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Nine Types of Fish You Should Avoid Eating

May 27, 2017

Fish is delicious and healthy, but there are certain types of fish that will do you more harm than good. Below you will find 9 kinds of fish that you should only eat on the odd occasion, or not at all.

Imported Catfish

CatConsumption: Not recommended

Catfish can grow to quite a considerable size. However, to accelerate their growth, many fish farmers feed them growth hormones, especially those from Asian countries. Free-grown catfish are a lot less dangerous and have more nutritional value.


MackerelConsumption: Adults 200g, children 100g per month

Mackerel contains mercury, which is a disease-causing chemical that the human body cannot eliminate. The Atlantic mackerel is the least dangerous in this regard, and you’re safe to eat as much of this as you like.


TunaConsumption: Adults 100g per month, not recommended for children

Tuna has a lot of mercury, especially blackfin and bluefin tuna. Furthermore, there’s precious little free-grown tuna in stores as it is near extinction in the wild. All the tuna you will find comes from farms where it has been fed antibiotics and hormones.


TilapiaConsumption: Not recommended for those with heart disease, asthma, or arthritis

There aren’t many healthy fatty acids in tilapia, yet its concentration of unhealthy fats is almost as high as in lard. Excess consumption of this fish leads to an increase in cholesterol levels and makes the body more prone to allergens.


EelConsumption: Adults 300g, children 200g per month

Eels contain a lot of fat and, as a result, they easily absorb any industrial and farm waste that is in the water they live in. American species of eel have the highest levels of such toxicity. Furthermore, European eels are well known for being contaminated with large amounts of mercury.


PangasiusConsumption: Not Recommended

Most of the pangasius that we can buy in our stores come from Vietnam, namely from the Mekong River – one of the most contaminated bodies of water in the world. Moreover, this fish contains an elevated level of nitrofurazone and polyphosphates, which are known carcinogens.


TilefishConsumption: Men 100g per month, not recommended for women and children

This fish contains more mercury than any other fish, and it is often caught in breach of health and safety rules, leading to an increase risk of food poisoning.

Sea Bass

Sea BassConsumption: Adults 200g, children 100g per month

Sea bass also contains a lot of mercury. Furthermore, if you order this somewhere as a filet, there is a very high chance that you will be given pangasius or some other cheaper fish.


DollarfishConsumption: Not recommended for those with digestive issues

This fish, sometimes called the oilfish, contains gempylotoxin – a waxy substance that cannot be digested at all. The substance doesn’t do much harm, but it can lead to indigestion. To reduce the levels of gempylotoxin, it is best to fry or grill this fish.

How to Choose Fish

• Fresh fish will have shiny scales and eyes, so if a fish has dry fins and gray gills, it is not fresh. If the tail is limp, that is also an indicator that the fish is not fresh.

• When buying live fish from a tank, make sure the water is clear. Choose the fish that are closer to the bottom.

• When buying salmon, choose the chunks with white threads in them – if a chunk is completely red, it has probably been dyed.

Source: brightside

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