History is dragging me back.
I looked it up, and we have a federal body of legislation right now that, among other things, is designed to protect Canadian species whose capture, possession, and transportation are regulated by provincial or territorial laws, whose introduction into Canadian ecosystems could endanger species. The act forbids the import, export, and interprovincial transportation of these species unless the specimens are accompanied by appropriate documents and applies to plants, animals, alive or dead, as well as to their parts and any derived products. Then you go to the act itself, and the definition of animal includes fish.
I asked DFO the same question, and they didn't seem to know what pre-existed, so obviously there's some work we need to do in building that body of the legislation.