Popular Indonesian Fish Absorbs Toxins from Water

Catfish is one of the most popular fish in Indonesia. Delicious, nutrient-rich, and easy to prepare, catfish has a long history worldwide. There are more than 2,000 catfish species found on every continent except Antarctica.

According to Seafood Watch, catfish has a healthy fat profile. Its saturated fat content is low (approximately 1 gram per serving, depending on the species) whilst being an abundant source of omega-3 fatty acids DHA and EPA (up to 300 milligrammes per serving). This means the fish also helps support heart health and brain function.

However, research shows that catfish (Clarias sp. and other catfish species) are capable of accumulating various pollutants such as heavy metals and persistent organic pollutants through water absorption, contaminated food sources, and industrial waste, which can then accumulate in the fish’s tissue.

Catfish can accumulate pollutants such as PCBs, pesticides, and heavy metals (mercury, lead, cadmium) from contaminated water and sediment, according to research published in Environmental Research. Wild catfish from polluted rivers carry higher risks than catfish from cleaner waters.

A study of the Paraopeba River in Brazil reported that heavy metals such as mercury, cadmium, chromium, lead, and zinc accumulated in catfish tissue. Heavy metal content is often higher in internal organs, indicating potential health risks if consumed continuously.

To avoid concern when consuming catfish, select fish farmed in clean and well-maintained ponds. Health risks associated with catfish generally stem from exposure to environmental pollutants rather than the fish itself.