The victims are Md Shafiqul Islam, 32, from Satkhira; and Md Alam, 48, from Barisal.
The muggers, who were pretending to be co-passengers, snatched Tk26,000 and Tk29,000 from them when the bus reached the Sonargaon Janapath intersection in the Sayedabad area.
The fishermen were going to the Jatrabari wholesale fish market from Gulistan at around 5am, just like every other day. The muggers stabbed them for refusing to hand over the money.
The injured were later taken to the DMCH by their co-worker Md Malek around 7am. Alam was released after first aid, DMCH police outpost Sub-Inspector Bachhu Mia said.