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Action Alert: Your help is needed for Swan Lake

Swan Lake, Montana

Wild trout need your help. Montana FWP, Region 1, has released for public comment a draft environmental assessment for extension of the unique restoration effort for Swan Lake and the connected river system. Comments can be sent to FWP fisheries biologist Leo Rosenthal at; lrosenthal@mt.gov.

Following the discovery of invasive lake trout in Swan Lake in 1998 and impacts to native and nonnative fish populations, a three-year experimental suppression effort was initiated in 2009 to examine the potential for reducing the population of lake trout in Swan Lake to prevent the collapse of the popular kokanee salmon fishery and safeguard the population of federally protected native bull trout. Fishery scientists are in agreement that, if left unchecked, lake trout will wipe out the kokanee and native fish populations in the entire watershed.

Montana law requires FWP to manage endangered or threatened species “in a manner that assists in the maintenance or recovery of those species.” We have seen a more than 50% decline in native bull trout in the Swan Lake population in the last decade and more than 50% decline in fishing pressure for other sport fish in the lake. In 2012, FWP instituted a catch-and-release regulation for bull trout in Swan Lake.

While the three-year experimental program has shown promising results, it will take more time to evaluate the effectiveness of the netting program due to the lag between lake trout removal and evidence of revived bull trout spawning. The experimental netting has shown reduced numbers of lake trout in the nets as well as a shift in the size and age of the spawning lake trout population. Both of these indices are positive results showing the effectiveness of the netting. Bycatch of protected fish has been lower than expected during the 3-year period and 60% of all captured bull trout were released alive.

If the program is halted now, we will lose much of the science and information gained on the feasibility of the lake trout control methods being used. We must allow this effort to play out for a long enough period to determine how well these methods work and if they can be effective in other impacted waters.
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Flathead Valley Trout Unlimited is in full support of Alternative B: Continued Removal of Subadult and Adult Lake Trout. The proposal in the EA will continue the present effort for another five years in the same manner used during the experimental period. An estimated 5,000 to 10,000 lake trout will be removed each year. Removed lake trout will continue to be donated to local food banks so, no fish will be wasted. Scientific monitoring of kokanee and bull trout populations will continue and impacts of the program on all fish species closely monitored.

We urge your continued support of this worthy project. Your comments will be very helpful in supporting this valuable effort and assisting fishery managers. You can review the full Environmental Analysis at the FWP website,  http://fwp.mt.gov/news/newsReleases/fishAndWildlife/nr_0389.html

Please send your comments to MFWP project leader, Leo Rosenthal at; lrosenthal@mt.gov