North Atlantic right whales have been classified as critically endangered by an international conservation group, with the world population just over 400.
The Quebec government says residents must, as of Sunday, complete online registration forms to be able to travel through Atlantic Canada to reach the Quebec islands in the Gulf of St. Lawrence.
Environmental groups had argued the decision to extend an exploration drilling licence beyond the term limit was unlawful and lacked proper environmental oversight.
The report by the Marine Animal Response Society and the Canadian Wildlife Health Cooperative says necropsies were done on five of the nine whales found dead between June and July 2019.
The Cabot Strait, which runs between Cape North, N.S. and Cape Ray, N.L., is an essential corridor for North Atlantic right whales migrating to the Gulf of St. Lawrence.