If it has not changed, the ratio of FA/pax in Canada is 1 per 40 with a minimum crew depending on aircplane type.
If I am not mistaking, the minimum crew on the CRJ is 1 and Transport Canada has accepted a ratio of 1 per 50 on that airplane. (I could be wrong)
I have flown many time the Air Canada CRJ (EWR-YUL, PHL-YUL). Depending on the load, there was one or two FA's. On those flights, unlike US Airways
for instance, Air Canada
serves a light lunch (or breakfast) with a full bar service.