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Invasive mussel larvae found in Green Mountain Reservoir

Post By: RoyR      Posted: 8/29/2017 9:15:09 AM     Points: 3344    
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 Reply by: sickws6      Posted: 8/29/2017 9:21:45 AM     Points: 574
it says they think it was an out of state boater... Thoughts on if they heard about the pike bounty there?? I had a gut feeling GMR was going to see an invasive species in the lake this year
 Reply by: RoyR      Posted: 8/29/2017 9:31:21 AM     Points: 3344
I can't understand how a lake is cleaned from these mussels after its contaminated?
 Reply by: sickws6      Posted: 8/29/2017 9:35:55 AM     Points: 574
RoyR, I don't think that is possible but im not in that line of work, I know they can put perimeter's up around inlet and out let pipes that's where they like to hang out
 Reply by: shiverfix      Posted: 8/29/2017 9:47:29 AM     Points: 3900
I don't mean to start the debate again, and I am not going to debate lake inspections, but I am more and more in favor of inspecting boats as they come in the state. Wyoming and Idaho do this.
 Reply by: EasyWR450rider      Posted: 8/29/2017 10:00:23 AM     Points: 29
Agreed, David! Makes more sense and would "trim the fat" so to speak on this program. Saving us all a lot of money and hassle.
 Reply by: twhart      Posted: 8/29/2017 10:14:33 AM     Points: 473
RoyR, I wondered that myself and asked that very question when I recertified in Wyoming to be a private AIS inspector to save myself some hassle when I fish in that state. Until this recent Green Mountain Reservoir finding, CO had become a "clean" state again. The mussels never took hold in Jumbo, Pueblo, and other lakes where they were found at one time. They said it is probably due to the cold water temperatures here preventing them from surviving and reproducing. Let's hope that is how it turns out for GMR.
 Reply by: sickws6      Posted: 8/29/2017 10:28:03 AM     Points: 574
Shiver, I don't like that idea, take Hattie for example, if I want to launch, I could come up dead man or Laramie river road and Wyoming would never have the chance to inspect my boat, and yes I do go up Laramie river road at times coming back from stagecoach with my boat in tow. also I don't like having to stop at the border of Wyoming to have my Boat inspected when I am not launching there and just passing thru to launch at Merritt.... Just some thought on it
 Reply by: EasyWR450rider      Posted: 8/29/2017 10:45:17 AM     Points: 29
These mussels have a hard time going from veligers to adults due to environmental factors such as low calcium concentrations in our mtn lakes.

The CDOW will say their efforts largely keep these particular species from spreading. That's not exactly 100% true. Their efforts can help but environmental factors help keep them from spreading much more.

The below is a thesis written by a CU master's student. She cites studies by Drake & Bossenbroek, 2004, among others, conducted to prove that Dreissena have an extremely low likelihood of taking hold in Rocky mtn waters. Colorado's east plains reservoirs are more suitable for veligers to mature to adulthood but still not as suitable as midwestern and eastern lakes.

The extremely detailed thesis about the economic impact of prevention vs eradication(treatment) is found here: [log in for link]

One paragraph that quickly sums up the studies' details: Environmental Factors Affecting Mussel Spread

Levels of calcium, pH, alkalinity, temperature, dissolved oxygen, Secchi depth, nutrients, and available substrate have all been found to be important predictors of dreissena habitat suitability (Ramcharan et al., 1992 Mellina & Rasmussen, 1994 Cohen & Weinstein, 2001 Drake & Bossenbroek, 2004 Whittier et al., 2008 Claudi & Prescott, 2009). Several studies address the possible spread of dreissena based solely on environmental factors.

In 2004, Drake and Bossenbroek developed a model to predict the potential distribution of zebra mussels in the United States using biological and geological variables including average annual temperature, bedrock geology, elevation, flow accumulation, frost frequency, max and min temperatures, precipitation, slope, solar radiation, and surface geology. Of particular interest to this study are Drake and Bossenbroek's predictions for the Rocky Mountain region. Two of the three models developed by Drake and Bossenbroek (2004) predict that zebra mussels will not spread to the Rocky Mountain region. The third model, which includes all of the listed variables with the exception of the elevation variable, predicts the Eastern Plains of Colorado to be at high risk of mussel infestation, but still predicts the mountainous regions of the state to have very low probabilities of infestation. At the time these models were developed, the third model was deemed the least reliable of the three, and the consensus was that the Rocky Mountain States were very unlikely candidates for mussel infestation.

Whittier et al. (2008 ) use calcium concentrations to assess the risk of dreissena invasions for ecoregions across the contiguous U.S. Using calcium concentration data from over 3000 stream and river sites across the nation, they define risk of dreissena invasion based on calcium concentration. Ecoregions with average calcium concentrations below 12 mg/L are defined as very low risk, 12-20 mg/L as low risk, 20-28 mg/L as moderate risk, and greater than 28 mg/L as high risk. In their assessment, the Eastern Plains of Colorado have a high risk of dreissena invasion based on calcium concentration, and the risks to the mountainous regions of the state are highly variable.
 Reply by: RoyR      Posted: 8/29/2017 11:41:45 AM     Points: 3344
450, that is a good read and makes sense. Other than putting some kind of chemical in the lakes I can't see any other way to get rid of them. I'll do my part and remove some calcium from the lakes I fish.
 Reply by: EasyWR450rider      Posted: 8/29/2017 12:19:37 PM     Points: 29
This biologist has the answer currently at a very high cost: [log in for link]

Pseudomonas fluorescens(bacteria) was proved to be lethal to Dreissena.

[log in for link]

We all need to do our part by keeping our boats CLEAN, DRAIN, and DRY.

Thanks for doing your part RoyR! Take some fish bones home, eh?
 Reply by: RoyR      Posted: 8/29/2017 12:31:32 PM     Points: 3344
 Reply by: Ryan      Posted: 8/29/2017 5:53:53 PM     Points: 2781
It has been a number of years since I was at Green Mountain. So, did they have (and enforce) mandatory inspection before launch, or was it kind of an "honor system" where there weren't inspectors at the launch ramp?
 Reply by: RoyR      Posted: 8/29/2017 10:35:45 PM     Points: 3344
Inspectors have been at GM for a few years now for entrance inspections. Last time I was there I had the boat inspected on the way out too.
 Reply by: bratfish      Posted: 8/30/2017 8:26:33 AM     Points: 1099
you mean the half @$$ inspectors. lol 😆 who all have different info on how to interpret how to 'do their job' funny. more naive than funny, but funny.
 Reply by: sickws6      Posted: 8/30/2017 9:38:10 AM     Points: 574
My Dad has a pontoon and the best one ive heard from them and this was the port of entry in Cheyenne was "is your plug out?" I replied umm there is no plug.. He thought I was being a punk and demanded that I go pull the plug, I laughed at him and asked for his supervisor, his supervisor came out and told me I was free to go.... that guy probably got chewed lol

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