Catfish have become the main ingredient in many fish hotpot restaurants in Haikou. While many locals favor fish hotpot, few realize the ingredients are often low-grade fish.Hidden within Haikou's bustling downtown lie multiple fish ponds. Their surroundings are littered with pig farms, poultry slaughterhouses, and scrap collection stations. They share a wall with large hospital waste pits. The pond surfaces float with mountains of household trash, dead fish, and dead chickens... Every day, thousands of pounds of garbage fish are scooped from here and sent to Haikou's markets.
Are these catfish clean? Are they safe to eat? Let's take a closer look.
Are catfish clean? Can unclean catfish be consumed?
According to reports, the whiskered catfish is also known as horned catfish, dark-spined catfish, pond lice fish, or whiskered catfish.Data indicates catfish possess tender flesh with certain medicinal value, regarded as a nourishing food. Combined with their rapid growth, strong disease resistance, high yield, and significant economic returns, they are highly valued. Due to their tender texture, delicious flavor, and low cost, catfish have become the primary ingredient in fish hotpot restaurants scattered throughout Haikou's streets.
Catfish feed on decaying flesh and possess exceptional survival capabilities, tolerating low-oxygen conditions. They can thrive in water bodies where most fish cannot survive.
Water saturated with decaying matter inevitably contains large amounts of harmful substances like pathogens and toxins, which accumulate within the catfish's body.While high-temperature cooking can eliminate viruses and bacteria, toxins remain within the catfish. How much toxin persists and what effects it may have on humans is difficult to determine, as no laboratory testing has been conducted on this matter. Therefore, before consuming catfish, it should be kept in clean water for a period to allow it to expel accumulated contaminants.
Some experts suggest that fish exhibiting exceptional survival capabilities in polluted waters likely possess high tolerance for toxins, accumulating significant amounts. Conversely, fish poorly adapted to such environments die from even minor toxin exposure, preventing substantial accumulation of harmful substances.
Is it safe to eat unclean catfish?Fish raised on swill or animal offal are difficult for ordinary people to identify visually. However, if cooked fish has an unusual odor, it is likely contaminated and should never be consumed.
Beware of Mercury Poisoning When Feeding Catfish to Babies
Catfish are carnivorous fish with longer lifecycles, and their mercury content tends to be higher than that of other fish.
Global water pollution severely threatens fish habitats. Toxins ingested by small fish accumulate in their bodies, then transfer to larger predators through the food chain. Consequently, larger fish—especially carnivorous species—suffer the most severe contamination, with heavy metal levels often increasing exponentially, particularly mercury.
Babies have poor detoxification abilities and underdeveloped livers. Long-term consumption of such fish may cause their internal mercury levels to exceed safe limits, as even low mercury exposure can impair normal childhood development. Therefore, avoid feeding babies predatory fish unless they are truly uncontaminated deep-sea varieties. Mothers should also minimize predatory fish consumption during pregnancy and breastfeeding.
What distinguishes catfish from snakehead fish?
Most chefs know how catfish are farmed, and upscale restaurants rarely use them as ingredients. However, due to their low cost, some eateries pass off catfish as snakehead meat for sale.
Black fish, also known as snakehead, snake-skinned fish, piranha, firehead, or moneyfish, has many names. It has a long, round body, a large mouth with sharp teeth, and a fierce temperament. Its dark, snake-like pattern features black and white stripes, and it has a pair of protruding, luminous eyes. Due to variations in water color across regions, the black fish's body color may differ slightly.Black fish meat is coarse and not particularly palatable, yet highly nutritious. Consuming it is also believed to reduce inflammation in wounds.
Catfish typically lack scales, possess a flattened head and large mouth, and have several long whiskers around the mouth used for detecting taste—a defining characteristic.