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Entries in invasive species (187)

Tuesday
Sep172013

Duke Energy Develops Effective Strategy for Hydrilla Control

For years, resource managers have struggled to find a cost-effective and efficient way to control hydrilla. Mass application of herbicide can be cost prohibitive, as well as unpopular with anglers, environmentalists, and lakefront property owners. Grass carp, meanwhile, need years to bring the fast-growing exotic plant under control, unless they are stocked at exceptionally high rates, which also can be unpopular and expensive.

But Duke Energy Corporation has developed an effective management strategy for five of its Piedmont reservoirs that incorporates moderate use of both herbicides and carp. This reduces cost, as well as minimizes the likelihood of the adverse effects on fisheries that often accompany heavy stocking of grass carp.

This one-two punch, however, is not the sole reason for success, according to Ken Manuel, Duke’s reservoir aquatic plant manager.

“Early detection and rapid response is critical,” he said. “The plants grow so fast that you’re quickly past just a small infestation.

“Hydrilla grows faster than you think,” Manuel added. “It’s not just an inch a day. A plan can grow multiple feet per day from all of its growth tips.”

And too often, it’s spreading undetected. “Especially in the East, the states, which manage the fisheries and the water quality, rely on interested individuals to tell them about invasive plants,” the scientist said.

By contrast, Duke Energy’s mosquito control teams aren’t just controlling blood-sucking insects while they are on the water full-time for six months annually. “They are constantly looking for hydrilla and other invasive plants so that we can act quickly,” Manuel said.

Once hydrilla is confirmed, it is treated with herbicide. Sometimes, that is enough. More often it is not. That being the case, stocking of triploid grass carp follows, at a rate of 20 per acre of surface infestation.

The herbicide reduces the plant’s biomass, while carp graze on what sprouts from the surviving tubers. “If you have 1,000 acres of hydrilla, you have 1,000 acres until the tuber bank is exhausted,” said the scientist.

Additional “maintenance” stockings at a rate of 1 per 8 acres of the reservoir might follow for 8 to 10 years. 

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

Wednesday
Sep112013

Take a Bite Out of Carp Invasion

Okay, enough is enough.

 

Chef Philippe Parola wants us to east more Asian carp.

Down in Louisiana, fear of flying carp is keeping froggers out of the bayous at night.

On Lake Tunica in northern Mississippi, a woman sustained a broken collarbone when she collided with a barrage of silver carp while tubing.

In reporting on the latter, the Natural Resources Defense Council said:

“Despite somewhat sensational coverage that implied she was attacked, she wasn’t. The fish were doing what comes naturally when startled.

“Her experience is, sadly, not unique. Vast stretches of our waterways are being eliminated from recreational use by the carp’s presence. Folks in places like Peoria, Illinois, have long since abandoned recreational activity on the Illinois River for fear of similar incidents.”

The feds aren’t going to solve this problem. In fact, silver and bighead carp eventually will make their way into the Great Lakes and possibly devastate the sport fishery there because of politics and bureaucratic incompetence.

As with most everything else, the best means of dealing with this expanding invasion is private initiative. Or, as Gary Tilyou, Louisiana Inland Fisheries administrator advises: “When one jumps in your boat, eat it.”

And Tilyou is not the only one in Louisiana recommending that solution, which, admittedly, will require considerable corn meal.

“The Asian carp is not just a Great Lake problem,” says Chef Philippe Parola. “Our solution is to break down these delicious invasive fish and mass produce precooked boneless fish fillets for U.S. grocery stores and restaurants.

“This solution will immediately and rapidly remove these invasive fish from our waters.”

He adds that commercial harvest of silver and bighead carp will create jobs, boost local economies, “and offer a much cleaner, domestic fish. To date, more than 85 percent of U.S. fish consumption is imported and the majority of these imported fish are contaminated with pollutants or abused with overdoses of sodium for preservation and weight purpose.”

Also a recreational angler, Parola is at the forefront of a movement that seeks to control carp, lionfish, wild hogs, and other invasives by popularizing them as food.  As global commerce and increased mobility have accelerated these invasions in recent years, this campaign seems as likely as any government intervention to take a bite out of the problem.

Especially if anglers and others will give carp a chance.

“The meat is white. I’ve eaten it numerous times,” says Tilyou. “It’s not common carp. That’s a different fish.”

Parola adds, “The taste is a cross between scallops and crab meat.”

Besides buying “silverfin” at the markets and restaurants when it becomes available, anglers can help in other ways. The most obvious way is to keep carp when they jump in the boat, as Tilyou suggests.

But snagging and bowfishing tournaments also can reduce populations and put food on the table. And, the field is wide open for figuring out ways to get these filter feeders to bite on baits.

To find out more about eating invasive carp, check out Chef Parola’s web site at www.chefphilippe.com.

He is quick to advise that the carp should be bled as quickly as possible to improve the taste and he acknowledges that bones are abundant. That’s why he has focused on marketing items such as gumbo, cream bisque, and fish balls and cakes, as opposed to raw fillets.

Also, you can learn about lionfish from Maurice “Mojo” White in the Bahamas. At his www.lionfishhunter.com site, he will tell you how to safely handle and prepare this invader with toxin-tipped fins. In recent years, it has spread throughout the Caribbean and up the East Coast as far as Long Island.

Following are recipes developed by Parola for “silverfin”:

Silverfin fried strips. 4 servings

16 strips of silverfin fish (boneless if possible)

2 eggs

1 cup of Kleinpeter half & half for eggwash

1 cup of Louisiana fish fry seasoned flour

Peckapepper mango sauce for dipping

Preheat fryer at 350. In a bowl, crack 2 eggs, stir well, and then add half & half. Stir well again. Place the strips in eggwash.  Coat each strip with seasoned flour. Fry until done. Serve with mango sauce.

 

Silverfin cakes. 4 servings

1 pound of silverfin white meat

4 ounces of melted unsalted butter

1 tablespoon of Dijon mustard

1 tablespoon of lemon juice

1 whole egg

1 ounce of crumbled bread

Seasoning and hot sauce to taste

Poach or steam silverfin meat until fully cooked.  Break it up in pieces to remove bones. Place the meat in a mixing bowl. Add butter, mustard, egg, and lemon juice. Mix well and add crumbled bread. Season to taste. Make small cakes, roll in egg wash and seasoned flour, and then fry.

Laissez les bons temps rouler!

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

Tuesday
Sep102013

Separation Still Not Considered an Option for Keeping Carp out of Great Lakes

The latest manifestation of a strategy by the federal government to keep Asian carp out of the Great Lakes carries a $50 million price tag but still no mention of separating the lakes from the Mississippi River basin.

That omission does not please a growing number of stakeholders who believe that the only way to keep the exotics from destroying Great Lakes fisheries is by eliminating the manmade connection between the two watersheds.

“I think we could take carp control more seriously by disconnecting the Chicago waterway,” said Jim Diana, director of Michigan Sea Grant and a fisheries professor at the University of Michigan. “In absence of that, we’ll have all these kinds of temporary solutions that might work.”

And just a few months ago, Illinois Gov. Pat Quinn said, “Ultimately, I think we have to separate the basins. I really feel that is the ultimate solution. We have to do it.”

Until that announcement at a meeting of Great Lakes governors, most thought that Illinois would continue to side with Chicago and the Obama administration in opposing disconnection of the waterways.

Although it doesn’t include separation, the new 2013 Asian Carp Control Strategy Framework does call for an improved electric barrier south of Chicago, as well as creation of barriers at other tributaries feeding the lakes, nearly two dozen of which have been identified as potential entry points. It also calls for expanded sampling and emphasizes testing of new tools, including water guns, netting, chemical controls, and pheromone attractants.

“This strategy continues our aggressive effort to bolster our tools to keep Asian carp out of the Great Lakes, while we work toward a long-term solution,” said John Goss of the White House Council on Environmental quality, who oversees the initiative.

“The 2013 framework will strengthen our defenses against Asian carp and more innovative carp control projects from research to field trials to implementation.”

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

Friday
Aug232013

Invasive Species Spread Through Ignorance, Negligence

This article in the Crookston Times sadly illustrates how public ignorance and negligence spread invasive species that threaten our waterways and fisheries: 

Bemidji, Minn.  —  A watercraft inspector discovered zebra mussels and Eurasian watermilfoil on a boat trailer exiting Lake Bemidji this month, though they didn't originate here.

The zebra mussels and watermilfoil appeared to be dried and dead, said Henry Drewes,  Minnesota Department of Natural Resources regional fisheries manager. He said if that's the case, DNR officials wouldn't expect the incident to result in an infestation, something that Beltrami County has thus far been able to avoid.

"What it tells you, though, is that boats coming from infested waters, despite all the publicity, people are still not being vigilant enough about cleaning their watercraft before they move them," Drewes said.

The boat discovered Aug. 2 had recently been in the Twin Cities in Lake Minnetonka, one of the most infested waters in Minnesota. The boaters were from North Dakota.

"I think it also illustrates the mobility of people and their equipment," Drewes added.

The boaters cleaned the boat and were issued a $500 fine.

Friday
Aug232013

Taxidermist Mounts New Attack on Asian Carp

Taxidermist Mike Pusateri joined the battle against Asian carp when he was approached by Mike Matta, a charter captain. At an upcoming event, Matta thought that more than photos and videos were needed to drive home the threat that these invaders pose to native fisheries in the Great Lakes and other waters.

“They wanted something with impact, something physical in three dimensions to show people exactly what they were talking about with these fish,” Pusateri said. “I had never done a mount of an Asian carp – I’m not sure anyone had ever done one – but it seemed like something that was really important.”

And that proved to be the case. Pusateri since has done carp mounts for EPA, the Army Corps of Engineers, and Sea Grant organizations, as well as many universities and state agencies.

“Maybe I became a bit of a celebrity at the taxidermy conventions, but I’m just hoping my work will help combat the problem,” Pusateri said. “When I talk to the fisheries guys, they seemed stumped by this problem, and kind of scared by it. They say these fish eat so much that the other species just die out.”

Read more here.