Fish is often praised as one of the healthiest protein sources, but not all fish sold in markets is safe. Food-safety experts warn that certain low-quality, poorly handled, or contaminated fish may carry significant health risks—especially when the price seems “too cheap to be true.” While fish itself is nutritious, the danger lies in where it comes from, how it is raised, and how it is stored.

Here are six types of fish that experts advise avoiding if you cannot verify their origin, hygiene, or handling conditions:

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1. Fish with Strange Odors or Slimy Texture

If a fish smells sour, overly fishy, or has a sticky surface, it may already be spoiled. Such fish can harbor dangerous bacteria that cause food poisoning.

2. Fish From Polluted or Unknown Water Sources

Bottom-feeding species caught in polluted lakes, canals, or industrial zones may accumulate toxins, heavy metals, and chemical residues that pose long-term health risks.

3. Cheap Farmed Fish Raised in Overcrowded Conditions

Fish grown in cramped, dirty ponds are often exposed to parasites and may be treated with excessive antibiotics—something experts warn against overconsuming.

4. Fish With Visible Parasites or Unnatural Spots

Dark patches, cysts, or worms on the flesh or skin indicate poor-quality farming or contamination. These should always be avoided.

5. Repeatedly Thawed and Refrozen Fish

Once frozen fish is thawed, it must be cooked. Refreezing increases bacterial growth and degrades quality, making it risky to eat.

6. Fish Sold at Suspiciously Low Prices

When vendors sell fish far below market value, it often means the fish is old, damaged, or sourced from questionable suppliers. Low price rarely equals safety.

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Why Doctors Are Concerned

Doctors and food safety experts note that contaminated or spoiled fish can cause:

• Severe digestive infections

• Parasite exposure

• Heavy metal accumulation over time

• Inflammation from antibiotic residues

They stress that the species itself isn’t the problem—the issue is poor farming, dirty environments, and unsafe storage practices.

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How to Choose Safe Fish

To protect your family’s health, experts recommend:

• Buying from reputable, clean markets

• Choosing fish with clear eyes, firm flesh, and a fresh smell

• Avoiding fish that looks too cheap or too perfect

• Asking sellers about origin and delivery dates

Good-quality fish remains one of the most nutritious foods you can eat—but only when it’s sourced safely.