CATDOLL : CATDOLL: Snakehead carp is a ferocious carnivorous fish with few natural enemies in freshwater areas. Why are there so few of them?

Snakehead carp is a ferocious carnivorous fish with few natural enemies in freshwater areas. Why are there so few of them?

Snakehead carp is one of the most ferocious fish in freshwater. In the wild, except for the giant salamander, no fish is its opponent. However, such a ferocious fish has the title of "filial fish" in some parts of China. Why? Let's discuss this issue briefly. Speaking of alien invasive species, in China, there are many things that invade other countries in rural areas, such as grass carp, carp, longevity fish, etc. It can be said to be rampant abroad. So far, there is no natural enemy, but there is another species that invades the United States. China regards it as a natural enemy, but the Chinese regard it as a top-grade product.

It has been around for more than 2,000 years. Why? What is the reason? Snakehead fish is also called "grouper" here. This fish should be at the top of the food chain of freshwater fish, and it is basically "invincible" in the reservoir. The meat of snakehead fish is white and tender, especially elastic and tough, and the biggest advantage of snakehead fish is that it has no bones. The fish fillets made of it are crystal clear, and there is no earthy smell of freshwater fish. Snakehead fish is my favorite fish among freshwater fish. The reason why snakehead fish is called filial fish is because it is given as a gift.

In some areas of our country, when the elderly have birthdays, young students usually send black fish to celebrate their birthdays. This is because fish is like "surplus", symbolizing good luck and surplus every year. Although sending ordinary fish can also express this meaning, black fish is rarer than other fish after all, and black fish itself is delicious, it is "the best fish", so the price is also more expensive. Therefore, black fish has become the first choice for birthday celebrations in some places. In fact, this invasive species is "black fish", also known as raw fish, thunder fish, black fish, black snakehead, etc.

It is basically distributed throughout the country. It is a freshwater fish that lives in aquatic plants and muddy bottoms all year round, and exists in rural ponds, streams, and rivers. And the reproduction speed is amazing, as fast as carp. It can produce 10,000-30,000 eggs at a time, and it can fill the entire pond in just a few months. Abroad, the invasion of this fish is a headache for foreigners. Once, the species that was killed when it was notified to foreigners could not be killed faster than its reproduction rate, and ended in failure, but now it is rampant. The source of black fish in reservoirs Many reservoirs have underground springs, and there are black fish fry in the underground river, which will enter the reservoir with the water flow of the underground river. When it rains heavily or enters the reservoir, it enters the reservoir with the water flow.

Because snakehead fish have certain requirements for the environment, they like water bodies with dense aquatic plants, which has certain requirements for the water quality of the water body, and snakehead fish especially like water bodies with slow currents, which is related to their need to build nests on the water surface when breeding. Once the water quality is slightly worse or the water flow is faster, it is difficult for them to survive there.

The main reason is that black carp has relatively high requirements for the environment, and black carp is basically only distributed in my country.

How to raise black fish fry and what to eat

Snakehead fry are fed with goldfish worms or water earthworms. The amount of food they eat is closely related to the water temperature. When the water temperature is high in summer, the snakehead will eat a lot. When the water temperature is below 12℃, they will stop eating. They are ferocious, bottom-dwelling, carnivorous fish, and like to live in shallow waters with lush aquatic plants. Snakehead meat is delicious and nutritious, and is deeply loved by consumers. It is a fish with high economic value.

Additional information

Artificial breeding

Artificial seedling cultivation

1. Parent fish cultivation: Before winter, we purchased wild and artificially cultivated snakehead fish weighing more than 1,000 grams from the reservoir as broodstock and put them into the greenhouse pond for cultivation. 600 groups of broodstock, with a male-female ratio of 1:1. At the same time, we stocked 100 kg of silver carp with a size of 13.2 to 19.8 cm as bait for snakehead fish. The greenhouse area is 300 square meters, and the water depth is maintained at 0.6 to 1 meter.

2. Artificial induction of spawning: From May 11 to 29, 514 groups of mature broodstock were selected in 7 batches, with an average tail weight of 1.6 kg. Male and female fish were paired at a ratio of 1:1, and one group was placed in each spawning box. Chorionic membrane, ovulation induction No. 2 and dioxin were used as oxytocin.

The medicine is prepared according to the weight of each group of fish and injected tail by tail, using two injections, 14 to 24 hours apart. After the injection of the breeding fish, the surrounding environment needs to be quiet and covered with a cover, and the water temperature is 23 to 25 degrees Celsius, for about 30 hours.

The breeding fish begin to lay eggs one after another. The eggs cannot be moved immediately after laying eggs. The breeding fish's habit of protecting eggs can be used to increase the hatching rate of the eggs. After 1 to 2 days, the normally developed fertilized eggs are picked up and put into the hatching pond for incubation and cultivation.

3. Bait cultivation: Use earthen ponds to cultivate natural bait, with an area of ​​2 to 4 mu, preferably more than two ponds, and apply fertilizer paste, photosynthetic bacteria and other fertilizers. The peak breeding period of zooplankton should be consistent with the time when the fry start to feed. It can be judged from the water color and transparency. When the water color turns lighter, grayish white, or the transparency increases, it is the best time to catch zooplankton.

Nutritional Value

protein

Snakehead carp is rich in nutrition and protein. Its muscles contain 17.63% crude protein (higher than the four major freshwater fish in my country). The amino acid content in its muscles accounts for 77.07% of the total, of which the total amount of 7 essential amino acids for the human body accounts for 29.73%.

The content of four umami amino acids (aspartic acid, glutamic acid, alanine, glycine) is 31.01%, which may be the reason why black snakehead tastes delicious.

The crude protein content in the muscle of black snakehead is 17.63% (male) and 18.89% (female). It contains 18 kinds of amino acids, including 8 essential amino acids for the human body and high content of flavor amino acids, which was discovered using the amino acid evaluation model.

The essential amino acid composition of each part of male and female Channa argus is relatively complete, with male muscle scoring 53 points and female muscle scoring 50 points. The protein content in Channa argus muscle (16.94%) is higher than that in mandarin fish, grass carp, silver carp, bighead carp, Chinese soft-shelled turtle, hairtail, prawn and egg.

Fat

Snakehead fish is a low-fat food with delicious meat, which is favored by many consumers and is particularly suitable for nourishing and conditioning. Current research has found that the fat content in snakehead fish is relatively low, and the influence of feed nutritional level on the mass growth rate of snakehead fish in aquaculture is as follows: protein> inorganic salt> carbohydrate> fat, with fat being the lowest.

Reference source: Baidu Encyclopedia - Blackfish