I like that you brought up the difference in taste and use of both fish. I definitely forgot about that point when I was thinking about their differences. It seems the fact that Pollock was never a globally desirable fish might have contributed to why it is still around. It also makes me wonder what humans will find as the next gold rush, after exploiting the most desirable fish and meats. I think, as things begin to disappear, a lot of undesirable animals will all of a sudden become desirable.
