Growing Algae Plague Worries New England Fishermen
Pastor Dale Morgan
Aug 26, 12:40 AM EDT
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Growing Algae Plague Worries New England Fishermen*
By LISA RATHKE
Associated Press Writer
STOCKBRIDGE, Vt. (AP) -- It looks like a clump of soiled sheep's wool, a
cottony green or white mass that's turning up on rocks and river
bottoms, snarling waterways. Already a scourge in New Zealand and parts
of the American South and West, the aquatic algae plague called "rock
snot" is creeping into New England, where it is turning up in pristine
rivers and alarming fishermen and wildlife biologists.
"It scares me," said Lawton Weber, a fly fishing guide, who first
spotted it on the Connecticut River in northern Vermont in June. "It's
an aesthetic eyesore when it's in full bloom mode and its impact on the
trout population is going to be significant."
Over the past 10 years, the algae with a scientific name of
Didymosphenia geminata, or didymo, has turned up in California,
Washington, Alaska, Idaho, Montana, Nevada, Utah, Wyoming, Colorado, the
Dakotas, Missouri, Arkansas and Tennessee.
"We're starting to realize it's all over the place," said Karl Hermann,
a regional waste monitoring and assessment coordinator for the
Environmental Protection Agency in Denver.
What started out in Vancouver Island in British Columbia "has suddenly
just skyrocketed," he said.
The algae has the potential to bloom into thick masses with long stalks,
blanketing the bottoms of some streams, threatening aquatic insect and
fish populations by smothering food sources.
In New England, it has turned up in the White River, Connecticut River
and the Batten Kill, a trout fishing mecca in southern Vermont that's
famed for its hard-to-catch fish. Quebec is grappling with it in
Matapedia River in the lower St. Lawrence.
There's no easy way to get rid of it. Experts say the only hope is to
keep it from spreading. But that's a lofty challenge, since a single
cell carried on absorbent fishing gear or clothing can be transferred -
unknowingly - into other waters.
Vermont and New Hampshire have launched a radio campaign urging river
users to scour their boats and clean their gear.
"Please don't take chances, disinfect your fishing gear," said Scott
Decker, program supervisor with the New Hampshire Fish and Game Department.
It's unknown yet what effect, if any, the algae will have on fish
populations, according to Sarah Spaulding, an ecologist with the U.S.
Geological Survey and the EPA. But many are concerned.
"Once you remove (insects), young fish don't have anything to eat," said
David Deen, a Vermont lawmaker who is a fishing guide and river steward
for the Connecticut River Watershed Council. "Growth is slowed at best,
and at worst they could starve to death."
In South Dakota, the algae is suspected of decimating brown trout
populations in some spots.
Not only does rock snot threaten fish, but it's an unsightly nuisance.
Fishermen complain that they can't cast their lines or they pull them up
covered in gunk.
Jeff Williams, Arkansas' trout program supervisor, said out-of-staters
were disappointed to find that the White River "wasn't as clean of a
river as it used to be. The gravel is covered with didymo."
Once rare, the algae is perplexing scientists with the frequency of
nuisance blooms.
"It seems to be something different - this expansion and production of
big masses in the U.S.," Spaulding said.
Where it once preferred high-altitude, low-nutrient rivers, rock snot
has shown up in rivers in Missouri, Arkansas and Tennessee, raising
questions about what triggers its growth. Dammed rivers provide a
constant water flow for it to bloom, and drought and changes in sunlight
may also play a role.
"We think there are other factors that we don't yet know about," said
Spaulding.
In New Zealand, the algae has infested as many as 55 waterways on South
Island, growing up to 7 inches thick. Scientists are trying a copper
treatment to manage it, and anyone who knowingly spreads the algae is
treated as a criminal. The penalty: up to five years in prison and/or a
fine of up to $100,000.
For now, the algae is in its early stages in New England, forming nubby
brown growths on rocks.
"I think all of the Northeast is tuned in to see what the effects will
be, so they can start taking preventive measures," said Mary Russ,
executive director of the White River Partnership.
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On the Net:
Vermont Department of Environmental Conservation:
http://www.anr.state.vt.us/dec
Environmental Protection Agency:
http://www.epa.gov/region8/water/didymosphenia
Federation of Fly Fishers: http://www.fedflyfishers.org/conDidymo.php