Ottawa was in need of some depth in net after Craig Anderson suffered a lacerated right pinky finger. He was hurt while preparing a meal at home and is sidelined indefinitely.
In parts of two NHL seasons in St. Louis, the 25-year-old Bishop appeared between the pipes in 13 games and posted a 4-5-1 record with a .896 save percentage and a 2.83 goals-against average.
The 6-foot-7 netminder had been spending this season with the Blues' AHL affiliate in Peoria. He was recently named MVP of the 2012 AHL All-Star Game and has a mark of 24-14-10 with a 2.26 GAA and an AHL-best six shutouts this season.