i did some research on this and ran into what seems some conflicting laws .......
http://www.bclaws.ca/EPLibraries/bclaws_new/document/ID/freeside/00_96145_01
read section 9
9 (1) Unless authorized by the regulations or a permit, a person must not discharge, carry or have in the person's possession, in or on a railway car, hand car or other vehicle on a railway, or in or on a motor vehicle, wagon, sleigh, aircraft, bicycle or other conveyance, a firearm containing live ammunition in its breech or in its magazine.
(2) A person who contravenes subsection (1) commits an offence.
................
" any other conveyance " can include a boat .
BUT ;
read section 27 a here ,
http://www.bclaws.ca/EPLibraries/bclaws_new/document/ID/freeside/00_96488_01
27 (1) A person who discharges a firearm or wounds or kills wildlife from a motor vehicle or from a boat that is propelled by a motor commits an offence .
and here , about 1/2 way down ;
http://www.ec.gc.ca/alef-ewe/default.asp?lang=En&n=304CC675-1
[h=2]Hunting from a Boat[/h]Hunters are permitted to hunt from a power boat as long as the motor is turned off (not in operation) and the boat has stopped its forward progress before firing commences.