Opening dates for 2011
This link that shows the opening dates for 2011 in quebec for species in zone 8, wich is the area of montreal and surroundings. it's in french so here are the main speicies translations.
Brochet : pike
Doré : walleye
Achigan : bass
bar rayé: stripped bass (there really is'nt much around here but there is some and they must be released).
Those are the main species.
Other things i can say is to pay attention to restrictions like zones and sanctuaries that are closed all the way to july 1st or at all times.
Make sure you get your fishing lisence wich can be purchased starting april 1st.