If you go to the market and see these types of fish, you should stay away and not eat them often, otherwise you will easily bring toxins into your body and cause dangerous diseases.

Large sweet fish size

Many people often think that big fish means delicious and nutritious, so they often do not hesitate to buy big fish to eat. But the reality is that most freshwater fish are usually not too big, only weighing about 1.5-2kg, requiring many years of raising and caring. However, there are also larger fish, from 4-7kg, for sale.

This type of fish should be avoided as it may have been injected with growth hormones or have lived in muddy areas for a long time, which has a higher risk of accumulating pollutants.

In particular, to get fish to such a large weight, farmers often have to feed them with a lot of growth stimulants for a long time. Therefore, eating this type of fish may not only be innutritious but can also introduce dangerous toxins into the body.

Fish with big belly

When you go to the market to buy fish and see that the fish is no longer moving, but the belly is very swollen, the fish may have died a long time ago and the inside is rotten, creating gas that causes the belly to swell. According to food experts, when fish die, the immune system is weakened and bacteria are free to grow. The process of decomposing fish creates organic acids that cause bad odors and change the color and composition of histidine protein.

Furthermore, fish that have been dead for a long time will decompose their flesh and produce toxins. Consuming these fish can cause acute poisoning such as digestive disorders, bloating, indigestion, abdominal pain, diarrhea, etc. For a long time, chemicals from dead fish can cause chronic diseases that destroy the liver, kidneys, lungs and nervous system.

Tuna

This fish contains high levels of mercury, although it is common, it should be consumed in moderation to avoid the risk of poisoning that can affect your health. Be careful when consuming tuna to avoid health risks.

Catfish/snakehead fish

Vietnam is a country with a lot of catfish and even exports them abroad. However, after testing in the US for mercury and Malachite green, the results were all positive. In the US, catfish from Vietnam are often considered to be dirty fish and should be avoided.

Puffer fish

Puffer fish is a fish that is potentially toxic to human health. When consumed, it not only contains mercury but also causes dangerous poisoning. For this reason, puffer fish should not be eaten. In particular, pregnant women should not come into contact with this type of fish. In addition, puffer fish contains toxins such as tetradotoxin in the ovaries and hepatoxin in the liver, which are toxins that can be life-threatening if not prepared properly.

Swordfish

Swordfish, a type of marine fish, is high in mercury. Eating swordfish can lead to the risk of methylmercury poisoning. Therefore, it is advisable to limit the consumption of this fish to avoid the risk of adverse health effects.

Farmed salmon

While wild salmon typically eat organisms in their watery environment, farmed salmon are often fed high-fat, industrial feeds to increase their size. However, this results in farmed salmon that is high in calories and saturated fat, but low in minerals.

The ratio of omega-3 to omega-6 is also lower. Additionally, if salmon farms do not comply with hygiene, salmon can be contaminated with toxins such as dioxins and PCBs.