No catch and release permitted for smallmouth Bass in the Margaree River watershed in Cape Breton Nova Scotia. The Margaree River is the premier Atlantic Salmon River in Nova Scotia.
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https://www.cbc.ca/news/canada/nova-scotia/catch-kill-fish-order-1.7318037
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If anglers catch a smallmouth bass or chain pickerel in those areas, they must euthanize the fish humanely and retain it. Tossing it back or keeping a live one could lead to a fine of up to $100,000 for a first offence and up to $500,000 for a second offence with the possibility of two years' jail time
https://www.cbc.ca/news/canada/nova-scotia/catch-kill-fish-order-1.7318037