Well, just found this one on another site.... seems we need to catch and kill more bass, because of the decline in menhadden population
We may need to increase commercial and recreational catch of Stripers to improve the health of the species, according to this article from AP.
Survival rate of striped bass falls
By The Associated Press
Biologists are trying to find out why the survival rate of striped bass, whose numbers rebounded under strict catch limits in the Chesapeake Bay, appears to be falling.
"There’s an increased concern by fisheries managers that we could be looking at some future crash" of the striped bass population, said Wolfgang Vogelbein, a scientist at the Virginia Institute of Marine Science.
Pollution, disease or starvation could be at fault, biologists say. Some scientists are also beginning to ask whether the recreational-catch limits and commercial-harvest quotas, which helped the striped bass recovery, are too restrictive.
"We’ve got a rare case of a species coming back to high abundance and are now seeing things that may be problems caused by this high abundance," said Desmond Kahn, a biologist with the Delaware Division of Fish and Wildlife.
If the trend continues, the decline would be the first threat striped bass have faced since the 1980s, when overfishing whittled down their numbers to such a point that the federal government banned fishing for the species from North Carolina to Maine.
The Atlantic States Marine Fisheries Commission, composed of Virginia and 14 other Atlantic states, engineered the moratorium. It earned accolades from conservationists worldwide when the striped bass population rebounded to record highs.
The Atlantic commission declared the striped bass "fully recovered" in 1995.
Known in the bay as rockfish, striped bass now support a multimillion-dollar sports fishing industry in Virginia and are regularly pursued by commercial netters. The state controls the sport and commercial harvests through catch quotas imposed by the Atlantic commission.
About 75 percent of the coastal striped bass population is spawned in the bay. Most of the fish live there for several years until they mature. They then join the adult population that generally migrates offshore from North Carolina to Maine’s coastal rivers, returning to the bay each year to spawn.
The commission’s estimates continue to show robust population growth. Striped bass have been reproducing so successfully in the bay, however, that the population may be able to tolerate increases in mortality, Kahn said.
Yet biologists are trying to figure out why young striped bass in the bay aren’t living as long as they once did.
The bay’s striped bass enjoyed a survival rate between 60 percent and 70 percent through the mid-1990s, Kahn said. That rate, however, dropped to 40 percent to 50 percent in 1998 and has remained about the same since then.
Kahn said an analysis of tagged fish indicates the numbers are declining because the striped bass are dying — not because they are being harvested.
One possible cause could be a disease called mycobacteriosis, which was discovered in the bay’s striped bass in 1997, a year before striped bass survival rates fell.
At first, an estimated 10 percent of the bay’s resident striped bass were believed infected with the disease, which often leaves red sores on a fish’s flanks and attacks its internal organs. Now, more than 70 percent of the fish are infected, said Vogelbein, the VIMS scientist.
Another problem could be pollution. Nutrients from sewage-treatment plants and polluted runoff from farms and development create algae blooms that leave a vast "dead zone" in the bay’s depths devoid of oxygen. Striped bass normally seek summer refuge in deep water but now must make do in shallower water that contains oxygen but is warmer than the fish prefer.
Scientists also say menhaden, which striped bass eat, have declined in population. Studies show that menhaden represented 80 percent of the striped bass’s diet in the Maryland portion of the bay in the 1950s.
"Now, it’s down to 20 percent of their diet," said Kahn, who notes that striped bass have gotten skinnier over the years.
Jim Price, a former Maryland fishing guide, has been arguing for years that striped bass are going hungry in the bay.
"We need to kill more of these fish," he said of striped bass. "I want to see the bay get back into balance."
Researchers say a work session scheduled next month on the ecological role of menhaden in the bay may begin to shed light on whether changes in the menhaden population are affecting striped bass.