Subject: NANFA-L--Snakehead News Story
From: Hoover, Jan J ERDC-EL-MS (Jan.J.Hoover at erdc.usace.army.mil)
Date: Tue Oct 05 2004 - 14:25:19 CDT
>From the Washington Post:
Baby Snakehead Is No Bundle of Joy : Scientists Say Fish Is Breeding in
the Potomac and Can't Be Wiped Out
By David A. Fahrenthold and Joshua Partlow
Washington Post Staff Writers
Tuesday, October 5, 2004; Page B01
The latest northern snakehead fish found in the Potomac River may be the
most significant yet: It's a baby, three inches long and proof that the
Asian predator is breeding in native waters, scientists say.
With the discovery last week in Alexandria, biologists now confront a
scenario that was considered a kind of ecological nightmare. The snakehead,
they said, will be nearly impossible to eradicate and could drive out other
Potomac wildlife, even threatening the river's plentiful bass population.
An Alexandria resident discovered this three-inch baby snakehead in a
clump of hydrilla in Dogue Creek. Officials confirmed the finding, proof
that the Asian predator is breeding in local waters. (Va. Department of
Game and Inland Fisheries)
"The snakeheads are in charge," said Walter R. Courtenay Jr., an expert
with the U.S. Geological Survey.
The northern snakehead, a native of China and Korea, is a voracious
predator that can grow several feet long. It first gained notoriety in this
area in 2002, when a pair were discovered in a Crofton pond,
along with thousands of young. The pond was poisoned to kill the fish.
The species reappeared in force this summer, as anglers caught 19 adult
snakeheads in the Potomac and its tributaries. Scientists aren't sure where
the first Potomac snakeheads came from but say it's likely
that they were imported for food or as aquarium fish and then dumped.
As the summer went on, each new catch made it more likely that the fish was
here to stay, scientists said. But they held out hope because, despite
weeks of intense searching with electro-shocking equipment,
no juvenile snakeheads had been found.
That changed Wednesday, when Alexandria resident Jack Ferris noticed a fish
flopping around in a clump of hydrilla -- an underwater grass -- at his
subdivision's boat ramp on Dogue Creek.
Someone else at the ramp said it was a minnow, but Ferris, 58, thought he
recognized the small gray-green fish as something else.
"That is a spittin' image" of an adult snakehead, Ferris remembered
thinking. "But it's just a mini."
Ferris took the fish, which he nicknamed Skippy, home in a Gatorade bottle
and called Virginia authorities.
On Friday, it was confirmed: Skippy was a snakehead probably born this
summer in Dogue Creek, a Potomac tributary that has yielded a concentration
of the fish, according to the Virginia Department of
Game and Inland Fisheries.
Knowing that snakeheads lay a massive amount of eggs, scientists reasoned
that there are likely hundreds or thousands more juvenile fish in the
"Eradication, then, is not going to happen," said Julia Dixon, a
spokeswoman for the Virginia agency. "We're going to have to manage them."
In the short term, both Maryland and Virginia authorities said the new
discovery would not alter their efforts against the snakehead.
One of their strategies: After the underwater grasses recede in cold
weather, Maryland authorities plan to sweep through the shallows with huge
nets, trying to catch more of the youngest generation.
The snakehead is not the first nonnative species to invade the Potomac;
before it came the blue catfish; the carp; even hydrilla grass, another
But officials in both states conceded that this new predator might have
serious effects that might not be fully realized for a decade or more.
"There's only so much room out there for so many fish," said Steve Early, a
biologist with the Maryland Department of Natural Resources. "You're
probably going to displace something."
Many worry that the snakehead's victims might include the largemouth bass.
The Potomac is known nationally as a bass fishery, with about 60 fishing
tournaments a year in Charles County alone.
Fishermen buy gas and food and stay in hotels in communities along the
river, said Joanne Roland, Charles County's director of tourism. Each of
the larger televised tournaments, with about 400 anglers,
contributes about $250,000 to the local economy, she said.
"This is one of the top five bass fisheries in the country. It is not just
another fishing hole," said Steve Chaconas, 48, of Stratford Landing, who
guides bass fishing trips on the Potomac. "When you have an
invasive species, it really throws the whole food chain out of balance."
The problem, he said, would not stem from adult snakeheads squaring off
against adult bass but from snakeheads preying on the zooplankton and
smaller fish, such as shad and perch, that young bass need
"If you're a fisherman, I think eventually you will notice the difference,"
Chaconas said. "This will disturb the food chain. This will cause
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: Fri Dec 31 2004 - 11:27:38 CST