Duh. Even small numbers of striped bass (rockfish) will be adversely affected by polluted waters.
http://www.washingtonpost.com/wp-dyn/content/article/2006/03/10/AR2006031002416_pf.html
"Chesapeake's Rockfish Overrun by Disease
Epidemic Hits Species Hailed for Revival, Then Weakened by Polluted Waters
By Elizabeth Williamson
Washington Post Staff Writer
Saturday, March 11, 2006; A01
A wasting disease that kills rockfish and can cause a severe skin infection in humans has spread to nearly three-quarters of the rockfish in the Chesapeake Bay, cradle of the mid-Atlantic's most popular game fish.
The mycobacteriosis epidemic could carry profound implications for the rockfish, also known as striped bass. The fish fuel a $300 million industry in Maryland and Virginia, but because the bacteria kill slowly, effects on the stock are only now emerging.
The disease also sends a grim message about the entire bay ecosystem. The rockfish remains bay conservationists' only success story -- a species nearly wiped out, then revived by fishing limits.
But as the number of rockfish surged, the fish remained in a body of water too polluted to support the level of life it once did. That made them vulnerable to a malady researchers did not see coming -- a signal, some scientists say, that controlling fish harvests is no longer enough to ensure long-term survival of a species.
"We used to think that if you got hold of fishing, all your problems would be solved," said James H. Uphoff Jr., a biologist at the Maryland Department of Natural Resources. "But now all these ecological problems crop up, and we don't understand them.""