Yellowstone River Closure: UPDATE!
The Yellowstone river suffered a significant loss of Mountain Whitefish in certain sections but the over all impact of PDK appears to have been minimal. Very few trout (really almost none) were killed by the disease and fishing on the river was reopened after a relatively short period of closure. Most anglers reported normal fishing trough the remainder of the fall.
Yellowstone River Closure
On August 19th Montana Fish Wildlife and Parks made the unprecedented move to close the entire trout fishing section of the Yellowstone River to any kind of water based recreation, including fishing. Consequently, we will not be offering trips on the Yellowstone River for the remainder of 2016. The closure is in response to a high number of dead Mountain Whitefish in the river. At first it was suspected that the fish kill was the result of record low flows and abnormally hot water conditions but recently biologist discovered that the true cause is a disease called PDK (proliferative kidney disease). PDK is a parasite that is capable of seriously damaging fish populations with 20-100% mortality rates. The Yellowstone closure is largely aimed at protecting the river and preventing PDK from spreading to other Montana fisheries like the Madison River. Since the closure, several mandatory boat cleaning stations have been positioned near Bozeman and Ennis to ensure that anglers and guides traveling from the Yellowstone to the Madison are not spreading the disease. Soon after the closure Montana FWP surveyed a relatively short section of the Yellowstone river (the right bank from Grey Owl FAS to Loch Leven FAS) to see the extent of the fish kill. They discovered 1895 Mountain Whitefish, 13 Longnose Suckers and only 1 Rainbow Trout. For now it seems that the disease is more or less just affecting the Mountain Whitefish population. Currently there is no evidence that the disease is present in the Madison River or other area fisheries. Hopefully the effects of PDK will be limited and the Yellowstone River will be fishing well again next summer...with a few less Whitefish. For now it is extremely important that anyone who has fished the Yellowstone River throughly clean their boats and gear to prevent the spread of PDK to other Montana fisheries.
Yellowstone River Closure - Press Release
(Bozeman, Mont.)--Montana Fish, Wildlife and Parks is implementing an immediate closure of all water-based recreation (fishing, wading, floating, tubing, boating, etc.) on the Yellowstone River and its tributaries from Yellowstone National Park’s northern boundary at Gardiner to the Highway 212 bridge in Laurel. This significant action on the part of the Department is in response to the ongoing and unprecedented fish kill on the Yellowstone. This action is necessary to protect the fishery and the economy it sustains. The closure will also help limit the spread of the parasite to adjacent rivers through boats, tubes, waders and other human contact and minimize further mortality in all fish species.
In the past week, FWP has documented over 2,000 dead Mountain Whitefish on some affected stretches of the Yellowstone. With that, FWP estimates the total impact to Mountain Whitefish in the Yellowstone to be in the tens of thousands. FWP has also recently received reports of the kill beginning to affect some Rainbow and Yellowstone Cutthroat Trout.
Test results from samples sent to the U.S. and Wildlife Service Fish Health Center in Bozeman show the catalyst for this fish kill to be Proliferative Kidney Disease – one of the most serious diseases to impact whitefish and trout. The disease, caused by a microscopic parasite, is known to occur in Canada, the U.S. and Europe. It has been documented previously in only two isolated locations in Montana over the past 20 years. Recent outbreaks have occurred in Washington, Oregon and Idaho. In trout, research has shown this disease to have the potential to cause 20 to 100 percent mortality. The parasite does not pose a risk to humans.
The effect of the disease on Yellowstone’s fish populations is exacerbated by other stressors like near record low flows, consistent high temperatures, and the disturbance caused by recreational activities.
FWP Director Jeff Hagener says in coming to the decision, the Department had to weigh the totality of the circumstances and risk to the fishery.
“We recognize that this decision will have a significant impact on many people. However, we must act to protect this public resource for present and future generations,” said Hagener.
"A threat to the health of Montana's fish populations is a threat to Montana's entire outdoor economy and the tens of thousands of jobs it sustains," said Gov. Steve Bullock, noting that Montana's outdoor recreation economy is responsible for more than 64,000 Montana jobs and nearly $6 billion in yearly economic activity. "We must be guided by science. Our state cannot afford this infectious disease to spread to other streams and rivers and it's my responsibility to do everything we can to stop this threat in its tracks and protect Montana jobs and livelihoods."
FWP will continue to monitor the river and will lift the closure when stream conditions such as flow and temperature improve and fish mortality ceases.
FWP staff will be available to the media Friday, Aug. 19 at 11 a.m. at Region 3 Headquarters in Bozeman (1400 S. 19th Ave.) to help answer questions related to the fish kill and this management action.
In addition to the closure on the Yellowstone, FWP is asking for the public’s assistance in preventing the spread of this parasite by properly cleaning (CLEAN.DRAIN.DRY) all equipment prior to moving between waterbodies (i.e., boats, waders, trailers). FWP has also set up two Aquatic Invasive Species decontamination stations set up along I-90 near the affected area in an effort to help reduce the chance of this parasite moving to other rivers.
In the past week, FWP has documented over 2,000 dead Mountain Whitefish on some affected stretches of the Yellowstone. With that, FWP estimates the total impact to Mountain Whitefish in the Yellowstone to be in the tens of thousands. FWP has also recently received reports of the kill beginning to affect some Rainbow and Yellowstone Cutthroat Trout.
Test results from samples sent to the U.S. and Wildlife Service Fish Health Center in Bozeman show the catalyst for this fish kill to be Proliferative Kidney Disease – one of the most serious diseases to impact whitefish and trout. The disease, caused by a microscopic parasite, is known to occur in Canada, the U.S. and Europe. It has been documented previously in only two isolated locations in Montana over the past 20 years. Recent outbreaks have occurred in Washington, Oregon and Idaho. In trout, research has shown this disease to have the potential to cause 20 to 100 percent mortality. The parasite does not pose a risk to humans.
The effect of the disease on Yellowstone’s fish populations is exacerbated by other stressors like near record low flows, consistent high temperatures, and the disturbance caused by recreational activities.
FWP Director Jeff Hagener says in coming to the decision, the Department had to weigh the totality of the circumstances and risk to the fishery.
“We recognize that this decision will have a significant impact on many people. However, we must act to protect this public resource for present and future generations,” said Hagener.
"A threat to the health of Montana's fish populations is a threat to Montana's entire outdoor economy and the tens of thousands of jobs it sustains," said Gov. Steve Bullock, noting that Montana's outdoor recreation economy is responsible for more than 64,000 Montana jobs and nearly $6 billion in yearly economic activity. "We must be guided by science. Our state cannot afford this infectious disease to spread to other streams and rivers and it's my responsibility to do everything we can to stop this threat in its tracks and protect Montana jobs and livelihoods."
FWP will continue to monitor the river and will lift the closure when stream conditions such as flow and temperature improve and fish mortality ceases.
FWP staff will be available to the media Friday, Aug. 19 at 11 a.m. at Region 3 Headquarters in Bozeman (1400 S. 19th Ave.) to help answer questions related to the fish kill and this management action.
In addition to the closure on the Yellowstone, FWP is asking for the public’s assistance in preventing the spread of this parasite by properly cleaning (CLEAN.DRAIN.DRY) all equipment prior to moving between waterbodies (i.e., boats, waders, trailers). FWP has also set up two Aquatic Invasive Species decontamination stations set up along I-90 near the affected area in an effort to help reduce the chance of this parasite moving to other rivers.
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