There are many kinds of fish that contain toxins. They live in fresh water or seawater. There are both bony fish and cartilaginous fish. According to the types of fish poisons, the following are common:
1. Fish containing neurotoxins, such as the well-known puffer fish, contain highly toxic substances that damage nerve tissue in its ovary, liver, blood and kidney. Only half a milligram of tetrodotoxin can kill people.
2. Fish with blood poison This fish contains fish blood toxin in its blood. Monopterus albus and eels living in rivers contain blood poison. Blood poison can be ineffective after high temperature treatment. However, human beings like to eat the blood of Monopterus albus raw, saying that it has nourishing effect, and sometimes it can cause poison to the stomach.
3. Fish with Oviduct Poison mainly contains some fishes of Schizothorax subfamily. Mature fish eggs are the most toxic. The poison is globin protein. It is still toxic after high temperature treatment. People will be poisoned if they eat100-200 grams of fish eggs. But meat is nontoxic.
4. Bighead carp, bighead carp (bighead carp), silver carp (bighead carp) and carp have the strongest bile toxicity. It often causes human poisoning. Bile poison mainly damages kidney, liver, heart and brain. Some people mistakenly believe that fish gall can be treated and swallowed, and in severe cases, death can occur.
5. Fish with too much histamine acid can also cause human poisoning. Most of these fish have blue skin and red meat. Such as mackerel, mackerel, mackerel and golden thread fish. When the histamine acid existing in these fish is decomposed under suitable conditions, it can produce a large amount of histamine and a substance called saury toxin, which makes people poisoned.
As for the problem of identifying toxic fish products, it is complicated, especially when the toxic fish is processed into preserved fish, fish meal, or other semi-finished products and finished products, because the original fish is unrecognizable, at this time, these products can only be tested in the laboratory to determine whether they contain toxins.