Trout & salmon · Freshwater
Cutthroat trout
Oncorhynchus clarkii
Interior and coastal cutthroat complex of western North America; subspecies differ.
Also called cutt, cutthroat, native trout, cuttbow.
- Flowing water
- Stillwater
- Ordinary target
- 4 of 4 overlays reviewed
- Reviewed 2026-08-27
Take this somewhere
This page is the record. The reading is what happens when you add water, a season and a temperature to it — that is where the families below get ranked against each other instead of just listed.
Those three links carry the fish and nothing else. No conditions were declared on this page, so none travel, and the link says so rather than sending an empty reading.
The half nobody publishes
What this record does not know
Everything else on this page comes from a named agency or peer-reviewed source. This is the other side of that: the questions a reviewer went looking for an answer to and came back without, and the fields the record leaves empty because filling them would mean guessing.
It is here rather than at the bottom because a page that only shows what it knows is easy to read as a page that knows everything. For Cutthroat trout there are 15 of them.
Named by a reviewer
13Somebody looked for this and wrote down that they did not find it.
- Behaviour
Citation gap: “State/tribal cutthroat status reviews” describes a source category rather than one resolvable document.
Nobody has sourced:
- cold-front / barometric response with primary-source support
- species-specific angling-pressure response beyond general cover/light notes
- subspecies-specific behavior table
- Identification
Citation gap: “State/tribal cutthroat status reviews” describes a source category rather than one resolvable document.
Nobody has sourced:
- a complete coastal-cutthroat versus steelhead juvenile key
- subspecies-by-subspecies size and longevity table
- Forage
Citation gap: “State/tribal cutthroat status reviews” describes a source category rather than one resolvable document.
Nobody has sourced:
- finer month-by-month diet inside a season, which is waterbody-specific
- strain-specific piscivory rates
- Season
Citation gap: “State/tribal cutthroat status reviews” describes a source category rather than one resolvable document.
Nobody has sourced:
- adfluvial vs resident calendars (RPC overlay)
- month-by-month location changes inside a season, which are waterbody-specific
Absent from the record
2No reviewer wrote a gap here. The field is simply empty, which is its own answer.
- Water temperature
No agency or peer-reviewed temperature band for Cutthroat trout was found that a review would accept. The reading runs without one rather than borrowing a number from a related fish.
- Identification
No reviewed image. A photograph is only in this catalog when an agency or a named creator labelled the subject, and nobody has cleared one for this species yet.
Where the record puts it
Water and range
Flowing water
6 reviewed holding classes- Run
- Seam
- Riffle-to-run transition
- Pool head
- Side channel
- Tributary mouth
Stillwater
5 reviewed holding classes- Inlet
- Outlet
- Drop-off
- Point
- Weed edge
DepthOften near drop-offs and inlets in lakes; mid-depth in rivers when feeding.
Moving waterModerate current and tributary-influenced water; less of a heavy-cover fish than brown trout.
LightDaytime feeding common; still uses shade on bright alpine water.
Thermal band
Temperature
No reviewed temperature band
Nobody publishes a preferred or active temperature range for Cutthroat trout that a review would accept. Borrowing one from a related fish would look like knowledge and behave like a guess, so the reading runs without it and says which parts of the answer that weakens.
How it uses water
Behaviour
Interior forms are often more insect-oriented and less competitive than sympatric rainbows where the two overlap.
Strong drift and surface-insect identity in many interior streams; lake forms also use zooplankton and baitfish. Do not assume a current hatch from diet capacity.
Daytime feeding is common; shade still matters on bright alpine water.
Seasonal activitySpring tributary movement is a biological context. Adfluvial versus resident behavior is an RPC question, not a GPS inference.
Temperature-driven behaviourSlightly cooler-leaning than many inland rainbows in the reviewed thermal bands. Warm, low-oxygen water is a hard constraint for some interior subspecies.
Depth movementNear drop-offs and inlets in lakes; mid-depth in rivers when feeding.
Facing the currentModerate current and tributary-influenced water; less of a heavy-cover fish than brown trout.
CoverSeams, runs, side channels, and tributary mouths more than undercut banks as a default.
Open waterAdfluvial fish use lake inlets, drop-offs, and points; this is not a river-only species.
Predator avoidanceUses depth, broken water, and, in lakes, the safety of open-water distance rather than heavy wood.
TerritoryHolds feeding water but is generally less aggressively hole-bound than brown trout.
Spawning (conservation context)Spring spawner; many interior forms move into tributaries. Subspecies and hybridization with rainbow trout are conservation constraints. Spawning reaches are never named.
Where the general rule stops
- Subspecies (Yellowstone, westslope, coastal, Lahontan) are not interchangeable; treat geographic limits as hard.
What it can eat
Forage
- Aquatic insects
- Emerging insects
- Terrestrial insects
- Crustaceans
- Small forage fish
- Zooplankton
Interior cutthroat are often more insect- and zooplankton-oriented than sympatric rainbows. Lake forms can still take fish. Do not treat that capacity as a current hatch.
- Feeding style
- Opportunistic
- Feeding zone
- Mixed
Through the year
- Winter
- Subsurface invertebrates in ice-influenced lakes and wintering stream habitat.
- Spring
- Insect drift and lake zooplankton as water warms. Tributary spawning is conservation context, not a diet event.
- Summer
- Terrestrials and aquatic insects in streams; zooplankton and baitfish possible in lakes.
- Fall
- Remaining insects and opportunistic fish or egg items where those foods exist. Not a prescribed forage event.
By life stage
- Young of year
- Zooplankton and tiny aquatic invertebrates.
- Juvenile
- Aquatic insects and crustaceans.
- Adult
- Insects remain central in many interior streams; lake adults may add fish.
Ontogenetic shiftWeaker piscivory than many rainbow populations at the same size in interior streams; lake adults may still shift toward fish.
SubstitutionsAlpine lakes may emphasize zooplankton; connected lakes can add forage fish. Stream diets stay insect-heavy unless sculpins or bait are abundant.
Diet capacity is not proof that a hatch or prey event is occurring. Observed current forage still comes from a user observation or Hatch Match.
Through the year
Season
Winter
- Where they sit
- Deeper lake basins, inlets, or stream wintering pools.
- Feeding
- Subsurface invertebrates.
What that changesDead-drift and suspended drift in flowing water; horizontal retrieve or trolling in lakes.
Spring
- Where they sit
- Tributary-influenced water, seams, and lake inlets.
- Movement
- Many interior forms move into tributaries. That movement is biology, not a pin.
What that changesDead-drift, swing, surface-drift, and suspended drift remain the reviewed flowing families.
What would count against it
- naming tributary mouths as secret staging
Spring spawner. Tributary spawning water is excluded from target guidance.
Summer
- Where they sit
- Moderate current, drop-offs, and shade on bright alpine water.
- Forage
- Terrestrials and aquatic insects in streams; zooplankton possible in lakes.
- Temperature
- Preferred 48–58°F; 68°F warm edge is a refuge problem.
What that changesSurface-drift is a reviewed option when terrestrials are observed, not assumed.
Fall
- Where they sit
- Lake drop-offs and stream feeding water as temperatures ease.
What that changesHorizontal retrieve and stop-and-go in lakes; drift families in rivers.
Spawning · Spring
Spring spawner; many interior forms move into tributaries.
Recorded as conservation context. No spawning site, staging concentration or migration bottleneck is named anywhere in this catalog, because naming one is how a population gets fished out.
Telling it apart
Identification
What to look at
- Red, pink, or orange slash on the inner fold of the lower jaw — the namesake cutthroat mark.
- Basibranchial teeth present at the base of the tongue in true cutthroat; a reliable internal check against rainbow.
- Maxillary typically extends beyond the posterior edge of the eye.
- Spots often larger and more posterior than on rainbow; many interior forms are lightly spotted on the anterior body.
- Subspecies (westslope, Yellowstone, coastal, Lahontan, and others) are not interchangeable; treat geography as a hard constraint.
- Average adult length
- Many interior stream adults 8–14 in; adfluvial and large-lake forms substantially larger.
- Common angling size
- 8–16 in in most interior streams.
- Typical weight
- Often under 1.5 lb in small interior streams; lake forms can weigh several pounds.
- Maximum documented
- Lahontan and some large-lake adfluvial fish historically reached trophy sizes far above typical interior stream fish. Subspecies must not share one maximum.
- Longevity
- Often 5–8 years in interior streams; large-lake forms can live longer.
What it gets confused with
- Rainbow trout
- Rainbows usually lack the jaw slash and basibranchial teeth, carry a stronger pink lateral band, and have more uniform spotting onto the tail. Hybrids are common where the two overlap.
- Bull trout
- Bull trout are char: light spots on a darker body, no cutthroat slash, white leading edges on the fins, and a conservation-sensitive catalog status.
What follows from all of that
Presentation families
Flowing water
Dead drift
Allow a food-form imitation to move at or near current speed through a defined feeding lane.
- controlled depth
- minimal drag
- short-to-medium presentation lane
- occasional repositioning
What it asks of the tackle
- Depth control
- High
- Sensitivity
- High
- Casting distance
- Short to moderate
- Weight range
- 1/64–1/8 oz or unweighted fly
- Cover resistance
- Low
- Line visibility
- Low
- Retie frequency
- Moderate
Swing
Let current carry a bait or fly across a lane so it broadens and lifts at the hang.
- downstream quartering
- controlled belly
- hang-down pause
- slow lift
What it asks of the tackle
- Depth control
- Moderate
- Sensitivity
- Moderate
- Casting distance
- Moderate
- Weight range
- Unweighted to 1/4 oz
- Cover resistance
- Low
- Line visibility
- Moderate
- Retie frequency
- Low
Suspended drift
Hold an imitation in the column, not on the bottom, while it moves with or slightly slower than the current.
- depth retention
- neutral or slow sink
- lane tracking
- minimal acceleration
What it asks of the tackle
- Depth control
- High
- Sensitivity
- High
- Casting distance
- Moderate
- Weight range
- 1/16–1/4 oz
- Cover resistance
- Low
- Line visibility
- Low
- Retie frequency
- Moderate
Surface drift
Present a floating food form in a feeding lane with as little drag as the water allows.
- slack management
- reach or mend
- dead or micro-twitch
- leave it in the lane
What it asks of the tackle
- Depth control
- Surface
- Sensitivity
- Moderate
- Casting distance
- Short to moderate
- Weight range
- Unweighted
- Cover resistance
- Low
- Line visibility
- Low
- Retie frequency
- Moderate
Stillwater
Horizontal retrieve
Move a swimming bait through a chosen depth band along structure or open water.
- count down
- steady or pulsing retrieve
- keep the band
- cover the edge
What it asks of the tackle
- Depth control
- Moderate
- Sensitivity
- Moderate
- Casting distance
- Moderate to long
- Weight range
- 1/8–1/2 oz
- Cover resistance
- Moderate
- Line visibility
- Low
- Retie frequency
- Low
Trolling
Cover a depth contour or basin at a controlled speed to intercept mobile fish.
- speed control
- depth control
- follow the contour
- turn to change action
What it asks of the tackle
- Depth control
- High
- Sensitivity
- Low
- Casting distance
- Boat
- Weight range
- Varies with speed and depth
- Cover resistance
- Low
- Line visibility
- Moderate
- Retie frequency
- Low
Stop-and-go
Imitate injured or hesitating prey by mixing travel with pauses that hold the bait in the strike zone.
- travel
- pause
- keep depth on the pause
- restart without jumping the band
What it asks of the tackle
- Depth control
- High
- Sensitivity
- High
- Casting distance
- Moderate
- Weight range
- 1/8–3/8 oz
- Cover resistance
- Moderate
- Line visibility
- Low
- Retie frequency
- Moderate
Surface retrieve
Work a floating bait across shade, weed edges, or low-light shallows.
- walk, pop, or crawl
- pause in holes
- keep it on top
- cover the edge
What it asks of the tackle
- Depth control
- Surface
- Sensitivity
- Low
- Casting distance
- Moderate
- Weight range
- 1/4–3/4 oz
- Cover resistance
- Moderate
- Line visibility
- Moderate
- Retie frequency
- Low
What moves them for this fish
Reviewed rules that push particular families up when the conditions match. Each one names the conditions it needs and why it exists, so you can disagree with it.
Cutthroat trout often remain willing daytime surface feeders when verified insect input is present.
When
Flowing water · Summer or Late summer · Emerging insects, Terrestrial insects
Moves up
Surface drift, Dead drift, Suspended drift
Reviewed 2026-08-27
Lake cutthroat commonly use water-exchange edges and adjacent depth transitions; reinforce mobile depth-control families.
When
Stillwater · Inlet, Outlet, Drop-off
Moves up
Horizontal retrieve, Trolling, Stop-and-go, Surface retrieve
Reviewed 2026-08-27
Not every population is the same fish
Regional population context
Interior resident / fluvial
- Resident or fluvial
- Native or conservation managed
- Flowing water
Use river drift lanes, seams, and connected coldwater habitat as the population frame; do not import lake-travel assumptions into a resident/fluvial declaration.
Westslope cutthroat trout can express resident, fluvial, and adfluvial life histories; this profile represents the river-resident/fluvial side of that split.
- Cutthroat subspecies and hybridization status remain basin-specific and must be verified separately.
- Spring spawning tributaries and migration bottlenecks are conservation context, not target layers.
Adfluvial / lake-connected
- Adfluvial
- Native or conservation managed
- Stillwater
Use lake depth edges, inlets/outlets, and mobile forage layers as the adult habitat frame while treating tributary spawning movement as protected context.
Adfluvial cutthroat migrate between lake habitat and spawning/rearing tributaries; adult lake behavior is distinct from resident stream fish.
- Do not infer a tributary or spawning destination from the adfluvial label.
- Subspecies, lake productivity, and hybridization can materially change this profile's fit.
Where every sentence came from
Sources
Agency
State/tribal cutthroat status reviews
Used for habitat, thermal band and presentation families. Read 2026-08-27, next check 2026-11-27.
Agency
U.S. Fish & Wildlife Service Westslope Cutthroat Trout profile
Used for population context. Read 2026-08-27.
Agency
Montana fisheries management plan cutthroat life-history summary
Used for population context. Read 2026-08-27.
Peer reviewed
Behnke Oncorhynchus clarkii systematics
Used for habitat, thermal band and presentation families; identification; behaviour; forage; season. Read 2026-08-30, next check 2026-11-27.
A source with no link predates the rule that one has to carry a URL. It is still a real citation and still checkable; it just takes a search rather than a click, and that is worth knowing before you rely on it.