Fish Traps: Funnel Basket, Weir, and Trotline Construction

Reading Water: Where Fish Concentrate

Every fish species behaves differently, but some rules apply broadly:

Structure: Fish hold near structure — underwater rocks, logs, stumps, beaver dams, bridge pilings, weed beds, drop-offs. Structure provides ambush sites and refuge from current.

Edges: Transition zones between shallow and deep, fast and slow, sun and shade. Fish move along these edges to feed.

Current breaks: In rivers and streams, fish hold in areas where strong current is interrupted — behind rocks, in eddies, at the inside of bends. They face into the current and wait for food to come to them.

Depth: Most freshwater fish are deeper in summer midday heat, shallower in morning and evening, and suspend near the thermocline in stratified lakes. In winter, fish are slow and deep.

Spawning areas: Shallow gravel bars, weed beds, and tributary mouths during spawning season concentrate fish dramatically.

Funnel Basket Trap

A simple trap made from flexible branches, natural cordage, or salvaged wire. Fish enter through a funnel and cannot find the small opening to exit.

Materials

• Flexible branches 1/4 to 1/2 inch diameter (willow, dogwood, green sapling — needs flexibility, not strength)
• Natural cordage (woven basswood inner bark, dried stinging nettle fiber, vines) or synthetic cordage
• Two hoops for the main body (diameter determines what fish size you target)
• Bait

Construction

Step 1: Make the hoops. Bend two branches into circles and lash the ends together. One hoop will be the open end of the trap; the other is the mid-body support. Size: 8-12 inch diameter for a medium trap (sunfish, catfish, crappie).

Step 2: Build the cylinder body. Cut 12-20 straight sticks the length you want the trap body (12-18 inches). Lash one end of each stick to one hoop, spacing them evenly. Insert the second hoop partway along the sticks to keep them spread. Lash the sticks to the second hoop. Weave horizontal sticks in and out between the vertical sticks to complete the woven body. The gaps between sticks should be slightly smaller than the smallest fish you want to catch (3/4 to 1 inch gaps work for most small-medium fish).

Step 3: Make the funnel. The funnel is a cone shape pointing INTO the trap. Weave a cone from smaller sticks, tapering from the trap opening diameter down to a 2-3 inch opening at the narrow end. The narrow end should be small enough that fish have difficulty backing out.

Step 4: Seal one end. Close the back of the trap (opposite the funnel) completely with woven sticks or a tied-off bundle.

Step 5: Close the funnel end. Lash the wide end of the funnel to the open end of the trap body. The funnel should protrude into the trap interior by 3-4 inches.

Step 6: Create a removable access door. On the closed back end, make a small removable panel or opening to extract fish and re-bait the trap.

Baiting and Placement

• Bait: Worms, insects, berries, fish guts, bread, or any strong-smelling food. Place inside the closed end of the trap, beyond the funnel.
• Placement: In a stream, place perpendicular to the current at a pinch point or eddy. In a pond, submerge in 2-4 feet of water near structure (weed bed edge, submerged log).
• Anchor: Stake or rock. The trap should not drift or shift in current.

Stone Weir

A stone weir is a low wall of stones across a stream that deflects fish into a trap or channel. Historically one of the most productive fishing methods available to anyone with time and rocks.

Basic Concept

Build a V-shaped or funnel arrangement of rocks across a shallow stream. The V points downstream. Fish moving upstream (during spawning runs or when moving through a riffle) funnel into the narrow mouth of the V. A trap, net, or person at the narrow end collects them.

Construction

1. Choose a shallow riffle (6-18 inches deep) where the stream bottom is accessible.
2. Carry or roll flat rocks to build low walls in a V shape. Walls should be 6-12 inches high — enough to channel fish but not necessarily a complete barrier to water flow.
3. Place rocks carefully so they seat stably. Current will push against them.
4. The gap at the narrow end of the V should be 12-18 inches wide — wide enough for fish to enter but narrow enough to concentrate them.
5. Place a basket trap, gill net, or person with a spear or seine net at the narrow end.

Best timing: Spawning runs concentrate fish and make the weir dramatically more productive. Spring spawning runs of suckers, perch, and walleye are reliable and predictable.

Trotline

A trotline is a horizontal line strung across a waterway or along the bottom, with multiple hooks hanging from short vertical lines (droppers). Passive — set and check hourly to daily.

Materials

• Main line: Paracord, heavy fishing line, or braided natural cordage
• Droppers: Shorter pieces of lighter line (18-24 inches each), tied at 18-24 inch intervals along the main line
• Hooks: Commercial hooks, or improvised hooks from bone, wood, or bent metal (see improvised fishing article)
• Bait: Worms, cut bait (pieces of fish), chicken liver, insects
• Anchors: Rocks, stakes, or heavy objects at both ends

Setup

1. Anchor one end of the main line to a bank, tree, or stake.
2. Run the line across the waterway or along the bottom channel.
3. Attach dropper lines with hooks at 18-24 inch intervals along the main line.
4. Bait each hook.
5. Anchor the other end.
6. Mark the line at the bank so you can find it.

Depth: Trotlines can be set to run near the bottom (good for catfish and carp), mid-water (most species), or near the surface (night-feeding species).

Checking: Check every 1-4 hours. Fish on a hook will attract predators or become unsellable quickly. In warm water, 2 hours is a reasonable check interval.

Species Considerations

Catfish: Bottom trotline, chicken liver or cut bait, night sets in slow-moving or still water. Very effective.

Perch and panfish: Mid-water trotline with small hooks, worm or insect bait, near structure.

Walleye/pike: Larger hooks, cut fish bait, dawn/dusk sets in productive lakes.

Crayfish Trap

Crayfish are an often-overlooked protein source in freshwater environments. They are abundant in most streams and lakes, easy to trap, and provide significant protein.

Simple Crayfish Trap

Use the funnel basket design at 4-6 inch diameter. Place in a rocky-bottomed stream in 1-3 feet of water. Bait with fish scraps or meat. Check every few hours.

Alternative: Place a rock on a piece of meat (chicken neck, fish heads) at the bottom in shallow water. Come back in 30-60 minutes with a dip net or piece of screen. Crayfish will be feeding under the rock.

Caloric value: Roughly 80 calories per 100g of crayfish meat. A trap can yield dozens in a single night set — representing several hundred calories with minimal effort.

Reading Fish in Clear Water

In clear streams and ponds, you can often see fish and target trap placement precisely:

• Stationary fish facing into current are holding and feeding. A basket trap downstream and across the current from a concentration is well-positioned.
• Fish in a pool are often visible as shadows on the bottom. Trotlines set across the pool mouth intercept feeding movements at dawn and dusk.
• Spawning fish in shallow gravel are predictable. A weir across their stream is the most efficient intercept.