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Entries in Asian carp (134)

Friday
Apr042014

Minnesota Politicians Get Tough on 'Asian' Carp

Congratulations to Minnesota politicians for serving as a shining example to the rest of the nation, as they deal with the most critical issue related to decimation of our waterways by Asian carp.

What is that issue? How can you ask such an inconsiderate question!

Of course it’s designating a new name for the exotic invaders so that no one is offended. During this utopian era of political correctness, when some want to ban the word “bossy,” what more noble endeavor could there be for those paid by taxpayers?

“Caucasians brought them to America,” said John Hoffman, a Democrat state senator who is sponsoring the bill. “Should we call them ‘Caucasian carp’? They have names. Let’s call them what they are.”

The executive director of the Council on Asian-Pacific Minnesotans added that the term “Asian carp” will cause people to “reflect negatively on our community.”

A spokesperson for the Minnesota Department of Natural Resources (DNR), meanwhile, testified that her agency was unaware of any comments from the public that “Asian carp” is offensive.

Those folks at DNR should be ashamed of themselves. They should have been on top of this months ago, as should legislatures in other states where these insensitively named invaders are destroying fisheries.

Don’t they know it’s not about whether people are offended? It’s about an obsessive need for government to eliminate the slightest possibility that people might be offended.

As soon as the enlightened Minnesota politicians force DNR to start referring to Asian carp as “invasive carp,” then they could get to work on renaming Eurasian watermilfoil, a troublesome exotic plant that has spread into many state waters. That threatens to offend people of not only Asian descent, but European as well.

And I don’t even want to think about how the zebras in Como Park Zoo in St. Paul must be suffering because of those inappropriately named mussels.

And here are some other offensive names of exotic species that we must get rid of, never mind that they simply are named after geographic areas from which they originated:

African honeybee, Brazilian pepper, Burmese python, Canada thistle, Chinese mitten crab, Cuban tree frog, English ivy, Japanese honeysuckle, and New Zealand mud snail, just to name a few.

Oh, yeah, and there’s Asiatic witchweed, Asian tiger mosquito, Asian lady beetle, Asian long-horned beetle . . .

Friday
Mar282014

Mapping the Invasion

This screen shot shows zebra and quagga mussel invasion as of 2006.

Nature Conservancy has produced some great interactive maps showing how invasive aquatic species have spread out across the country from their point of introduction.

Featured species include bighead and silver carp, zebra and quagga mussels, Eurasian ruffe, round goby, sea lamprey, and black carp.

Also, in late 2012, the organization released a report saying that aquatic invasive species “cost businesses and consumer in the Great Lakes region hundreds of millions of dollars annually in direct costs and even more from indirect costs related to removal, maintenance, and management of those species.

“Meanwhile, state and federal governments are currently forced to spend additional millions as they attempt to control the impacts and prevent the spread of AIS (aquatic invasive species).”

According to the report, the largest industry affected by AIS in the Great Lakes is tourism and recreation, which is responsible for employing more than 90,000 people in the region, generating $30.3 billion annually in revenue. Costs range from monitoring and controlling AIS to lost revenue from beach closings affecting hotels, restaurants and other tourism-related businesses.

Wednesday
Mar262014

Third Carp Species Also Threatens Great Lakes

Activist Angler caught this 30-pound-plus grass carp in a lake that has been damaged by illegal stocking of this exotic species. Photo by Robert Montgomery.

When people talk about Asian carp threatening the Great Lakes and its fisheries, they typically are referring to bighead and silver.

But a third species also potentially could damage this vast freshwater ecosystem if it becomes established in substantial numbers.

The grass carp was introduced into U.S. waters about 50 years ago, with the intent of using it to manage invasive aquatic vegetation. It has done its job--- and then some. Too often it has obliterated all vegetation in a water body, including beneficial native plants.

Additionally, it has escaped and established wild populations, as did the bighead and silver. Today the grass carp is believed to be in at least 45 states.

And now this invader poses danger for the Great Lakes.

Researchers recently documented that grass carp have spawned in the Great Lakes, specifically in Ohio’s Sandusky River, a tributary of Lake Erie. They also point out that 45 of them were caught in the Great Lakes between 2007-2012. That’s not a lot, but it’s 45 too many, especially since about half of those were capable of reproducing, meaning that an established population might already exist.

That does not bode well for bass, pike, and other inshore species that thrive in and around aquatic vegetation.

Read more here.

By the way, I have personal experience with grass carp. Years ago, ignorant property owners illegally stocked grass carp in the little lake behind my house because, they said, “they filter the water and improve the water quality.”  They did so, even though the lake contained little, if any, aquatic vegetation.

Somehow, the carp have survived and today some of them weigh 30 pounds or more. They’re the equivalent of big aquatic cows, degrading water quality, not improving it, as their wastes feed alga blooms during summer.

Also, hundreds of pounds of carp prevent growth of hundreds of pounds of bass, bluegill, and catfish. Like a farm field, a lake can sustain just so much biomass. 

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."  

Wednesday
Mar122014

Fish Pass Through Electric Barrier

The last line of defense against Asian carp entering Lake Michigan isn’t impenetrable, according to a new report by the U.S. Army Corps of Engineers and the U.S. Fish and Wildlife Service.

Fish can pass through the electric barrier unharmed when they get caught in the wakes of barges passing through. And that’s not all. Metal barges can deplete the charge, and small fish aren’t always susceptible.

"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,” says an interim report based on laboratory and field experiments.

“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."

The Corps emphasizes that the findings are preliminary, with more work to be done with the barge community and the Coast Guard to see how the barrier can be strengthened.

“There is no evidence that Asian Carp are bypassing the barriers; nor is there any indication Asian carp are in the vicinity of the barriers,” the agency says. “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.”

Critics point out that water samples taken near the barrier and in a canal on the lake side of the barrier have tested positive for the exotic fish. Plus, poisoning of the canal in 2009 revealed an Asian carp carcass.

Read more here.

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