EP-001 · METHODS & TACTICS · SALTWATER · SHORE / OFFSHORE · UPDATED 2026-08-25 · DRAFT
The short version: Jig weight is not the answer to depth. It is how you buy casting range, sink rate, line-angle control, and time in the layer you actually want to fish.
01. Start With the Decision, Not the Number
The first question most people ask is simple: “How deep is it, and how many grams should I throw?” It is a fair starting point, but it is not enough. Depth tells you how much water the jig has to travel through. It does not tell you how much wind is bowing your line, whether the surface and midwater currents are moving in different directions, how much drag the jig shape creates, or where the fish are actually sitting.
Instead of hunting for one magic weight, watch for three things:
- Can the jig reach the distance or depth you want?
- Can you stay in touch with it and read what the line is doing?
- Is it ploughing bottom, getting swept sideways, or feeling too light to control?
Bring a Small Weight Staircase, Not a Formula
This is not a universal weight chart. It is a practical way to make your first few casts useful when you do not have local notes. A small staircase—say 20g, 30g, 40g and 60g—usually teaches you more than one “do-it-all” jig. Shore-jigging guidance commonly treats 20–40g as a useful starting zone, moving heavier when the water gets deeper, the current speeds up, or wind starts killing your cast [3].
| What you are looking at | First weight to try | What decides the next move |
|---|---|---|
| Sheltered marina water, shallow gutter, close target | 20–30g | Repeated bottom contact or snags: go lighter or speed up. Cannot reach the zone: go heavier. |
| Everyday jetty, gentle point, or a longer search cast | 30–40g | Can you hit the planned count and still feel the line? |
| Crosswind, side current, deep wall, open-water surge | Start at 40–60g | If the jig keeps sweeping away and bottom contact disappears, step up or use a slimmer profile. |
| Heavy shore work around deep edges and strong flow | 60g+—only within the rod rating | Heavier only helps if the cast, retrieve, and jig action are still under control. |
Where does 30g fit? It is a very good first test jig in a lot of inshore situations. It is not a law. Change the rod, line diameter, wind, jig body, or bottom shape and 20g or 40g may be the better call that day.
Non-Negotiables
- Check the local marine forecast, tide, and current before you launch or step onto the rocks. Use the relevant local authority where you fish; NOAA is one example of the kind of marine forecast service to consult in U.S. waters [5].
- Stay inside the rod’s stated casting or jig-weight range. Overloading the rod just to get down faster is not a tactic.
- On the shore, sort out your exit, wave set, slippery footing, and fishing partner before the first cast. A deep mark is not automatically a safe mark.
02. What the Water, Jig, and Line Are Really Doing
Weight is only one part of the system. Jig shape and frontal area, line diameter and length, cross-current, and the movement of the boat or angler all create drag. Shimano pro Benny Ortiz frames jig selection around depth, target zone, and jig shape: long, narrow jigs generally cut water better in stronger current, while wider jigs give more flutter in lighter flow [1].
So do not ask, “What weight for 50 metres?” Ask, “In today’s current, can I run this jig through the 50-metre zone on a clear, repeatable line?”
Shore Jigging: You Are Fishing a Diagonal Line
The further you cast, the more arc and angle the line carries underwater. The jig normally works deeper at the far end of the cast, then cuts back through shallower water as you retrieve. Here, weight is doing four jobs at once:
- helping the jig reach a workable casting distance inside the rod’s rating;
- reducing line bow in side wind and cross-current;
- getting the jig down without making it bulldoze the bottom; and
- giving you enough contact to tell a swing, a tap, bottom, and a bite apart.
That is why the same 30g jig can feel too heavy in a calm harbour and too light from an exposed breakwater.
Offshore: Read the Line Angle, Not a Depth Multiplier
Boat jigging is often reduced to “water depth times a number.” That can be a rough first guess, nothing more. In neutral conditions, Ortiz offers starting points of around 1g per foot for speed jigs and under 1.5g per foot for slow jigs, then adjusts the weight to keep the presentation closer to vertical [2]. That is roughly 3.3g per metre for speed jigs and up to about 4.9g per metre for slow jigs—but it is not a formula that travels perfectly between jig styles, boats, and oceans.
Do not treat depth ×2 or depth ×3 as a hard rule. Put those numbers in your first-drop notes if they help, but keep using them only when your line angle, sink time, bottom contact, and time in the target zone all say they are working.
03. Build the System Before You Fish It
Match the Shape to the Flow, Then Fine-Tune the Weight
You do not need every jig on the shop wall. Carry three or four weights in the same family—or at least with similar profiles—so you can tell whether the problem is grams or shape. In stronger flow, longer, narrower jigs usually hold their sink path better; in lighter flow, wider jigs can give a more open flutter [1].
Here is the real-world version. In deep water, over offshore reef, or in layered current, a 180g ultra-slim jig is not useful just because it is heavy. Compared with a wider 180g jig, its narrower frontal profile can give the current less to push against. That usually helps it cut into the water column and leaves you more room to hold a near-vertical line angle [1]. It is a relative hydrodynamic advantage, not magic: oversized braid, fast boat drift, or too much current will still pull it off line. When that happens, step up in weight, change the drift, or wait for a better window.
Rear-weighted jigs are often chosen for a faster, more direct drop. Do not assume rear-weighted means “best on bottom” in every situation. Follow the maker’s guidance, watch the fall, and judge it by what you can actually feel that day.
| Check before you leave | What to look for | What goes wrong if you skip it |
|---|---|---|
| Rod | The jig sits inside its stated working range | Overloading hurts casting safety, rod control, and timing. |
| Main line and leader | Diameter, knots, abrasion resistance, target fish, and structure all match | Too much line bow, abrasion failure, or a weak knot. |
| Hardware and assist hook | Rings, hook, cord, and jig eyes are clean and undamaged | Open rings, lost fish, or a failed hook point under load. |
| Jig group | You have adjacent weights in comparable profiles | You cannot tell whether changing conditions or a different jig shape caused the result. |
04. The Field Routine: First Probe, Then Fish the Zone
Shore-Jigging Water-Column Matrix
| Zone | First move | What you are reading | First correction |
|---|---|---|---|
| Surface / just under the surface | Close the bail quickly; use a fast straight retrieve with short lifts | Is the jig still tracking just under the skin rather than popping out? | Dropping too quickly: go one step lighter or shorten the pause. Cannot hold distance: go heavier. |
| Midwater | Make one full countdown to bottom, then work a middle slice of that count | Total fall time, the moment the line relaxes, and where bites happen | Change one count band at a time before changing weight. |
| Bottom zone | On the first touch-down, start short lifts and controlled retrieves | Can you tick bottom now and then instead of dragging it all the way? | Constant snagging: shorten the count or speed up first; then go lighter. Never finding bottom: go heavier or slimmer. |
The Countdown Is a Ruler for Today—Not a Depth Sounder
The method only works when the setup stays comparable: same day, same jig, same line system, and roughly the same current. Make one full drop simply to learn how long it takes to hit bottom. From there, a one-third, half, or two-thirds count gives you a repeatable slice of the water column.
Do not wait for a huge thump to call the first touch-down. Often the signs are small: coloured braid suddenly stops paying out or goes briefly slack; the rod tip gives a tiny rebound as the jig unloads. Log those signs with the count. If you cannot see the line or feel the rebound, do not assume you have hit bottom—make another probe drop.
The moment wind, current, casting angle, or jig changes, your old count stops being reliable. Calibrate again.
Offshore Sequence
- Make one probe drop first. Do not start working the jig immediately. Note the fall speed, line angle, first bottom contact, and boat drift.
- Read the angle before blaming the weight. If the line quickly sweeps away, the jig may already be outside the structure you think you are fishing. Try one weight step heavier or a better-cutting profile, then probe again.
- Work a zone, not just the bottom. If fish are suspended, note the count where they show and work short lifts, pauses, and drops around that band.
- Reset when the drift changes. A change in boat speed, tide phase, or wind direction makes the old count obsolete.
05. When It Is Not Working
| What you see | Likely reason | First adjustment |
|---|---|---|
| The line gets swept away on the fall; you cannot reach the intended depth | Too little weight, too much jig drag, or stronger current / drift | Go one step heavier. If it still sweeps, try a slimmer jig and re-count. |
| Every cast ploughs or snags bottom | The count is too deep, the jig is too heavy, the retrieve is too slow, or the ground rises toward you | Shorten the count or speed up first. Go lighter only if it still drags. |
| Casts die early into the wind | Rod and jig are mismatched, line bow is excessive, or the wind has shifted | Step up inside the rod rating and check line fill / diameter. Do not try to “fix” unsafe conditions with more lead. |
| You touch bottom offshore but the line is badly angled | The jig is off the structure or different layers are moving differently | Increase weight, use a slimmer profile, or reset the drift. Judge the line angle, not bottom contact alone. |
| A heavier jig kills the bites | You have traded away time in the target zone, action, or bait-size match | Step back one weight, change shape, or relocate the fish layer—do not keep adding grams. |
Three Useful Case Lessons
1. Shape matters when current is the problem. Ortiz treats depth, target zone, and jig shape as separate selection variables, with long slim jigs favoured in harder current and wider jigs in lighter flow [1]. If more weight still does not make the path readable, the profile may be the variable you missed.
2. One depth can have two sensible starting points. In roughly 100 feet of water under neutral conditions, the same professional guide suggests around 100g for a speed jig and 130–150g for a slow jig, then asks the angler to adjust for a closer-to-vertical presentation [2]. Same depth; different technique, different first answer.
3. Let contact give you the answer from shore. A shore-jigging guide treats “I cannot feel it down” or “it sweeps away before sinking” as reasons to step up, while repeated snagging means go lighter or retrieve faster [3]. That feedback loop travels better than a fixed depth chart.
06. Safety, Fish Care & Local Rules
Metal jigging often takes you into deeper water, heavier tackle, and a faster pace. That is exactly why release planning belongs in the kit before the first drop. Keep dehooking pliers, line cutters, a suitable landing net, and any locally required release tool close at hand. NOAA’s general guidance includes using tackle strong enough to avoid exhausting fish, keeping handling in the water where possible, minimizing air exposure, using wet hands, and supporting the fish along its body rather than lifting by the mouth or gills [6].
Fish brought up from deep water can show barotrauma. The details vary by species and region, but the practical lesson is simple: know your local rules, have the right release tools ready, and be prepared to return fish to depth when appropriate [6][7]. This is not legal advice. Size limits, seasons, bag limits, hook rules, descending-device requirements, and shore-safety rules must be checked with the authority for the water you are actually fishing.
Before You Cast: The 90-Second Weight Check
- Which layer are you trying to reach: surface, a particular countdown band, the bottom edge, or an offshore structure?
- Bring adjacent weights, not one “universal” jig.
- Make a no-action probe drop and note the count, line angle, bottom contact, and drift.
- Change one variable at a time: one weight step, one jig shape, one count band, or one route.
- If safety, rod limits, or local rules say no, stop adding weight. Change spots or call the session.
Sources & Editorial Note
- Shimano — Jig Selection Tips by Benny Ortiz (professional guidance; conditions apply).
- Shimano — speed and slow-jig starting references (professional starting points, not universal rules).
- Britannic Trade — Shore Jigging in the UK (regional, practical guidance).
- Shimano Australia — A Guide to Shore Jigging (regional guide).
- NOAA — Marine Forecasts and Predictions.
- NOAA Fisheries — Catch and Release Best Practices.
- NOAA Fisheries — Return ‘Em Right.
Editorial note: weight ranges and depth references in this guide are starting points, not a substitute for local conditions, manufacturer limits, or fishing regulations.