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Nope, you don't have to renew your TRV. Once you enter Canada, the officer at the Port of Entry usually grants a 6 month visit (stamp the date of your arrival), but if s/he writes another date, then that puts the limit on the 6 months. If you wish to extend, then send an application before the expiration of the visit given you. Once you're sure that CPC-Vegreville has received your application, you'd be on implied status until they grant you an extension (send you a Visitor Record) or send you a refusal letter.
Nope, you don't have to renew your TRV. Once you enter Canada, the officer at the Port of Entry usually grants a 6 month visit (stamp the date of your arrival), but if s/he writes another date, then that puts the limit on the 6 months. If you wish to extend, then send an application before the expiration of the visit given you. Once you're sure that CPC-Vegreville has received your application, you'd be on implied status until they grant you an extension (send you a Visitor Record) or send you a refusal letter.