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Mycotoxins, the neglected threat in fish farming! Even carnivorous fish are hard to avoid

May 26, 2023

In recent years, with the rising prices of fishmeal and fish oil, plant-based protein sources have become more and more widely used in aquafeeds. Even for the compound feed of carnivorous fish, plant raw materials can account for 50% to 70%. As the current feed production tends to use cheap plant-based protein raw materials instead of high-priced animal-derived protein raw materials such as fishmeal, this will inevitably increase the hazards of mycotoxin contamination. With the widespread use of plant-based raw materials, the pollution of mycotoxins to feed raw materials and their finished products has become increasingly prominent.

The hazards caused by mycotoxins to aquatic products are

1. Cause poisoning

The ingestion of feed contaminated by mycotoxins by aquatic animals can lead to acute or chronic poisoning. Acute poisoning will cause symptoms of digestive system disorders, and even death in severe cases; the symptoms of chronic poisoning are various, and the hazards of different toxins vary greatly.

2. Liver poisoning

Long-term consumption of feed containing mycotoxins will lead to stunted organ development and changes in physiological functions of aquatic animals, and in severe cases, tumors or cancers will occur. And it can cause the content of alanine aminotransferase and aspartate aminotransferase in the fish body to increase, indicating that the liver function of the fish body is damaged. The most damaging mycotoxin to the liver is aflatoxin, so aflatoxin is also called liver toxin.

3. Suppresses immunity

Evidence suggests that ingestion of mycotoxin-contaminated feed in animals suppresses the immune system and reduces disease resistance, even at low or moderate levels of contamination. Mycotoxins that impair the immune system include aflatoxin B1, T-2 toxin, ochratoxin, deoxynivalenol and fumonisins (also known as fumonisins). Most of these toxins damage the immune system by inhibiting the synthesis of key proteins related to immune function.

Although the presence of mycotoxins in feed is an increasingly serious threat to aquaculture production, feed mills and farmers still have a variety of options to prevent or reduce the risk of mycotoxins.

What measures can reduce mycotoxins?

1. Cut off the source of mycotoxins

Control mold growth conditions and inhibit toxin production. Control is carried out from the links of procurement, production, storage and transportation respectively. Source of raw material for each batch of feed. Each batch of protein and energy raw materials is tested for mycotoxins, and raw materials that exceed the control standards are strictly returned.

2. Carefully select raw materials, maintain good feed and raw material storage conditions, and select effective mycotoxin detoxification agent products to solve the different mycotoxins as comprehensively as possible.

3. You can add bile acids that protect the liver and gallbladder when feeding the feed

Bile acids can promote the detoxification and detoxification of the liver, stimulate the liver to secrete bile, and excrete toxins and mycotoxins in the body along with the bile through the enterohepatic circulation, restore liver health and enhance liver function; they can also repair intestinal mucosal damage and restore Intestinal mucosal injury, restore the compact structure of mucosal epithelial cells, enhance the mechanical barrier function of the mucosa, inhibit the reproduction of intestinal harmful bacteria, and maintain the intestinal microecological balance.

The harm of mycotoxins to aquaculture is obvious. Every farmer should actively adopt various methods to reduce the impact of mycotoxins on aquatic animals, reduce production costs, reduce damage, improve breeding efficiency, and jointly maintain healthy water. product.

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