Why you shouldn't eat alien catfish

[Silurus]

Ernawati, Y, 2014. The analysis of the concentration of heavy metals cadmium, mercury and lead in the flesh of suckermouth catfish (Pterygoplichthys pardalis) in Ciliwung River, Indonesia. AACL Bioflux 7: 33-42.

[Shane]

I wish the author had compared concentrations of heavy metals in several frequently consumed fishes found in the river. It is no surprise that loricariids from a polluted river have high concentrations of heavy metals, but do they have higher levels than other frequently eaten fish in the same river? The conclusion is not to eat loricariids from the Ciliwung, but it may also be true that it is not safe to eat any fishes from the river.
-Shane

[racoll]

Recently they banned sale of

Piracatinga

in Amazonas, partly due to concerns about mercury poisoning, and also because to catch them, fishermen kill river dolphins as bait.

It was stated that because they scavenge,

Piracatinga

have high mercury levels, but as Shane says, I hope this was based on actual comparative data, rather than just an assumption. Why would, say, a long-lived "top predator" like

Piraiba

not have similar levels? Hardly reassuring.

[Durlänger]

If you look at pics from the Ciliwung, it`s hard to believe fish can live in that dump well upstream maybe.

Yes, instead of control goldwashing, were the mercury comes from, just forbid poor people, which cannot read, eating this or that fish, that will surely work