How to raise puffer fish
1. Bait feeding
Pufferfish into the pool, the water temperature at 15 ~ 17 ℃ still have the ability to feed, should be fed regularly. In the early stage of entering the pool, first bait feeding, so that the river puffer to form a habit of fixed-point feeding. Feed wet pellet bait, feed it now, the daily feeding amount is 0.5%~3% of the weight of the river herring, and feed it 1~2 times a day. When the water temperature is below 12℃, the food quantity of river herring decreases significantly. When the water temperature is 10℃, the river herring basically no longer feeds, and then the baiting should be stopped. When baiting, you should try to make the river puffer eat well, and fish out the residual bait in time after baiting to prevent the deterioration of water quality. A small amount of vitamins E and C can be added to the bait to prevent nutritional diseases.
2. Water quality management
When wintering in high density, it is necessary to maintain good water quality, preferably with sterilized water. The water temperature is suitable, the river puffer can still feed, need to bait, the pond should generally change all the water, and should be continuously inflated; the water temperature is low, the river puffer stop feeding, the amount of water change can be reduced to 10% to 30% of the pond water, intermittent inflatable, each time inflatable for 30 minutes, stopping for 30 minutes. Aerating should be strengthened every night to prevent fish death due to lack of oxygen from stopping. Pool of feces, residual bait and water table was membrane, dirt should be cleaned up in a timely manner to prevent pollution of water quality.
3. Fish disease control
River triggerfish indoor overwintering density, prone to disease. Fish species should be medicated before entering the pool, remove body surface parasites, and prevent injured individuals from being infected with bacteria or water mold. During the overwintering period, prevention should be the main focus, generally every 10 to 15 days, with antimicrobial drugs to disinfect the body surface; can also be every 15 to 20 days continuous feeding of antimicrobial-containing bait for 3 days, to disinfect the body. The fish that have been sick should be fished out in time and isolated for treatment to prevent the spread of fish disease.
4. Water temperature control
In the wintering process of river herring, we should always pay attention to the change of water temperature and weather forecast, and we should be well-prepared before the cold wave, to ensure that the warming device can operate in time. When the indoor water temperature is lower than 12 ℃, warming measures should be taken to raise the water temperature to about 14 ℃ and control constant.
5. Invert the pool to change the water
The water change can reduce the number of metabolic wastes and germs in the water, so that the water environment can be improved. Pouring the pool can periodically thoroughly disinfect the pool, kill harmful organisms and parasites in the pool, improve the pool water environment, reduce the occurrence of fish disease, and improve the survival rate over winter. Generally, the pool should be emptied once a month to thoroughly disinfect the overwintering pool. Pouring the pool is best to use the neighboring pool, which can reduce labor intensity, and use the siphon method to suck the upper pool water to the disinfected pool. Generally 1 to 2 times a day suction, feces, residual bait and other dirt sucked to the outside of the pool to reduce water pollution. At the same time, the water is changed or replenished once a week, and the amount of water changed is 1/5 to 1/4 of the pool water.
How to eat pufferfish
The muscles of pufferfish are as white as frost, and the meat is rich in flavor, tender, and delicious, with high protein content, and rich in nutrients. Only the liver, reproductive glands and blood contain toxins, which can be eaten after treatment. After pickling, it is commonly known as "wolf replica watches". The ovaries can be extracted tetrodotoxin crystals for medical use.
The body of puffer fish is rich in DHA, EPA, and the human body is necessary and can not synthesize the eight kinds of "amino acids" and a variety of trace elements. The content of selenium and zinc, which have anti-cancer and anti-aging effects, is higher than that of turtle and sea cucumber. Safe consumption of river herring has the effect of strengthening human immunity, tonifying the brain, improving eyesight, inhibiting tumors, etc. In addition, river herring has the effect of strengthening the stomach, strengthening the brain, improving eyesight, and inhibiting tumors. In addition, river triggerfish also has stomach-healthy stomach effect.
Asia's Japan, Korea and China are extremely favorite to eat river herring; anyone who has tasted it praised: "do not eat river herring, do not know the taste of fish." Consumption of river herring meat, in addition to tasting its freshness, but also to reduce blood pressure, treatment of waist and leg weakness, restore energy and other functions. To consume river herring, the first thing to do is to keep the muscle fresh, and the processing should be extremely strict. The method is to cut open the fish along the spine, tear off the panel, cut off the head, dig out the internal organs, the fish in the water repeatedly wash, thoroughly remove the blood before eating.
A ton of fresh river herring meat is exported for up to more than $3,000 U.S. dollars. In Japan, each catty of live fish is more than 40 yuan and demand exceeds supply. Japanese organizations, in order to meet the needs of the Japanese people on the river herring, many times with the relevant aspects of our consultations, hope that the river herring fish imported from China. In addition to fresh food, it can also be pickled, pickled into salted dry products, safer to eat. Curing method is: the cleaned fish, plus 5 to 10% salt pickling, half a month out of the sun, such as in the pickling process to add a certain amount of alkaline substances, such as sodium carbonate, etc., can be more effective in destroying the toxins of the river herring.
Life habits of the pufferfish
Migratory
The pufferfish swims from the outer sea to the salty and freshwater areas at the mouths of rivers and streams in March each year to spawn. The only dark-colored pufferfish ***Fugu obscurus , English name: Obscure puffer*** a group of anadromous into freshwater, May to June in the river there are spawning; carrying egg volume is generally between 4 to 50,000 grains. Fall water temperature drops, began to descend the river, and other species like swimming to the deep sea area, early December returned to the deep sea area overwintering. The young fish born that year live in the rivers or lakes through the river, and return to the sea only in the spring of the following year, growing up in the sea to sexual maturity and then re-entering the rivers to spawn. The river herring that enters the Yangtze River spawns in the middle reaches of the river or Dongting Lake and Poyang Lake from April to June.
Food
The river herring has a mixed diet, feeding on fish, shrimps, crabs, shellfish, but also eating insect larvae, branchiopods, copepods, and leaves of higher plants and filamentous algae. During the reproductive migration period is generally rarely ingested.
Self-defense
River puffers are *** large and rely mainly on their pectoral fins for propulsion. Such a body size makes it an easy target to hunt, even though it can rotate nimbly but not quickly. As a result, river herring have evolved a self-defense mechanism that is quite different from that of normal fish. When threatened, river herring are able to quickly draw water or air into their highly elastic stomachs, expanding several times their size in a short period of time to scare off predators. The spiny river herring, a member of the Spiny Puffer family, is even armed with spines, which rise up all over its body when it expands, making it difficult for predators to swallow it.
The most toxic parts of the pufferfish
The most toxic parts of the pufferfish are the gonads, ovaries, and liver, followed by the kidneys, blood, eyes, gills, and panels, with the meat of the pufferfish containing less toxin. Tetrodotoxin is one of the most toxic non-protein poisons found in nature, with a toxicity equivalent to 1,250 times that of sodium cyanide, and one puffer fish roe is toxic enough to kill dozens of people. The toxin usually causes nerve paralysis, vomiting, and then cardiac and respiratory arrest.
Additionally, when slaughtering puffer fish, if you accidentally stab your finger with a small thorn near the fish's mouth, it can also cause poisoning. Moreover, the degree of toxicity of puffer fish is related to the season and the reproductive cycle of puffer fish, and the toxicity of puffer fish is greatest in late spring and early summer, so it is recommended that the public must not eat at this time.
Nutritional value of puffer fish
1, puffer fish taste sweet, warm. It is toxic. It can remove wind and dampness, replenish the spleen and benefit dampness.
2. Puffer fish meat contains protein, fat, vitamin A, B1, B2 and niacin, calcium, phosphorus, iron, and its toxic substances tetrodotoxin, tetrodotoxin and tetrodonic acid.
3. There are many kinds of puffer fish, most of them are poisonous, and their toxicity is not equal. In terms of tissues and organs, the toxin of ovary and liver is the most, followed by spleen, intestines and panels, and the meat is almost non-toxic, even if the most toxic puffer fish, the toxin contained in its meat is also very little. Tetrodotoxin has an analgesic effect.
Season to eat puffer fish
Spring ~~ Spring puffer fish is the most fat and delicious ~~ "Peach blossoms outside the bamboo, three or two branches, the spring river water is warm and the ducks know first. Piper artemisia is full of reed buds, it's the time for blowfish to go up." This poem above is the evidence ~~~ ancient people began to know how to eat ~~ the greatness of our country ~~~~ but ~~ spring is the most fertile time of the puffer fish, but also the strongest season of tetrodotoxin.