Most fishing regulations exist to tell anglers when to stop. A good share of Montana's next rulebook does the opposite. When the Montana Fish and Wildlife Commission met on October 14, it approved 44 changes to the state's fishing regulations for the 2027-2028 cycle, and several of the most consequential ones remove limits rather than set them. On Flathead Lake, daily and possession limits for northern pike, smallmouth bass and rainbow trout are set to disappear. In much of the Flathead drainage, any brown trout an angler hooks will have to be killed and reported.
The logic behind both moves is the same. These are non-native fish, and in northwest Montana the state's priority is the native bull trout and westslope cutthroat that evolved there. The commission adopted the full package unanimously after nearly a year of scoping and public comment by Montana Fish, Wildlife and Parks, according to the Flathead Beacon, with the Daily Inter Lake reporting that the new rules expand angling for non-native species while reshaping standards aimed at protecting bull trout.
Flathead Lake Loses Its Daily Limits on Three Species
Under the rules FWP brought to the commission, northern pike, smallmouth bass and rainbow trout on Flathead Lake will no longer carry daily or possession limits. Possession limits for lake trout in the Western District are also eliminated.
On paper, that sounds like an open invitation to fill coolers. In practice, state managers do not expect a dramatic change on the water. The Daily Inter Lake reported that the move is partly meant to simplify regulations on a lake that is managed cooperatively, and that few anglers would exceed the current daily harvest limits anyway. Flathead Lake straddles the Flathead Indian Reservation, and its southern half falls under the Confederated Salish and Kootenai Tribes, so aligning rules across the lake has long been a practical headache for anglers who cross the line without knowing it.
The bigger significance is the message. FWP's rationale treats lake trout and the other introduced predators as competitors with bull trout, a species listed as threatened under the Endangered Species Act. FWP's earlier proposal document noted that lake trout have altered the abundance and size structure of native and sport fish populations, especially in western Montana. Liberalizing harvest is a way of enlisting anglers in suppression work without spending more public money on netting.
The lake trout question that did not go away
Not everyone on the Flathead is on board. During public comment, anglers objected that the push toward liberal harvest of lake trout and illegally introduced fish would cut into angling opportunity. Lake trout, or mackinaw, are the backbone of a popular fishery on Flathead Lake, and some anglers argue that the rules tilt too far toward native trout at the expense of the sport fish that draw people to the water.
That tension surfaced at the meeting through Commissioner Ian Wargo, who represents Region 1 in northwest Montana. Wargo brought four amendments. His fourth would have overruled FWP and kept more conservative harvest limits in place. He withdrew it and deferred to the department, using the moment instead to press staff for a clearer picture of where management of the lake is headed.
"This is a request, specifically to the Department, to have a broader discussion on where we're going with management on Flathead lake," Wargo said.
He pointed to the Mack Days fishing contests, which have paid anglers to catch lake trout for more than 20 years as a suppression effort, and noted that bull trout redd counts have stayed static. The implication was hard to miss: years of incentivized harvest have not visibly moved the needle on the fish the effort was meant to help.
Adam Strainer, administrator of FWP's fisheries division, said the department's preliminary plans include annual meetings with local stakeholders and an online resource tracking population trends and the effects of management. "We're committed to a better understanding of the recreational fishing component of the lake," Strainer said.
Kill and Report: The New Rule for Flathead Brown Trout
The sharpest change has nothing to do with lake trout. The commission unanimously adopted a catch-and-kill order for brown trout in Flathead Lake and the waters upstream of it. Anglers who catch a brown trout there must kill it immediately and report it. The rule will be written into the 2027-2028 regulations, and the Daily Inter Lake reported that the commission approved it as an emergency catch-kill-report rule for the Flathead drainage upstream of Seli'š Ksanka Qlispe' Dam, the structure formerly known as Kerr Dam.
Brown trout are a prized sport fish across much of Montana, including famous water on the Madison, Beaverhead and Missouri. In the Flathead, though, they do not belong. Over the past two years, reports have turned up brown trout in Ashley Lake, the Flathead River and Church Slough. The rule's rationale is blunt: "These brown trout are the result of illegal introductions and pose a real threat to sport and native fish."
Commissioner Vern Gagnon, who moved to approve the order, added a floor amendment that eases the burden on anglers. Rather than having to haul a carcass to an FWP office, an angler can either deliver the whole fish or contact FWP staff to arrange a possible transfer. For biologists, the fish themselves are valuable. A carcass can tell them age, origin and whether a population is reproducing, information that shapes how hard and how fast the state responds.
Why illegal introductions get this treatment
Montana has fought "bucket biology," the illegal moving of fish from one water to another, for decades. Northern pike, walleye and other species have shown up in waters where they were never stocked, often with lasting damage to native fish. The state has a rule framework that lets FWP respond to an illegal introduction by removing fish or loosening angling limits, and in 2015 the commission ordered a mandatory kill on walleye in the Swan Lake drainage. The brown trout order follows that playbook: catch the problem while the population is small, and use anglers as an early-warning network.
Bull Trout Rules on the South Fork and Hungry Horse
Not every change in the package loosens things. Two of Wargo's amendments passed, and both lean protective. One moves the regulation boundary between Hungry Horse Reservoir and the South Fork Flathead River to Peters Creek Campground, prohibits live and dead bait, and extends the bull trout catch-and-release season so that it starts on the third Saturday in May.
Those waters have been a focus for bull trout managers for several years. The South Fork and its tributaries saw record-low redd counts earlier in the decade, and the commission tightened rules there for the 2025 season. FWP's 2027-2028 scoping document had proposed limiting Hungry Horse anglers to one bull trout per license year, with a 28-inch minimum to keep a fish, and the department also advocated for a ban on live or dead bait in the Flathead River, except for maggots.
Two of Wargo's other amendments failed: one would have kept kokanee daily and possession limits on Little Bitterroot Lake, and another would have allowed double and treble hooks on the Flathead River while prohibiting dead bait there.
Beyond the Flathead: Billings and the Madison
The meeting reached across the state. Commissioner Gagnon won approval of an amendment removing a proposal that would have reduced the number of setlines allowed on the Yellowstone River from the Interstate 90 bridge in Billings to the mouth of the Bighorn River, a stretch where setline fishing for catfish and ling has a loyal following.
A last-minute amendment from Commissioner K.C. Walsh, aimed at reducing angling pressure on the Madison River, was rejected. Walsh, who represents Region 4, had introduced a proposal ahead of the meeting that would have required catch-and-release trout fishing from Yellowstone National Park to the Jefferson River and prohibited fishing from boats on certain stretches near Ennis. The Madison is among the most heavily fished trout rivers in the country, and crowding on it has been a running fight among guides, outfitters and local anglers for years. That fight will carry into the next cycle.
What It Means for Anglers Planning a 2027 Trip
For the visiting angler, the changes are mostly good news. Flathead Lake becomes simpler to fish, with fewer numbers to remember and more freedom to keep pike, bass and rainbows. Anyone who has trolled for mackinaw there will find the possession rules looser, too.
The adjustments are elsewhere. Anglers who catch a brown trout anywhere in the Flathead system above the dam need to know that release is no longer an option, and should know how to contact FWP to report it. Those fishing for bull trout in Hungry Horse or the South Fork should read the new boundaries and bait rules before the season opens, because the line between legal and illegal now sits at Peters Creek Campground.
The broader shift is worth noticing, even for anglers who never cast a line in northwest Montana. Western fisheries agencies are increasingly treating harvest of non-native fish as a conservation tool rather than a privilege to be rationed. Montana's new rules make the state's position clear: on the Flathead, the fish worth protecting are the ones that were there first, and everything else is fair game.
The 2027-2028 regulations will be published by FWP ahead of the 2027 season.
