Yes, the position has existed in the past. It was terminated by the federal government in 1996. In 2007, the Harper government appointed Canada's last fisheries ambassador for conservation. Since the current government's tenure, there has been no ambassador appointed.
I truly feel this is a big loss for the industry, in that the ambassador would have the best interests of all Canadian fishery stakeholders in mind. They would be a champion for the Canadian industry and help tell a good story abroad that really deserves to be told about the high levels of protection that all of Canada sees and enjoys, and about the collaborative efforts that have taken place through groups like the Canadian Whale Institute.