I don't know specifically about current hiring minimums, but I have heard that float operators are in demand. Figures I've heard tossed around are 100 hrs of float time, but likely your twin experience could compensate. As far as a list of contacts goes, check out the following links. They contain fairly extensive listings of the aircraft operators throughout Canada, so you can call them up and ask them what they're looking for.
http://www.aviatorselect.com/index.stm
http://www.canadian-aviation.com/
Good luck! And if you find out anything interesting be sure and let us know.
SpiralDive