Answer:
70 degrees latitude.
Loss of ocean habitat.
Explanation:
First question:
The most common fishery are the wild fisheries, that tend to happen in cold waters, for example, in Alaska. So it is 70 degrees latitude.
Second question:
Magnuson-Stevens Fishery Conservation: Legal provision for promoting optimal exploitation of U.S. coastal fisheries, to provide conservation for the fisheries. So the enviromental problem tackled is the loss of ocean habitat.