This area does not yet contain any content.
Get Updates! and Search
No RSS feeds have been linked to this section.

 

 

 

 

 

 


 

 

 


 

 

 

Entries in Mississippi River (39)

Wednesday
Mar122014

Asian Carp Eggs Found in Upper Mississippi River

 

Just when we think that we know what is going on with Asian carp . . . 

The U.S. Geological Survey (USGS) says that researchers found eggs, including late-stage embryos, in samples collected last summer from the Upper Mississippi River, as far north as Lynxville, Wisc. 

Here's more from the USGS:

"This discovery means that Asian carp spawned much farther north in the Mississippi than previously recorded," said Leon Carl, USGS Midwest Regional Director. "The presence of eggs in the samples indicates that spawning occurred, but we do not know if eggs hatched and survived or whether future spawning events would result in live fish."

The Asian carp eggs and late-stage embryos were discovered two weeks ago while processing samples that were collected in mid-May and mid-June, 2013. The samples were taken as part of a larger research project designed to identify Asian carp spawning habitats. The eggs and late-stage embryos were 250 river miles upstream of previously known reproductive populations in the river. Spawning would have occurred upstream from this site.

Once the scientists visually identified the eggs, they examined other samples taken from the Mississippi River and found Asian carp eggs at seven locations between Pool 19 near Keokuk, Iowa, and Pool 9 of the main channel of the Upper Mississippi River near Lynxville. Iowa, Missouri, Illinois, Minnesota and Wisconsin border the navigation pools where these samples were collected.

The eggs and late-stage embryos were identified as bigheaded carps — either bighead carp or silver carp — through visual analyses of specific features of the eggs and embryos. It is also possible that some eggs could be from grass carp, although no eggs were visually identified as such. The USGS attempted genetic analyses to definitively determine which species of Asian carp the eggs belong to, but the results were inconclusive. Additional steps are being completed to attempt genetic confirmation, and those results are expected in one to two weeks.

The research project that collected these eggs is being coordinated by the USGS in collaboration with Western Illinois University. Scientists plan to collect additional samples from the Mississippi River in 2014 as part of their on-going research project.

"Invasive Asian carp could pose substantial environmental risks and economic impacts to the Upper Mississippi River if they become established," Carl said. "Further research will help us to better understand their habitat requirements and inform integrated control efforts."  

Friday
Feb142014

Electric Barrier Is NOT Stopping Fish

Oh, yeah! That electric barrier is going to keep Asian carp from entering Lake Michigan via a manmade connection to the Mississippi River basin.

Or maybe not.

A video obtained by the Milwaukee Journal Sentinel shows small fish swimming through the electrified water, just 35 miles downstream from Chicago’s lakeshore.

And no one said that the invaders must be adult fish.

“The only thing holding back the Asian carp at the moment is the electric barrier, but few people beyond Illinois politicians, the canal-dependent barge industry, and the Army Corps are buying the idea that the barrier is doing its job. Many worry the agency's continued confidence in this leaky, last line of defense will take a tragic toll on the Great Lakes, the world's largest freshwater system,” said the newspaper.

Thursday
Feb062014

Invasive Species Threat Goes Both Ways

Mostly resource managers have been concerned about Asian carp invading the Great Lakes through a manmade connection with the Mississippi River basin. But exotics already in the lakes also could migrate out and spread into rivers throughout the Midwest, if the electric barrier separating the two systems is not 100 percent effective.

One of those is the Eurasian ruffe, a small perchlike fish that entered Lake Superior during the mid 1980s in the ballast water of European freighters. It then spread to Lakes Michigan and Huron, and, this past summer, researchers found ruffe DNA in Chicago’s Calumet Harbor.

“The Eurasian ruffe is a relatively small fish that produces a lot of eggs and reaches maturity very quickly,” said Lindsay Chadderton, Aquatic Invasive Species Director for The Nature Conservancy’s Great Lakes Project. “They feed from the bottom of the food chain, and they’re going to compete with native and introduced species dependent on the same fauna.”

On the positive side, Illinois officials emphasized that no live ruffe have been captured in the harbor. They said that the DNA could have come from a bait bucket or ballast tanks, not an actual fish.

Still, even the possibility that the ruffe could be poised to spread inland underscores how vulnerable both the lakes and the Mississippi River basin are to invasive species and the need for an effective two-way barrier, according to The Nature Conservancy and other conservation groups.

(This article appeared originally in B.A.S.S. Times.)

Friday
Dec272013

Electric Barrier Isn't Keeping Fish Out of Lake Michigan

 

You know that expensive electric barrier erected to keep carp out of the Great Lakes?

Uh, well, that isn’t working so well, according to a new report from the Army Corps of Engineers. That’s because small fish can ride in on the flow behind barges crossing the barrier.

In a new report, the Corps says the following:

"Initial findings indicate that vessel-induced residual flows can trap fish and transport them beyond the electrical barriers, and that certain barge configurations may impact barrier electric field strength. Additionally, the preliminary (sonar camera) findings identified the potential for small fish (between 2-4 inches in length) to pass the barrier array in large groups, or schools."

Crews dropped in a camera 10 minutes at a time to see what was happening. In 61 percent of the 72 samples, they saw entire schools of fish, “not believed to be Asian carp,” swimming through.

But not to worry:

"There is no evidence that Asian carp are bypassing the barriers. Nor is there any indication that Asian carp are in the vicinity of the barriers," states the report. "The closest adult Asian carp found in the Illinois River are about 55 miles from Lake Michigan, and no small Asian carp have been observed closer than 131 miles from Lake Michigan."

So . . . it’s okay that we are spending millions of dollars to maintain a barrier that doesn’t work because, well, it doesn’t have to work because the Corps says the invaders are far, far away and don’t pose a threat.

Gee, that makes me feel so much better. I have to wonder, though, if the Corps is as competent at estimating the threat as it is at defending against it. 

Monday
Oct212013

As Mussel Threat Moves West, Feds Sit Back and Watch

The federal government is doing a pitiful job of protecting our waters from invasions by exotic species. And I’m not talking about its reluctance to remove the manmade connection between the Mississippi River basin and Lake Michigan. Yeah, that’s a problem, but its failure is more all-encompassing.

During the 1980s, Asian carp escaped aquaculture facilities in the South, riding into the Mississippi and other rivers on flood waters. Within a decade, we knew that bighead and silver carp were crowding out native species, with the latter also a serious threat to recreational boaters because of its tendency to go airborne when frightened.

Yet, incredibly, the silver carp was not listed as an injurious species under the federal Lacey Act until 2007 and the bighead carp until 2011.

With the zebra mussel, the feds were a little more prompt. After it was discovered in Lake St. Clair in 1988, it was listed in 1991.

But the quagga, identified as a separate species about that same time, still is not.

What’s the big deal?  Well, invasive species don’t respect boundaries, and, under the Lacey Act, those who transport injurious species across state lines can be both fined and jailed for misdemeanors or felonies. Felony trafficking violations are punishable by a maximum of fine of $20,000, five years in prison, or both, and property used to aid the offense may be subject to forfeiture.

Had the weight of that law been hanging over his head, whoever carried quagga mussels across the Rockies in 2007 might have been a little more conscientious about cleaning his boat and trailer before beginning the journey to Lake Mead.

And if listing of both species had been combined with a more aggressive publicity and enforcement campaign by the feds, the two invaders might not now be threatening waters all over the West.

Already in the East, they’ve crowded out native species, disrupted food webs, fouled recreational beaches, and cost taxpayers billions of dollars in maintenance costs because of their tendency to clog water intake and delivery pipes and infest hydropower infrastructures.

“The little critters are a serious threat to the United States,” said Larry Dalton, recently retired invasive species coordinator for Utah, where mussels already have forced $15 million in repairs to water-delivery systems.

In a 2010 report, the Western Regional Panel on Aquatic Nuisance Species (WRP) estimated that zebra mussels already had been responsible for $94,474,000 in direct and indirect costs for Idaho.

And the Pew Charitable Trusts warned, “Their rapid spread threatens water supplies and energy systems in the West, a region heavily dependent upon hydropower and often gripped by drought. In response, state officials have stepped up boat inspections and cleaning efforts . . .”

Right now, western states are trying to protect their waters from quaggas with a patchwork of rules and regulations. But anecdotal evidence suggests the piecemeal strategy isn’t effective, especially as a deterrent.

For example, a trucker was stopped last fall as he entered Washington State, towing a boat that with about 100 zebra mussels attached. The offender had been caught doing the same thing in 2010. And during questioning, he said that he also had been detained in another state with a contaminated boat.

So why isn’t the quagga mussel listed under the Lacey Act? You’ll have to ask the bureaucrats at the U.S.  Fish and Wildlife Service (FWS) about that and why Pew estimates the agency could take as long as 10 years to take action.

“It basically takes an act of God to put something on the injurious wildlife list,” said Leah Elwell, WRP coordinator.

Or an act of Congress. That’s why Rep. Joe Heck of Nevada is sponsoring H.R. 1823, the Protecting Lakes from Quaggas Act of 2013.

And that’s why the Western Governors’ Association is supporting it.

“This (the act) would invest federal and state authorities with an important tool for containing and eradicating quagga mussels by providing for increased inspections of boats cross state lines,” they said.

The act makes sense, of course, and thus should pass with bipartisan support. But that doesn’t mean it will.

Nor would its passage ensure that federal officials would vigorously prosecute offenders.

If past performance is an indication of future actions, the feds will continue to sit back and watch as quagga and zebra mussels spread throughout the West, as they have in the East.