Under certain conditions of temperature and humidity, many molds can multiply in feedstuffs or finished feeds to produce some mycotoxins with carcinogenic, cytotoxic or neurotoxic effects. Among them, aflatoxins are more widespread and more toxic. . Aflatoxin can cause damage to the liver and kidney of carp, and it has carcinogenic and lethal effects. However, there has been no report about the semi-lethal dose (LD50) of carp. Due to the high price of squid, tenants are generally not fed feeds that have become moldy. However, in the feed mill, it should be noted that the raw materials used should not be contaminated by Aspergillus flavus. Pesticides, polychlorinated biphenyls, crude oil, and hydrocarbons are caused by pesticide residues in farmland, sewage discharged from chemical plants, and leaks from oil refineries. These substances are highly toxic to catfish and can cause hepatomegaly and developmental abnormalities. Carcinogenic, lethal effect. Among them, organic phosphorus and organochlorine pesticides can destroy the normal physiological function of the nervous system of the squid, inhibit the transmission of nerve energy and block the transport of ions. Although organophosphate pesticides have no obvious organophosphorus pesticide toxicity, they are more stable than organophosphorus pesticides and can accumulate in salmon, causing serious problems. Foldable Stretcher,Folding Stretcher,Emergency Folding Stretcher,Foldable Ambulance Stretcher jiangyin chenyi medical technology co.,ltd , https://www.chenyimed.com
Heavy metals mainly refer to mercury, lead, zinc, cadmium, nickel, etc. Heavy metals have two kinds of external poisons and internal poisons. The external poisons are combined with protein produced by earthworms and body surface and form a protein complex, covering the whole body and body. The table is full of septal crevices, making it difficult for the normal movement of the cocoon and the codfish to suffocate. The endotoxin is the heavy metal ion entering the cod in the cockroach and body surface and binding to the sulfhydryl group in the catalytic active site of the main enzyme in the body. Insoluble sulfate, thereby inhibiting the enzyme activity, impede the body's metabolism, causing the death of carp.
Therefore, we must pay attention to the analysis of water quality when choosing water for raising turtles, and try to choose uncontaminated water sources. At the same time, we must protect the water environment and strengthen the environmental awareness of the entire people.
The main raw material of salmon feed -- fishmeal will undergo protein decomposition during transport and storage, resulting in a series of toxins such as histamine, putrescine, cadaverine, tyramine, propylpropanol, etc., which are very harmful to fish. Histamine is currently the most studied and histamine is a decomposition product of histidine. It is histidine that is decomposed by the action of histamine dehydrogenase in the presence of Proteus vulgaris, Acinetobacter histamine, and other bacteria. An amine formed after the hydroxyl group, the carp will cause poisoning after ingesting a certain amount of histamine. Therefore, the freshness of fishmeal is very important for the quality of carp feed and the growth of catfish. The histamine content and volatile base nitrogen (VBN) can be used as a measure of fishmeal freshness. The quality of fish meal is generally good. Concentration 100mg/dm3, VBN<600.00001m/m.