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September 13, 2012

PCB, mercury levels continue to decrease in Lake Champlain

Lake report shows lowerlevels of contaminants

PLATTSBURGH — Fish that live in Lake Champlain appear to be recovering from contaminants that have plagued the lake and its inhabitants for decades.

A recently released report that studied mercury and polychlorinated biphynls (PCBs) in several species from the lake identified lower levels of contaminants in some samples and stable levels in others.

“It definitely does look good,” said Eric Howe, staff scientist for the Lake Champlain Basin Program on what he labeled as promising results from the independent study.

The U.S. Environmental Protection Agency has established acceptable levels of mercury in fish for consumption at 0.3 parts per million.

Both white perch and yellow perch have hovered around that mark since the late 1990s but are now well below the EPA recommendations.

Lake trout and walleye are moving closer to acceptable levels. Mercury in walleye is just below 0.5 parts per million while, in lake trout, it is below 0.4 parts per million.

“We’re optimistic that these species will all be below that line (of 0.3 parts per million) in the next five to 10 years,” Howe said.

LOWER PCB LEVELS

The degree of PCB pollution is best exemplified by the positive results in Cumberland Bay, where industrial sludge beds had created heavy contamination in the bay’s yellow perch and other species.

The State Department of Environmental Conservation had issued advisories against eating fish from the bay, but those warnings were adjusted following a successful cleanup of the sludge beds in the early 2000s.

The recently completed study, conducted by Biodiversity Research Institute in Maine, utilized fish that were caught during the 2011 Lake Champlain International Fishing Derby.

“The lake trout we looked at had lower PCB levels (than reported in previous study),”

said Ian Johnson, an institute research specialist. “We targeted the main lake for sample collection.”

Research staff members were posted at five of the eight weighing stations during the popular Father’s Day weekend tournament, Johnson said. For mercury sampling, researchers removed some tissue from lake trout but treated the fish with antibiotics and sutured the incision before releasing them back into the lake.

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