Why is it bad to eat scavenger foods such as catfish?

It is a misconception that all catfish are scavengers. Catfish comprise over 3,000 different species, out of which 99% consume zooplankton, insects, algae, and fish, depending on size, species, availability, and habitat. Many prefer live prey when given the choice.

Scavengers play a vital role in ecosystems by cleaning up organic waste, thereby benefiting the environment.