Funnel basket fish trap
A woven basket that fishes all night while you sleep — the highest return-per-hour food gear in tier 0.
Home: Wild food, Level 0 · Triage, level 1 of 1 in its track. Serves 3 steps across 2 subjects.
Every build on this site has hazards that injure or kill — quicklime, carbon monoxide, molten metal, collapsing ground. Read the safety notice before starting, and read this build's own failure modes below.
What it is and why this shape
A person fishing with a line is working the entire time they are fishing. A trap works all night, every night, while they sleep, build, or do anything else. That single difference is why every productive fishing culture on earth is built on passive gear.
The mechanism is one idea: a funnel that is easy to enter and hard to find from inside. A fish swims up the cone, through a narrow throat, into open space — and then searches the outside wall for a way out, because that is where the water and the light come from. The inward-pointing throat is almost invisible from within.
Everything else is basketry. Materials grow on the bank: willow, hazel, split cane, bamboo, brambles, roots. No metal, no fastenings, no tools beyond a knife.
Build ten, not one. A single trap is a lottery. A line of ten set in different water — a seam, a weed edge, an eddy, a channel — is a food supply, and it also tells you within a week which water is worth fishing.
Keyed parts
| 1 | Mouth hoop | The largest ring. Sets the trap diameter and takes the wear of setting and lifting. |
| 2 | Entry funnel | Woven cone tapering inward. The whole device is this one part; the rest is a container. |
| 3 | Throat | The narrow opening at the funnel's inner end. Its diameter selects what you catch. |
| 4 | Throat spines | Inward-pointing ends left long and springy, so a fish pushes past and cannot back out. |
| 5 | Body ribs and weave | Longitudinal ribs with a spiral weave between. Standard basketry. |
| 6 | Second funnel (optional) | A parlour. Doubles retention on lively fish at the cost of a harder emptying. |
| 7 | Tail door | Lashed shut, opened to empty. Emptying through the mouth loses fish every time. |
| 8 | Bait pocket | Suspended centrally so it can be smelt but not reached from outside. |
| 9 | Retrieval line and float | Marked, and long enough for a rising river. A trap you cannot find is a trap you have lost. |
Specifications
| Body length | 700 mm | 500–1,000 mm all work. Longer holds more; shorter is easier to set in weed |
| Body diameter | 350 mm | Set by the mouth hoop |
| Throat diameter | 70 mm | The selective dimension. Larger takes bigger fish and lets small ones out; smaller takes everything and strips the water |
| Funnel depth | 260 mm | Roughly a third of body length. Shallower and fish find the way back out |
| Funnel angle | ≈ 30° included | Gentle enough to swim up without hesitating |
| Rib count | 16–24, even | Even number so an over-under spiral weave closes correctly |
| Rib spacing at the body | 25–35 mm | Close enough to hold the target fish, open enough to pass water and debris |
| Weave material | 3–6 mm withies | Willow, hazel, cane, bramble, split root — soaked before use |
| Ballast | 1–3 kg | A stone lashed inside. An unweighted trap rolls in current and fishes nothing |
| Soak time before weaving | 12–48 h | Non-negotiable with willow. Dry withies snap at every bend |
Bill of materials
| Material | Quantity | Notes and substitutes |
|---|---|---|
| Withies for ribs | 20–24 × 1.1 m | Straight one-year willow or hazel rods, 8–12 mm butt. Cut in winter if you have the choice — they keep better. |
| Withies for weaving | large bundle | Thinner and more flexible than the ribs. Substitute: split cane, bamboo, bramble with thorns stripped, split roots. |
| Hoop material | 3 × 1.2 m | For the mouth, mid-body and tail hoops. Steamed or soaked and bent round a form. |
| Cordage | ≈ 8 m | Lashing the hoops and the tail door. See Cordage. |
| Ballast stone | 1 | Lashed inside near the tail, so the trap sits mouth-down-current and stays put. |
| Retrieval line | 3–10 m | Longer than the deepest water you will set in, plus margin for a rise. |
| Float or bank marker | 1 | Wood, gourd or a bark bundle. Mark it so it reads as yours. |
Tools: Knife · Awl or pointed stick for opening the weave · Soaking pit or stream · Something to bend hoops around
Construction
Cut and soak the material
Make the hoops and set the ribs
Weave the body
Weave the funnel
Leave the throat spines long
Fit the tail door and ballast
Set it correctly
Bait, check daily, and move it
Tolerances that matter
| Dimension | Target | Why it matters |
|---|---|---|
| Throat diameter | 70 mm ±10 | It is the only thing selecting your catch size. Too small strips the water of juveniles and destroys next year's fishing. |
| Funnel depth | ≥ 1/3 body length | A shallow funnel puts the throat within easy reach of a fish searching the wall, and it escapes. |
| Weave gaps | < smallest kept fish | Otherwise you are holding water and losing catch. |
| Rib count | even | An odd count makes the over-under spiral fail to close on each lap. |
| Ballast | enough not to roll | A rolling trap fishes nothing and abrades its own weave to pieces. |
How this fails
How you know it worked
Scaling and variants
Smaller: a minnow-sized trap with a 25 mm throat, set in the shallows, catches bait — which then fishes the set lines and the bigger traps. Bait supply is often the real constraint, and this solves it for an afternoon's weaving.
Larger, and far more productive: a weir or fish fence — a barrier of stakes and wattle set across a channel with one or two funnel openings, guiding fish into traps or a holding pen. It is the single highest-yield fishing structure there is, it works with tide or migration, and it needs no bait at all. It is also a serious construction project and a serious ecological intervention: a weir across a whole river will block a migration completely. Always leave a passage open, and open it entirely during spawning runs — a river fished to exhaustion feeds nobody the following year.
Different water, different trap: eel traps run long and narrow with a very small throat; crab and lobster pots use a wide flat body and a top-entry funnel; shrimp traps use a fine mesh throughout. The funnel principle is identical in every case.