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Clean Angling News
July 2013
Recent Research Provides New Perspectives
Two new research papers released this month provide a better understanding of how invaders may dominate natives.
Scientists who study invasion biology have long assumed that invasive species have some sort of "away-field" advantage that explains why they don't exhibit the same invasive characteristics in their home ranges. The thinking has been that successful invaders do better in a new place because the environment is more hospitable to them. They escape their natural enemies, use novel weapons on unsuspecting natives and generally out compete natives on their own turf by disrupting the balance of nature in their new ecosystems. However, new research suggests that the key to a successful invasion depends less on the environment and more on the individual species doing the invading.  Read More
      In another groundbreaking study, researchers found that an invasive lady bug beetle actually eliminates native species because of a fungal spore they carry with them. In effect, they are practicing "biological warfare". Although most invaders don't succeed for this reason, North American crayfish have invaded Europe very successfully in part because they carried a disease that wiped out the locals.  Read More

Yellowstone National Park Addresses Invasives
Yellowstone National Park is one of the most pristine environments in North America. It's harsh climate and geographical isolation have helped to protect it from some of the worst invaders. However, Park managers are well aware that there is significant risk of Park waters being invaded. To help reduce the possibility of non-native introductions, Yellowstone has implemented new inspection requirements for boaters wanting to launch in the Park
.  Read More
      The waters of Yellowstone have long been home to several introduced non-native fishes. In particular, rainbow trout, brown trout and brook trout all have the capacity to impact on native cutthroat trout populations. With evidence that some of these non-native trout are spreading rapidly to the detriment of the natives, YNP officials have implemented strict new fishing regulations on selected waters that require anglers to harvest every non-native trout they catch.  Read More
       In a report that I find very interesting, Park biologists are linking declines in elk populations to the loss of cutthroat trout in Yellowstone Lake. Two invaders, lake trout and whirling disease, have combined to push populations of cutthroat trout to unprecedented low levels in Yellowstone Lake. This has led to a collapse of the huge cutthroat spawning runs that used to provide a major food source to the Park's robust grizzly bear populations. With the trout gone, the bears have shifted to preying on young elk.  Read More

Previously Posted On Facebook
     We review news stories on a daily basis and post stories of interest on Facebook as we find them. However, we know that many of you are not using Facebook so here are the links we posted during March on our Facebook pages.

     Our  Clean Angling Facebook page is where we post links that deal with fish & fishing, cleaning, boat inspections, and other issues of interest to anglers. 

AIS awareness has increased so much that syndicated cartoonists are referencing invasives in their comic strips

Non-native fish will be removed from Utah's Mill Creek to assist in the reintroduction of native Bonneville cutthroat trout.

The cost of controlling the spread of invasives has gotten much bigger for the oceanic shipping industry. New estimates are for $100 billion over 5 years for ballast water treatment

A professional angler has joined with a noted chef to promote invasive species awareness in Wisconsin.

Shad, an invasive fish in the Western US, reach high densities in many waters. They are not usually a good food fish but here is a tasty way to make shad tempura.

Didymo has now been found in Massachusetts. Authorities are cautioning the public to be aware after finding didymo in the Green River

A $20 per northern pike bounty is being offered to anglers on 

On our Invasive Species Action Network Facebook page we post all types of invasive species news including stories about all types of invaders, policy issues and other items of interest.

Asian tiger mosquitoes are becoming a well established invader. They are likely spreading on old tires that are being moved around the country

Long considered to be one of the West's worst invasive weeds, new research shows that, when baled, Russian knapweed is a palatable and nutritious food for cattle

AIS awareness has increased to the point that syndicated cartoonists are making references in their strips. Too bad about the attitude about research!

A new invader, the African black slug has been found in Texas

The cost of controlling the spread of invasives has gotten much bigger for the oceanic shipping industry. New estimates are for $100 billion over 5 years for ballast water treatment 

Iguana Hunters Wanted! Fiji to pay a bounty for invasive iguanas and their eggs

More than 4,000 acres of Louisiana's Lake Bistineau are covered with Giant Slavinia, an invasive floating plant. Officials are drawing down the lake in hopes of reducing the weeds.

In Lake Powell, a serious effort is underway to better understand the recent Quagga mussel invasion. As many as 30 divers are working together on the project. 

PBS Kids has a great video about the forest pest threat. Part of the Wild Kratts video series, the video combines animation and live action and is great for all kids (and adults too!)

Researchers are investigating the link between invasion by cheatgrass and the loss of raptors - especially golden eagles

A Wisconsin man is getting lots of attention for his business of renting goats to control invasive weeds.!

A Chinese firm has announced plans to harvest, process and export up to 10,00 Asian carp a day from US waters! 

In North Carolina the first "If You Can't Beat em, Eat em Spearfishing Tournament" has kicked off.

July 2013

  The end of June has seen record high temperatures in many areas of the West. Temperatures above 110 degrees have it many areas and I can't help but worry about the boat inspection crews who are out in the heat working to protect our waters. There is nothing exciting about working an inspection crew and to be out in this heat is really a challenge. Please join me in expressing thanks to everyone who is doing this important work!

   This is the field season for many invasive species projects. Whether it is research, control or outreach, this is the time of year when much of the hands-on work takes place. I have not been covering most of the boat inspection stories that have come out. I'm sure you all realize that inspections are now common in many places and it seems to be working. There have been far fewer new AIS discoveries in recent years and I credit boat inspections and the attendent publicity for much of this success.

     I hope you all remember that this is the time of year to get out on the water and enjoy the fantastic resources that we are all woring to protect. Please make sure to take time this summer to enjoy our waters!

   As always, we are interested in any invasive species story you know of so be sure to get in touch if you have a story to tell.

Bob Wiltshire
Executive Director ISAN

  Please send comments, questions and complaints to newsletter@stopans.org.

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The Clean Angling News is regularly produced by the Invasive Species Action Network. If you have questions, suggestions or would like to learn more about invasive species please contact us:

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