The internal organs of the brocade fish are black when they die, and what is the reason for the fest

The black thing in the internal organs of the fish is the black membrane of the encapsulated internal organs of the fish, the scientific name is "the visceral layer of the inner membrane", when we make fish, we usually scrape the black membrane in the belly of the fish, it is said that this black membrane is a toxic contaminant, and the fishy smell is heavy. In fact, this black film itself is not toxic. It is found between the abdominal wall and the internal organs of the fish and plays a role in lubricating and protecting the internal organs.

Because the membrane of the fish is differentiated from its "gonad" tissue, and the fat content of the membrane is high, it has a strange fishy smell. Some people believe that this membrane has the effect of filtering pollutants and is therefore "very toxic". In fact, it is not the function of this membrane to "filter poisons", but due to its high proportion of fat content, when pollutants such as heavy metals and pesticides enter the fish, they will be concentrated in the adipose tissue, so that the membrane and the adipose tissue of the fish body are polluted together.

It is a mistake to judge the degree of contamination of the inner membrane by the depth of its color. The "dirty" in the "visceral layer of the inner membrane" should be read as the four sounds of "zang", which refers to the internal organs, not the dirty organs. The color of the inner membrane is determined by its melanin content.

Therefore, there is no basis for the claim that the black film is a toxic contaminant. However, it is the fishiest and most earthy part of the fish, containing a large amount of histamine, lipids, lysozyme and other substances, which can cause nausea, vomiting, abdominal pain and other symptoms after eating. In addition, this black film is also a collection place for various harmful substances, and it is easy to be polluted by pesticides, hormones, pollutants in water quality, etc., so it is best to wash the black things in the internal organs of the hairtail and not eat it.

No, if you encounter such a situation, you should never eat it.

The ulceration on the fish is caused by bacteria, and there are several ways to choose from.

1) Salt: Add kilograms of salt per 50 kg of water and soak for 5 minutes.

2) Potassium permanganate: 20ppm immersion for 10-15 minutes.

3) Furazolidone: gram per cubic meter of water, soaked for 1-2 hours.

Applying drugs: 1) Tetracycline or chlortetracycline anti-inflammatory ointment is applied to the affected part of the fish.

2) Furacillin or furazolidone is mixed with petroleum jelly and applied to the affected part of the fish.

One condition is poisoning, which causes the surface of the fish to turn black, and it is difficult for novices to save it.

The other is that the sudden change of the environment, the sudden change of water quality and temperature will also cause the fish body to turn black, this situation is more likely to occur during the transportation transaction, go home to recuperate, good physique can gradually stabilize, restore the original color.

I judge that the probability of your second type is higher, the water you use to raise new fish is definitely not good, and the tap water should be empty for at least 34 days, waiting for the chlorine in it to decompose. And when the new fish enters the tank, it must take time to 'cross the water'. And goldfish consume high oxygen, and the density should not be too large.

A proper filtration system is also a must. Don't be in a hurry to feed the fish you just bought home, it is easy to cause gastroenteritis, at least 2 days later, rest assured that the goldfish will not starve to death.

It's better to learn the most basic knowledge before buying fish, so that it will be good for you and fish, thank you.