The Department of Fisheries and Oceans set a Dec. 14 deadline for comments on the matter, which CBC News said could doom the tuna industry on Prince Edward Island.
"It would become illegal to fish the species," said Sophie Bastien-Daigle, regional manager of the DFO species at risk program. "There would have to be other measures put in place to ensure its recovery."
Bluefin is a popular fish at sushi bars around the world and fetches a high price, CBC News said. About 350 commercial PEI fishermen are licensed to catch bluefin.
The Department of Fisheries and Oceans is expected to make a decision on the listing next year.
"We would actually like to hear from all Canadians who could be affected," said Bastien-Daigle. "We want to hear from them about their views on bluefin tuna, about how they would be affected by a listing decision."