CATDOLL : CATDOLL: What is the best way to kill insects in aquatic products? What types of aquatic fish are there?

1. What is the best method for aquatic pest control?

In aquaculture, the best way to kill insects is to use organic manganese pesticides. Because organic manganese pesticides can quickly kill weeds and parasites in the water, have no toxic effects on aquatic animals, and can be decomposed in water without polluting the water quality. At the same time, organic manganese pesticides have different insecticidal effects on different types of aquatic animals, and can be selected and used according to specific circumstances. It should be reminded that before using organic manganese pesticides, the relevant formulas and instructions must be carefully studied to ensure the safety and effectiveness of use.

2. What varieties of aquatic fish are there?

Aquatic fish include abalone, grass carp, crucian carp, carp, silver carp, etc.

3. Which fish are special aquatic products?

Special aquatic fish should refer to farmed species other than conventional species (common fish and shrimp) that are farmed on a large scale, such as sea cucumbers, sea horses, sea urchins, jellyfish, economically farmed fish (rainbow trout, loach, catfish, mandarin fish, sturgeon, freshwater silver pomfret, tilapia, black snakehead, etc.), river crabs, frogs, and turtles, which are special farmed animals with relatively high economic value and relatively small farming scale.

4. How to issue an invoice for live aquatic fish?

Live aquatic fish are agricultural products and are duty-free products with a zero tax rate.

5. What is the distribution of economic fish species in China’s aquatic products?

The main economic fish species in China's water systems are:

(1) Heilongjiang River System: The Heilongjiang River is the northernmost river in my country, with a total length of 4,485 km, and a section of the river within my country and on the border of 2,965 km. Its main tributaries include the Songhua River, the Wusuli River and the Huma River, and its main lakes and reservoirs include Hulun Lake, Songhua Lake, Xingkai Lake, Jingbo Lake and Wudalian Lake. There are about 100 species of fish, the main species of which are silver carp, grass carp, bighead carp, carp, crucian carp, black carp, silver carp, bighead carp, and mandarin fish; there are many cold-water fish, such as lamprey, taimen, fine-scaled fish, whitefish, pike and burbot; as well as endemic species such as Acipenser schrenckii, sturgeon and silver carp, and the famous migratory fish salmon.

(2) Liaohe River System: The Liaohe River is located in the southern part of Northeast my country. It flows through Hebei, Inner Mongolia, Jilin and Liaoning, and flows into the Bohai Sea. It is 1,430 km long. The upper reaches are the two major tributaries of the East and West Liaohe Rivers. The Dahuofang Reservoir, with an area of ​​112 m2, is built on the Hunhe River, a tributary of the Liaohe River. There are 90 species of fish, and the number of cold-water fish has decreased significantly. Only lampreys and variegated sculpins are left. The common species in the south, such as yellow eels, sand tang snakeheads and spiny loaches, are distributed in the Liaohe River, but not in the Heilongjiang River system. The main economic fish are carp, crucian carp, yarrow and catfish; the common fish are yellow catfish, bream, bream, red-eyed trout, black carp and black snakehead.

(3) Haihe River system: This is a large river located in Hebei Province, originating in the northern part of Henan Province, with a total length of 1,090 km. Its main tributaries include the Baihe River, Yongding River, Daqing River, etc. The largest affiliated water body is Baiyangdian, with an area of ​​366 km2. There are more than 1,000 reservoirs of various sizes built, including the Guanting Reservoir (144 km2) and Miyun Reservoir (186 km2). There are about 100 species of fish, and the important economic fish include carp, crucian carp, catfish, yellow catfish, red-eyed trout, bream, bream, black snakehead, and mandarin fish. There are no cold-water fish.

(4) Yellow River system: The Yellow River is the second largest river in my country, with a total length of 5,464 km and a drainage area of ​​75 million km2. There are many lakes in the source section of the river, and large reservoirs have been built on the main stream, such as the Sanmenxia, ​​Liujiaxia, and Qingtongxia reservoirs. There are 140 species of fish, with fewer species in the upper reaches, only more than 10 species, mainly plateau-specific fish such as schizothorax. The main species in the middle and lower reaches include carp, crucian carp, red-eyed trout, northeastern yarrow, catfish, thorny goby, Yellow River goby, flat-fin loach, multi-scaled shovel-jawed fish, etc. The unique fish include the northern copper fish. The Yellow River carp is regarded as a delicacy in my country and has always been praised by people.

(5) Huaihe River system: The Huaihe River originates from Tongbai Mountain, flows through Henan and Anhui provinces, flows into Hongze Lake in Jiangsu, and finally flows into the Yangtze River through Gaobao Lake from Sanhe. It is 900 km long. There are many lakes in the Huaihe River system, including Hongze Lake (1,960 km2) and Gaobao Lake. Reservoirs include Fuziling Reservoir and Meishan Reservoir. There are 81 species, which are connected with the Yangtze River and the Yellow River, and the fish composition is similar to them.

(6) Yangtze River system: The Yangtze River Basin is one of the richest regions in my country and also the most developed fishery region in my country, accounting for about two-thirds of the country's fish production. There are more than 300 species of fish, of which more than half are carp fish. Fish in the Jinsha River section include schizothorax, and more than 190 species of fish in the Sichuan River. The main fish species are those that are suitable for living in rapids, such as species of the subfamily Hylidae, Hylidae, and Hylidae. The main economic fish are carp and copper fish, accounting for more than half of the catch. The middle and lower reaches of the Yangtze River are rich in fish, with many economic fish species, including the four major carps, as well as carp, bighead carp, minnow, bighead carp, bream, bream, red-eyed trout, long-snout catfish, catfish, and mandarin fish. Migratory fishes account for a considerable proportion of the fisheries in the middle and lower reaches. The spawning grounds of shad are mainly in the Gan River. Coilfish and dark-striped pufferfish are mostly found in the lower reaches. Songhua perch is a famous product of Songjiang, a tributary of Huangpu River. Anchovy coilfish and premaxillary silverfish mainly live in the estuary. The Yangtze River system is not only rich in fish, but also rich in natural fish fry such as the four major carps, which reached 13.25 billion in 1957.

(7) Qiantang River system: Qiantang River is the largest river in Zhejiang Province, with a total length of 500 km. The various sections of the river are called Changshan Port, Lan River, Fuchun River and Qiantang River. Its estuary has the famous Qiantang River tidal bore. Xin'anjiang Reservoir (now called Qiandao Lake) is built in this river system. There are more than 100 species of fish, and Fuchun River has historically been rich in shad.

(8) Minjiang River System: The Minjiang River is a large river on the southeast coast, with a total length of 577 km. It originates from Wuyi Mountain and flows into the East China Sea in two branches east of Fuzhou. There are about 100 fish species, with many species of the subfamily Hylidae and Hylidae. Myxocyprinus and tropical climbing perch are also found. The main economic fish species are carp, spiny barb and catfish. Flower eel is a local specialty.

(9) Pearl River system: The Pearl River system consists of the Xijiang River, Beijiang River, Dongjiang River and the Pearl River Delta. The Xijiang River is the main stream, with a total length of 2,210 km. The upper reaches of the Xijiang River are divided into the Nanpan River (originating in Yunnan) and the Beipan River (originating in Guizhou); the Beijiang River originates from Xixi Bay in Xinfeng County, Jiangxi Province, with a total length of 468 km; the Dongjiang River originates from Dazhuling in Xunwu County, Jiangxi Province, with a total length of 523 km. There are 294 species of fish, the main economic fish are carp, crucian carp, silver carp, bighead carp, grass carp, dace, bream, bream, red-eyed trout, croaker, barbel, etc. There are many endemic species, such as the bearded crucian carp, the mullet, the leaf knot fish, the spotted bream, etc. The red stingray is originally a marine fish, but it can survive and reproduce in the fresh water of the Pearl River system. The Chinese sturgeon and the shad can also be seen.

(10) Lancang River and Nu River system: The Lancang River originates in southern Qinghai, flows through eastern Tibet and northwestern Yunnan, and flows out of the country at Xishuangbanna Dai Autonomous Prefecture in Yunnan, entering Laos, Thailand, Cambodia and Vietnam. After leaving the country, it is called the Mekong River. It is 4,500 km long, and the Lancang River in my country is 1,612 km long. The Nu River originates in the Tanggula Mountains in Tibet, flows through Yunnan and enters Myanmar. It is 3,200 km long, and my country accounts for 2/3 of the total length. There are relatively few fish species in the Lancang and Nu rivers, mainly schizothorax and loach.

(11) Yarlung Zangbo River System: The Yarlung Zangbo River is a large river in Tibet, my country, with a total length of 2,057 km. It originates from the glacier area at the northern foot of the Himalayas and finally flows into India. The river has a large drop in elevation and few fish species. The main fish species are schizothoracic fish and barbel fish.

(12) Taiwan and Hainan: The longest river in Taiwan is the Zhuoshui River, which is 186 km long. There are about 70 species of freshwater fish, mainly carp, crucian carp, black carp, grass carp, silver carp, bighead carp and fish of the subfamily Barbinae. All rivers in Hainan originate from Wuzhi Mountain. The largest river is the Nandu River, followed by the Changhua River and the Wanquan River. There are about 85 species of freshwater fish, of which more than half are species of the subfamily Barbinae, Sphenodontinae and Gobiinae.

(13) Tarim River system: The Tarim River is the longest inland river in my country, with a total length of 2,137 km. It originates from the Pamir Plateau and Kunlun Mountains, circulates in the Tarim Basin, and flows into Lop Nur and Taitema Lake. There are very few fish species, mainly species of the subfamily Schizothorinae and the subfamily Triplophyinae. Bosten Lake is the largest fishery base in Xinjiang.

(14) Irtysh River system: The Irtysh River is an outflow river in northern Xinjiang and belongs to the Arctic Ocean system. It originates from the southern slope of the Altai Mountains, is 546 km long in my country, and flows into Russia. There are more than 20 species of fish, including carp, northern pike, Arctic grayling, mullet, taimen, and perch. In addition, there are black crucian carp, small-bodied sturgeon, Siberian sturgeon, and burbot.

6. What fish species are farmed in Blue Potion Aquaculture?

Mini parrot fish. Blue water medicine is the common name for methylene blue. In order to prevent the occurrence of saprolegniasis, care should be taken to avoid damaging the fish body and parasite bites during operation, and a small amount of salt can be added to the water to inhibit the occurrence of saprolegniasis.

When the fish is found to be infected with Saprolegniasis, you can use: 1. Soak in 1-2ppm methylene blue solution for 20-30 minutes, or soak in 5ppm furazolidone solution, or directly sprinkle 0.02ppm malachite green solution or 0.3ppm formaldehyde solution into the aquarium to inhibit the growth of mold. You can also increase the water temperature to inhibit the growth of Saprolegnia. Install a 15-watt ultraviolet lamp on the top of the aquarium and irradiate it for several hours every day to effectively inhibit or eliminate the growth of Saprolegnia. 2. Soak in 3% salt water once a day for 5-10 minutes each time. 3. Soak in 2ppm potassium permanganate solution plus 1% salt for 20-30 minutes, or soak in 1-2ppm malachite green solution for 20-30 minutes.

7. What is the application of dimehypo in aquaculture?

Pesticides are widely used in aquaculture, so the correct and reasonable use of pesticides is particularly important. It is necessary to understand its characteristics, dosage, precautions, etc. in order to use it correctly and reasonably.

1. Characteristics of aquatic pesticides:

It has a bad smell, is highly toxic, is prone to drug resistance, and is for external use. Among them, pyrethroids and organophosphorus are both broad-spectrum insecticides, and mebendazole is a typical special insecticide.

2. Dosage of insecticide:

1. In most cases, in normal temperature aquaculture water, the use of pesticides requires increasing the dosage to achieve a good effect in a short period of time. Generally, it is increased by 30%--100%. If there is still no effect or very poor effect after increasing the dosage to 100%, do not increase the dosage, but check whether the diagnosis is wrong, whether the usage is appropriate, whether there are offset factors in the water, etc.

2. At low temperatures, organophosphorus pesticides and other pesticides have a slower effect, so do not increase the dosage or use them continuously;

3. When determining the dosage, weather factors and the tolerance of each aquaculture species should be considered. For example, silver carp and bighead carp are sensitive to organophosphates and pyrethroids.

4. The dosage should be reduced when the breeding individuals are in the immature stage, usually by half.

3. Precautions for using pesticides:

1. When the water depth is greater than 2 meters, it is best to use the drug in two doses or use it up at once with an aerator turned on;

2. The effect is often better when applied before feeding, but it is easy to affect the feeding capacity of the cultured organisms;

3. If the water is too concentrated, you can use disinfectant first and then insecticide to improve the effect;

4. Try to use it on sunny days to prevent the head from floating due to lack of oxygen;

5. Within 48 hours after use, patrol the water every 2 hours to observe whether aquatic organisms are abnormal. If any abnormality is found, take appropriate measures immediately. In particular, you should not sleep or rest on the night of medication, otherwise accidents are likely to occur.

8. What kinds of fish live in the lake in winter?

1. Crucian carp. Crucian carp is a bottom-dwelling freshwater fish that usually lives in the lower layer of the water. It has a strong ability to adapt to the environment and is resistant to low temperatures. It can feed in water between 0 and 30 degrees Celsius. Although crucian carp's feeding activity is slightly slower than usual when the water temperature is low, there will still be a good bite. When fishing for crucian carp in winter, the bait should be mainly fishy and fragrant. If it is live bait, the effect will be better.

2. Carp. Carp's ability to withstand low temperatures is slightly worse than that of crucian carp, but it is not impossible to fish for carp in winter. In natural waters with a water temperature above 10 degrees Celsius or in winter fishing greenhouses, you can still fish for carp if you use live bait such as red worms.

3. Black carp. Black carp is also a bottom freshwater fish. Although black carp is a carnivorous fish, it is docile, lazy and inactive. In winter, black carp can be fished in many places in the south. As long as you use bait, it is not difficult to catch a big black carp. The bait for fishing black carp should be fresh, fishy and fragrant. Using snails soaked in small green ring medicine, corn, wheat or granules will have a good effect of attracting fish.

4. Willow Root Fish. Willow Root Fish is a cold-water fish native to the Northeast. It mostly lives in small rivers and mountain streams with low water temperatures and clear water. Willow Root Fish is an omnivorous fish that feeds mostly on flying insects, aquatic organisms and algae. Using bloodworms or larvae of water worms to fish for willow root fish is more effective. Moreover, willow root fish tastes very delicious and is a top-notch delicacy in winter.

9. How to use aquatic tea bran to kill insects?

1. Aquatic tea bran can be used to kill insects. 2. Aquatic tea bran contains certain organic acids and volatile components, which can kill some pests in aquaculture. How to use: Sprinkle the aquatic tea bran on the water surface or put it directly into the water to let it release the active ingredients naturally. 3. It should be noted that when using aquatic tea bran to kill insects, the dosage should be controlled to avoid affecting the water quality. At the same time, it is also necessary to pay attention to not causing harm to beneficial organisms in aquaculture.

10. Is it necessary to kill insects for koi in winter?

need

Carp need to be disinfected regularly during the winter. During the winter, fish are susceptible to printing disease, saprolegniasis, trichophyton, filariasis and tubeworm disease, so before the fish are put into the pond, appropriate drugs should be selected according to the actual situation to soak the fish body.

When there is a possibility of disease occurring, quicklime or other drugs should be added to prevent fish diseases. Once fish diseases break out in winter, they are most difficult to cure.