target.species
Brook Trout
Salvelinus fontinalis
Small water, small fish, tiny tolerances. A tight brushy creek where a six-inch cast error is the difference between a fish and a snag.
Tolerances
Every field the compatibility engine reads for this species, with what the number actually controls. Change any component outside these windows in the studio and it raises a diagnostic against the value on this page.
| Field | Value | What it controls |
|---|---|---|
| weightLb | 0.2 – 2 lb | Typical caught weight, not the record. Sets how much the hook, knot, and drag actually have to hold on a normal day. |
| lineLb | 2 – 6 lb | Sane mainline test window. Under the low number you get broken off; over the high number you are paying in diameter, casting distance, and bites. |
| hookSize | #16 – #7 | Printed hook-size window on the unified scale. Matched to mouth and bait size — an oversized hook is the most common reason a fish never gets pinned. |
| leaderLb | 2 – 4 lb | Leader test window. Usually at or above mainline test, because the leader is the part that meets teeth, rock, and gill plates. |
| lineShy | 0.95 | How much a visible line costs you in bites, 0 to 1. Above roughly 0.6, a low-visibility fluorocarbon leader stops being optional in clear water. |
| abrasion | 0.15 | Teeth and habitat wear, 0 to 1. Above roughly 0.85 you are into wire-leader territory; in the middle you go heavier fluoro and check your last three feet after every fish. |
| minDragLb | 1 lb | The drag floor. A reel that cannot apply this much without stalling will get spooled or will pop the knot on the surge — the builder flags any reel under it. |
| depthBias | 0.40 | 0 is surface, 1 is hard bottom. Drives how much weight you need and whether a float, a bottom rig, or a topwater is the honest presentation. |
| structure | timber, rock | Where the fish holds. Structure is what actually cuts you off, so it drives leader material as much as the fish itself does. |
| water | fresh | Freshwater capable, so salt rating is a preference rather than a requirement. |
Field notes
The parts that do not fit in a table. These are the judgement calls that decide whether the numbers above turn into fish.
Everything scales down: #14 hooks, 4 lb line, a 6-foot ultralight. A "normal" bass setup is physically unusable here.
You will be wading. Sole choice matters more than rod choice on wet freestone rock.
Recommended components
Nothing below is hand-picked. Each stage is scored by matching the item's own published spec against this species' tolerances — hook size overlap, line tests inside the window, drag headroom, rod line rating. Anything that fails a hard check is dropped rather than softened.
Daiichi Dry Fly & Nymph Hooks
Tying hooks in the small sizes trout actually eat. Forged fine wire, chemically sharpened, consistent gape from box to box.
tradeoff These are for tying, not for buying pre-tied. If you are not sitting at a vise, you want a baited hook instead.
fitSizes #22–#8 cover #16 to #8 of the window. Rated 6 lb before the wire opens, 0.50× standard gauge.
VMC Barbarian Treble Hook
Round-bend replacement trebles. Most factory hard baits ship with mediocre hooks; swapping them is the cheapest performance upgrade in fishing.
tradeoff Three points means three ways to hook yourself and a much harder release. Illegal or restricted in a lot of salmon and trout water.
fitSizes #12–2/0 cover #12 to #7 of the window. Rated 45 lb before the wire opens, 1.30× standard gauge.
Seaguar InvizX Fluorocarbon
Fluorocarbon soft enough to fill a whole spool with. Sinks, hides, and gives you fluoro properties without needing a leader knot at all.
tradeoff Fluoro has memory and does not love spinning reels — it wants to jump off the spool. Baitcasters handle it far better.
fitSpooled in 4, 6 lb inside the 2–6 lb window. fluoro, 0.205 mm at 6 lb, visibility 0.08.
Berkley Vanish Fluorocarbon
The affordable way to try fluorocarbon as a mainline. Sinks and hides well enough to notice the difference on clear-water spinning gear.
tradeoff Stiffer and more memory-prone than premium fluoro. It will spring off a spinning spool in cold weather.
fitSpooled in 4, 6 lb inside the 2–6 lb window. fluoro, 0.22 mm at 6 lb, visibility 0.12.
No leader material in the catalog covers this test window yet.
Pflueger President Spinning Reel
The most recommended value spinning reel in existence, and deservedly so. Ten sealed bearings, a braid-ready spool, and a drag that holds its setting.
tradeoff Maxes out around 10 lb of drag. Fine for bass, walleye, and trout; not the reel for a big striper in a rip.
fit10 lb max drag against a 1 lb floor. spinning, size 3000, freshwater only.
Shimano SLX Baitcaster
Shimano gearing and braking at a price that makes no sense. Casts light baits well for a baitcaster and holds up to years of hard use.
tradeoff Still a baitcaster: right hand retrieve is not swappable, and 1/8 oz finesse baits belong on spinning gear.
fit12 lb max drag against a 1 lb floor. baitcast, size 150, freshwater only.
Daiwa Crossfire Ultralight
A true ultralight for trout, panfish, and creek work. Loads on a 1/16 oz jig, which no medium rod on earth will do.
tradeoff Rated to 6 lb line. Hook anything over about three pounds and the fight is genuinely out of your control.
fitRated 2–6 lb, overlapping this fish at 2–6 lb. 5.6 ft, UL power, moderate action, 0.0625–0.25 oz.
Temple Fork Outfitters NXT Black Label 5wt Fly Rod
A 9-foot 5-weight — the one fly rod that covers most trout fishing in North America. Sold as a combo with reel and line already balanced.
tradeoff A fly rod casts the line, not the lure, so nothing else in this build applies. Its weight rating is a whole separate system.
fitRated 2–8 lb, overlapping this fish at 2–6 lb. 9 ft, L power, mod-fast action, 0.005–0.05 oz.
Where you will find them
Venues that match this species' water type. Each one loads the studio with the pairing already set, so depth, current, and corrosion rules are applied before you pick a single part.
Farm Pond
Still, shallow, weedy, and forgiving. No current means the lightest weight that casts is the right weight.
Weedy Lake
Vegetation everywhere. Weedless rigging and enough backbone to pull a fish up out of the salad.
Clear Reservoir
Deep and gin-clear. Visibility is the enemy: this is where fluorocarbon leaders stop being optional.
Mountain Creek
Cold, tight, and fast. Short casts, tiny hooks, and slick rock that will absolutely put you on your back.
River Run
Real current. Weight is now a bottom-contact problem, and drift control beats casting distance every time.
Big River Channel
Heavy flow, low visibility, big fish. Two to four ounces just to stay where you put it, and scent over sight.
Hardwater / Ice
A vertical fishery through a hole. No casting, no current, and a temperature band that makes apparel a survival decision.
Load Brook Trout as the target and the builder re-runs every check on this page live — hook window, line test, leader material, drag floor — as you swap parts.
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