Why does my jerkbait sink (or float up) on the pause when the package says "suspending"?
Because it is tuned neutral at one water temperature — for most makers about 13 °C (55 °F), between 10 and 16 °C (50-60 °F) depending on the brand. The plastic body shrinks and swells with temperature more than water changes density, so colder water makes the same bait sink slowly and warmer water makes it rise. Add SuspenDots (lead tape) on the belly in warm water, remove them or fit lighter trebles in cold water; one 0.2 g dot moves the neutral point by roughly 5 °C (9 °F). Check it in a bucket at lake temperature.
The full story
This answer is one piece of a longer lesson — setups, diagrams and the reasoning behind it.
More questions about Jerkbaits (Suspending, Floating & Sinking)
- How long should I pause?
- Extra-fast or moderate action — which rod is right?
- How long a rod?
- Fluorocarbon or PE braid — and is nylon ever right?
- Rattling or silent?
- One-piece or jointed?
- What is "slow twitch" and when do I use it?
- Can I fish a jerkbait in grass at all?
- Do I need a loop knot?
- What size for smallmouth versus largemouth?
- When is the water too warm for a jerkbait?
- Which reel speed?
- How do I get it deeper?
- I get bit but keep losing them — why?
- Colour — natural or bright?