2026.10.25 2026.10.26

Advanced Winter Jighead Ajing: Depth, Drift and Fall Control for Tough Days and Big Aji

minagiman

After a while in ajing (light-lure fishing for aji, Japanese horse mackerel) you hit a wall: good days are good, but on tough days you catch nothing. The difference comes from how you build your approach around depth, current and the fall. Here is how to get that extra fish — and the bigger ones — on winter jighead rigs.

This guide assumes you know the basics: tackle, jighead weights and how to fish pier lights. If not, read the beginner’s guide first.

Contents

Think in sink rate, not weight
Measuring sink rate
Depth control: slice the water column by counts
Use the current: drift it naturally
Types of fall
Building actions
Reading bites
Jighead shape and hooks
Targeting 30 cm+ aji
Tough-day checklist
Fine-tuning tackle
Minagiman’s take
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Think in sink rate, not weight

Beginners pick jigheads by weight — heavier for wind, heavier for depth. Anglers who catch more think about how fast they want the rig to sink. The same 1 g sinks at different speeds depending on worm size and shape, line diameter and current. Your job is to find the sink rate the aji want that night.

Slower sink	Faster sink
Lighter jighead	Heavier jighead
Fatter or longer worm (more drag)	Slimmer or shorter worm
Let it sink without tension	Tungsten — small but heavy heads
Cast up-current and let it ride	Cast down-current so it works against the flow

Measuring sink rate

Count from splashdown to bottom, at the same tempo every time.
In the same spot, change only the jighead weight and compare counts.
Note the count, jighead and worm whenever you get a bite.

Building references like “1 g takes 15 counts to bottom under this harbour light” makes you much faster at new spots.

Depth control: slice the water column by counts

Winter aji often hold tightly in one layer — no bites up top, but steady bites near the bottom.

Step	What to do
1	Count to bottom to learn the depth
2	Work down from the surface in 3-count steps to find the biting layer
3	Focus around the count that produced bites
4	When bites stop, recheck the layers above and below — the school may have moved

Keep your retrieve speed and rod angle identical every time; change either and the rig runs at a different depth even with the same count.

Use the current: drift it naturally

On tough days, drifting with the current works best. Aji usually face into the flow waiting for food, so a worm that drifts naturally with it gets eaten.

Cast up-current — if the tide runs right to left, cast diagonally right.
Do not give too much slack — keep the line lightly tight and let the current carry the rig.
Only wind to take up slack — let the current do the work.
Feel for the “release” — where the current’s weight on the rig suddenly drops is a flow change, and a likely aji spot.

Light jigheads and low-stretch line make the current easier to feel — one reason advanced anglers like ester or ultra-thin PE.

Types of fall

Fall	How	When
Free fall	Slack line, sinks straight down	Active fish, getting to bottom fast; watch the line for bites
Tension fall	Line kept tight, rig swings toward you in an arc	Bites transmit to your hand; the most-used fall
Curve fall (with current)	Let the current carry the rig sideways as it sinks	Tough days, pressured schools; combine with drift

Under winter pier lights, the tension fall after each action is the core technique.

Building actions

Action	How	When
Lift and fall	Lift the rod lightly, then tension fall	When unsure — the winter default
Double twitch	Two small lifts to hop the worm, then fall	Scattered fish, need to get noticed
Stay	Pause a few seconds mid-fall or on the bottom	Cold water, sluggish fish
Slow retrieve	Constant, slow wind	Fish holding high in the water

Think of the action as “showing” and the fall as “feeding”. In winter, give the fall more time and bites usually increase.

Reading bites

Bite	Feel	Response
Tick	A small knock	Set immediately with a small wrist flick
Release	Tension suddenly drops	Aji ate upward — set right away
Heaviness	Gradual weight	Fish holding the bait — lift slowly to feel, then set
Line movement	Line runs sideways or stops	Bite on a free fall — take up slack and set

Keep hooksets small — just the wrist. Aji have soft mouths and big sweeps tear hooks out.

Jighead shape and hooks

Round heads sink straight and swim stably; dart or arrow heads move sideways more easily.
Tungsten is small for its weight — smaller silhouette, faster sink.
Small hooks are easier to suck in; larger hooks hold deeper and stay in big fish.
Open gape hooks catch more easily; straight points penetrate sharply.

On tough days, go small hook plus tungsten head; when hunting big aji, use a larger heavy-wire hook to make sure you land them.

Targeting 30 cm+ aji

Dark side of the light line — small aji sit in the light, big ones often hide in the dark.
Near the bottom — big fish may sit under the school; if you only catch small ones up top, go deeper.
Do not miss feeding windows — when the tide starts moving or before dawn.
Set the drag light so a lunge does not break the line.
Bring a net — soft mouths mean big aji should not be swung up.

Tough-day checklist

Change	Try
Worm	Smaller size, different shape (pintail → straight)
Colour	Clear ↔ glow, glitter ↔ no glitter
Jighead	Change by 0.2–0.3 g, or change shape
Depth	Recheck above and below in 3-count steps
Fall	Tension → free, longer pauses
Position	Other side of the light, or move up-current
Line	Thinner, to reduce drag and current effect

Change one thing at a time — then you know what made the difference.

Fine-tuning tackle

Part	Advanced guide
Rod	5’6”–6’ range; solid tip for hooking, tubular for current and bottom information
Reel	Light 1000–2000 with a smooth drag
Line	Ester 0.2–0.3 or PE 0.1–0.3
Leader	Fluorocarbon 0.6–1

Minagiman’s take

Ajing is an information game: finding where the aji are and what they respond to before anyone else. Jighead weight, counts, fall and position are all tools for collecting that information. On slow days, write down the count and conditions of every bite. A fish you can explain is the fastest route to the next level.