Fisheries Officers of the Department of Fisheries and Oceans (DFO - a federal agency) all get their firearms training at the same place as the RCMP (Depot, in Regina) and they all carry the same sidearms as the RCMP - the Smith & Wesson 5946 - a stainless steel double-action-only pistol in 9mm.
I'm a criminal lawyer in Vancouver, and I've done a number of
Fisheries Act trials (in Chilliwack, Abbotsford and Surrey) and I've had the opportunity to have this discussion with FOs a few times. By the way, FOs - to me at least - all seem to look more like school teachers than cops, and the average time on the job must be 20 years or more! It seems like good work if you can find it.
Conservation officers in BC (and every province) are a Provincial agency, created and governed by provincial law. In BC the COs carry the same sidearm that all municipal police + the Transit Police carry: the GLOCK 22 .40S&W. The only exception is the Vancouver Police (who always march to their own drummer anyway), who carry the SIG P226 DAK in .40S&W. Provincial law actually sets out the requirements for firearms and ammunition (s. 3):
http://www.canlii.org/en/bc/laws/regu/bc-reg-203-98/latest/bc-reg-203-98.html
Section 3(3) allows the Chief Constable to "authorize a member of his or her police force to carry, for a special purpose, a firearm and ammunition of a type other than that referred to in this section." - so, they could carry anything... if the Chief signs off on it. I've seen a female plain clothes member of the Abbotsford police carrying a GLOCK 26/27 before (presumably a 27, but who knows). I'm sure there are other quirks here and there.
In BC, the Sherrifs Service used to just have the old 5946's that came from the RCMP Auxillary Constable program when the NDP government disarmed the Aux. Constables (and then they all quit). But, those pistols haven't been made since 1999 and the Sheriffs Service continues to grow. Starting about 2 years ago I saw the odd Deputy here and there with a black S&W M&P... now, in some courthouses, it is like 50/50 M&P's vs. 5946. I figure eventually the old stainless warhorses will be retired. I've had the opportunity to try a few of them (RCMP and Sherrif) at the range over the years.... not a fan. The M&P is a lot easier to be accurate with. Presumably the Sheriff's M&Ps are 9mm (for ammo compatibility) but who knows.
Just to expand the discussion, there are a lot of Colt Canada C8 carbines in use by police in BC. Vancouver police ERT used to have MP5's, but it is all C8 now, and lots of patrol members have them in the trunks too. West Vancouver Police have (in at least some cars) a C8 carbine in a dashboard lock-up thing. That always looked pretty gangster to me.