Google search yields..
https://ca.pokernews.com/news/2017/04/are-poker-winnings-taxable-income-in-canada-17323.htm
Decision is, are you pro or not. If you have a regular job and play casually the no you are not a professional, you are a lottery winner and they are not taxable... as always, confer with your lawyer for a definitive answer, if there is one.
By the way, nice catch, I bet you can recall a lot of big flips and bad beats you laid to win. Good job.