Catfish is indeed an omnivore. Its main foods include aquatic insects, organic debris, etc. It also eats live animals such as animal droppings, small fish and rats. However, in aquaculture, animal manure is a cheap and non-toxic natural fertilizer, so long as it is treated properly, there is no problem. In other parts of the country, information about feeding catfish with swill or animal carcasses and viscera has been found many times. Catfish themselves love to eat this rotten thing, and most of the artificially cultured catfish grew up in this environment.

Catfish are tenacious and can survive in very dirty environments, such as urban sewers. Some people say that catfish is dirty because of its internal organs. Since it can survive in human excrement, some fish farmers deliberately feed them with human or pig excrement. Living in a harsh environment for a long time, catfish are prone to accumulate toxic substances, such as heavy metals, which cannot be eliminated no matter how high-temperature cooking.

As an economical and environment-friendly natural fertilizer, manure is widely used in aquaculture besides planting organic vegetables, which provides a lot of nutrition for plankton in water. Because there are a lot of parasites and pathogenic bacteria in feces, it can't be directly poured into the pond for use. Before use, it needs to be fermented to kill parasites and pathogenic bacteria, and decompose macromolecular proteins in feces into small molecular proteins and nutrients that can be easily utilized. Fermented feces will not be fermented in the pond for the second time, and it also avoids the fish's anoxic gas caused by excessive consumption of dissolved oxygen in water during the decomposition of organic matter. It is not worth the loss to discharge feces directly into the pond, which may easily lead to fish's anoxia, illness and even death. There are many catfish with their mouths wide open in the article in the rumor. The reason why they are exposed to the water is that they lack oxygen in fecal water and need to swallow air to supplement oxygen, not eating shit. ...

We can't deny the innocence of all catfish just because of a bad situation. No matter how great the catfish is, its fighting power is limited. If you let it live in the water polluted by all kinds of pathogenic bacteria (rumoured excrement and garbage), it will get sick, and once it gets sick, it will easily die. Farmers are not stupid. Who raises fish to raise the fish to die ~ ~ Although catfish also lives by eating corrosion, there are still ... eels, hairy crabs, crayfish and so on, so you don't have to be particularly nervous, as long as the production process.

However, as an omnivore, catfish still eat meat, which is higher in the food chain, and it is indeed easier to enrich some harmful substances. This is a problem existing in all large animals, which is also the inevitable result of the food chain. The good news is that according to the current data, most of the catfish sold in the market are farmed fish, and there are basically no toxic and harmful substances such as heavy metals and pesticide residues that exceed the standard, so they can still be safely eaten. However, the supervision of farmed fish cannot be relaxed, and in addition, the management of industrial sewage discharge should be strengthened.