish whose water temperature is higher than 20℃.

trout

rainbow trout

Yayu

Spotted yellow croaker

Naked yellow croaker

Silver-rumped scale fish

Ilikazak hip scale fish

Yarrow Baikal Lake

Huqiao