Don't know bout the mystus. Don't think that's nemurus. Eyes look like the wrong place from that shot. I'd have to find the PDF I have of their taxonomic descriptions again to help. So I'll look into it
Agree with the genus assignments. Can't help with species ID. Way too many in each genus. Especially Mystus.
As for Hemibagrus, I'd advise to ask Silurus on Planet Catfish. I am sure he will ask where it was caught. He is the ichthyologist who revised the Hemibagrus genus last with 32 species.