The Navigable Waters Act governs usage of all waters deemed "navigable." This includes bodies (creeks, rivers etc...) which are navigable by canoe... so the answer is... you "probably" have legal access to hunt the river. As far as retrieving game which has been shot and killed OR shot and wounded... the Fish and Game Act "REQUIRES" you to recover said game with "all due diligence," including if this means crossing onto private land to do so. The suggestion is made that you should obtain permission to pursue or recover game from private property whenever possible and where it is "expedient."