I think you're referring to the Alexandra Morton and B.C. court case. The company involved in that was Marine Harvest.
In B.C., if you're not familiar with this, the aquaculture fish farms were for awhile a little bit like a child of divorced parents who were fighting: nobody knew who was doing what with the fish. Sometimes they were on land and under the B.C. Ministry of Agriculture, and sometimes they were in the ocean, obviously, and then under federal authority.
Alexandra Morton, a scientist with decades of experience in this area, brought a challenge. The court decided that it was not constitutional for the province to deal with aquaculture, that it was exclusively a federal head of power, and that it was ultra vires subsection 91(12) of the Constitution for the province to attempt to regulate that.
I do know that there are potentially other issues with delegating authority over fisheries to the provinces—among them, that different provinces have different ways of dealing with fisheries right now. We have a lot of different types of water bodies in Canada, a lot of different species of fish, and a lot of different types of development that happen in those water bodies. If we're trying to actually make a consistent, predictable process across Canada, I don't understand how delegating it to different authorities under different provinces and territories actually accomplishes that.
Moreover, there are potentially constitutional problems with it.