Is it true that the Prophet SAW forbade eating scaleless fish such as catfish?

Summary

The narration claiming a prohibition on scaleless fish comes from a Shia source, the book Usul min al-Kafi, and is not accepted in the Ahl al-Sunnah wa al-Jamaah methodology. No reputable hadith scholar is found to have narrated it, so it cannot be used as evidence for rulings. All kinds of fish are lawful to eat despite differences in form, including fish without scales. Muslims are advised to refer to authentic sources and avoid spreading viral claims that are unverified.

Written in our own words from the original fatwa — check the source before acting on it.