Tagged: invasive species

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Environment & Science
10:00 am
Sat July 7, 2012

Hunt for Asian Carp resumes near Lake Michigan

Credit user MirkoB / Wikimedia Commons
Juvenile silver carp, seen here, can grow up to weigh 100 pounds.

TRAVERSE CITY, Mich. (AP) - Authorities plan another intensive search for Asian carp next week after repeatedly detecting DNA from the invasive fish in Chicago's Lake Calumet.

Officials said Friday that genetic material from silver carp was found in samples taken in May and June. Policy requires stepped-up efforts to find the fish whenever their DNA turns up during three consecutive rounds of sampling in the same area.

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Environment & Science
1:01 am
Wed June 20, 2012

Illinois officials downplay postive test for Asian Carp DNA near Lake Michigan

Credit Illinois DNR
A Bighead carp caught in June of 2010 in Lake Calumet, Illinois

Illinois officials are downplaying the recent discovery of Asian Carp DNA in a waterway a short distance from Lake Michigan.

Asian Carp are an invasive species that experts fear could devastate fish native to the Great Lakes.

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Environment & Science
11:59 am
Wed June 6, 2012

Arkansas man charged for illegally selling Asian carp in Michigan

Grass carp
Credit USGS
Grass carp have been illegal to sell in Michigan for decades.

A man was charged with 12 felony counts for illegally selling live Asian carp in Michigan. And he wasn't too inconspicuous - "grass carp" was apparently written on the side of his truck.

From the Michigan DNR:

...the Attorney General's Criminal Division has charged an Arkansas man with 12 felony counts of possessing and selling live Asian carp in violation of state law protecting against the spread of invasive species. The charges follow a joint investigation by the DNR's Special Investigation Unit and Commercial Fish Enforcement Unit.

Grass carp are a type of Asian carp. Grass carp have been illegal to sell in Michigan for decades because the invasive species is a voracious plant eater.

Officials say grass carp "could potentially remove all vegetation from a body of water at the expense of native species."

The fish were imported in the 1960's and have been used to control weeds in ponds.

State officials say David Shane Costner, 42, of Harrisburg, Ark., had 110 grass carp housed in a semi-truck. Costner was working for Farley's Arkansas Pondstockers.

More from the MDNR:

Costner allegedly traveled around the state, conducting sales of the illegal carp from store parking lots. The trucks also contained live fish species permitted under state law, including channel catfish, largemouth bass and fathead minnows. On May 16, 2012, Costner allegedly sold two of the live grass carp to undercover DNR investigators in Midland, Mich.

David Eggert of MLive reports Costner's truck had the words "grass carp" written on the side.

The wildlife agency received a tip that Costner had been selling illegal carp at several locations in southern Michigan and the west side of the state, Golder said... Costner could not be reached for comment. A secretary who answered the phone at Farley's said he no longer works there.

Grass carp are just one of four species of Asian Carp officials are worried about. And Grass carp appear to be the least of their worries when it comes to threats to the Great Lakes.

The Asian Carp Regional Coordinating Committee lists three Asian Carp that are of concern - Grass carp are not on the list:

There are three species of Asian carp that are considered invasive and a threat to the Great Lakes: the bighead, silver and black carp. Silver and bighead carp are filter-feeding fish and consume plant and animal plankton. Asian carp can grow to large sizes: some as large as 110 pounds, though the average size is around 30-40 pounds. Bighead and silver carp are voracious eaters, capable of eating 5-20 percent of their body weight each day. They consume plankton—algae and other microscopic organisms—stripping the food web of the key source of food for small and big fish. Black carp differ in that they consume primarily mollusks, and threaten native mussel and sturgeon populations. They can grow to seven feet in length and over 100 pounds.

Environment & Science
10:27 am
Wed May 30, 2012

Invasive species hit your pocketbook

Credit user drow_male / wikimedia commons
Sea lamprey cost taxpayers millions every year to control.

The Nature Conservancy has released an analysis saying that invasive species such as zebra mussels and sea lamprey cost businesses and consumers hundreds of millions of dollars each year, besides damaging the environment in the Great Lakes region.

Power companies spend $130 million annually removing mussels from electric plants.

The report out yesterday said tourism and other industries lose $50 million a year in reduced demand because of invasive species.

The study conducted by Anderson Economic Group of East Lansing says the situation will get worse if Asian carp reach the Great Lakes.

Environment & Science
6:24 pm
Tue May 8, 2012

Feds say they'll act quicker to release study on keeping carp out of Great Lakes

Asian carp at Chicago's Shedd Aquarium.
Credit Kate Gardiner / Creative Commons
Asian Carp at Chicago's Shed Aquarium

The federal government says it will speed up a decision on how to protect the Great Lakes from invasive species in the Mississippi River basin. The Obama administration announced the new timetable Tuesday.

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Environment
8:49 am
Thu May 3, 2012

Invasive species success story: Purple Loosestrife

Purple Loosestrife is a widespread invasive plant. It’s taken over wetlands in every state in the US except Florida. But now, scientists consider Purple Loostrife an invasive species success story.

Purple Loosestrife are the tall bright purple flowering plants you see mixed in with cattails lining the edge of many lakes and wetlands.

A long road before success

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