The article (it is one that Sam emailed to us--and it is attached) basically says that fish are being caught in deeper and deeper water each year. Certain areas change faster; antarctic fish have moved from 100 meters in the 1960s to 600 meters now, while bottom dwelling fish have only moved down 42 meters in the last 50 years.
There are data tables and graphs in the article, if you care to see more
Articles
There are a couple things that I put on RefWorks while doing the library assignment. Some of them sound like they will be useful...but I haven't looked into them too much.