Doctors Warn: These 6 Types Of Fish Should Never Be Bought — No Matter How Cheap They Are

Fish is considered one of the healthiest foods, but doctors and food safety experts warn that some types of fish sold in markets may carry serious health risks if consumers are not careful.

According to specialists, these are the fish people should avoid buying whenever possible:

1. Dead Fish With Cloudy Eyes And Pale Gills

Experts say fresh fish should have:

• clear eyes,
• bright red gills,
• and firm flesh.

Fish with cloudy eyes, gray gills, strong odors, or soft meat may already be spoiled and contain dangerous bacteria.

2. Fish Frozen And Thawed Repeatedly

Some sellers repeatedly refreeze fish to make old seafood appear fresh again.

Doctors warn that repeated freezing and thawing can rapidly increase bacterial growth while also damaging the fish’s quality and safety.

3. Fish From Polluted Rivers Or Lakes

Fish raised in contaminated water may absorb:

• heavy metals,
• industrial chemicals,
• parasites,
• and harmful toxins.

Long-term consumption may negatively affect the liver, kidneys, and nervous system.

4. Fish With Unusually Bright Or Strange Colors

Experts warn that some fish may be treated with chemicals or preservatives to make them look fresher than they actually are.

If the fish appears unnaturally shiny, overly bright red, or has a chemical smell, consumers should be cautious.

5. Large Predatory Fish High In Mercury

Certain large fish naturally accumulate high mercury levels over time.

Examples often mentioned by health experts include:

• shark,
• swordfish,
• king mackerel,
• and some types of tuna.

Pregnant women and young children are usually advised to limit consumption of these fish.

6. Fish Sold Extremely Cheap Without Clear Origin

Doctors say consumers should be very careful with suspiciously cheap fish sold without:

• proper storage,
• labels,
• or origin information.

In some cases, the fish may already be old, improperly stored, or chemically preserved before sale.

Food safety specialists emphasize that fish itself is not dangerous when sourced and prepared properly. The real risk comes from poor storage, contamination, polluted environments, and unsafe selling practices.

Experts recommend buying seafood from trusted sellers, checking freshness carefully, and cooking fish thoroughly before eating to reduce health risks.