Here's an article on the size of fish caught in the Florida Keys over the last 50 years. The same thing happened to La Jolla, big fish were very common here 50 years ago. I like to catch and eat fish but it is important to me to save some for future generations.
http://scrippsnews.ucsd.edu/Releases/?releaseID=959
Trophy fish caught on Key West charter boats: a) 1957, b) early 1980s and c) 2007.