Line memory, stretch and bite detection
Explainer · Last reviewed 2026-08-11
Memory is line holding the shape of the spool and stretch is line absorbing movement, and both sit between the fish and the angler's hand deciding how much of a bite arrives.
Two properties of a line decide how much of what happens at the hook reaches the angler, and they are different properties with different causes.
MEMORY is the tendency of a line to hold the shape it has been stored in. Nylon and, to a lesser extent, fluorocarbon are viscoelastic: wound onto a spool under tension and left, they take a set, and the line comes off in coils. Those coils have to be pulled straight before any movement at the hook can travel up the line, so a memory-heavy line inserts a dead zone between the bite and the rod tip. Braid has effectively no memory, which is one of its real advantages.
STRETCH is elastic extension under load. Nylon extends substantially — enough that at long range a large proportion of a fish's movement is absorbed by the line before the tip moves. Fluorocarbon extends less. Braid extends very little.
The two combine into a single practical consequence: the further away the fish is and the more memory-heavy and stretchy the line, the more of the bite is lost before it arrives. At close range on a short line the difference is small. At a hundred metres in deep water it is the difference between registering a bite and not.
Stretch is not simply a defect, though, and that is the part usually left out. The same elasticity that hides a bite also cushions a hook hold, forgives a hard strike, and prevents a hook pulling when a fish lunges at the net.
What causes memory, and what reduces it
Memory increases with time on the spool, with tightness of winding, with heat, and with the tightness of the coil — which means small spools produce more of it than large ones for the same line.
Storage matters accordingly. Line left tightly wound on a small spool in a hot car for a winter arrives in the spring in a state no amount of casting will fix. Line stored loosely, cool and out of sunlight keeps far better.
Line can be relaxed by stretching it: casting a length out and retrieving under tension pulls the coils out, and many anglers do this deliberately at the start of a session. It is a temporary fix, and it is also the point at which the line's age becomes obvious.
Stiffer nylons hold more memory than supple ones, which is one of the reasons the same nominal breaking strain from two makers behaves so differently on the reel.
Choosing which problem to have
Where bite detection is the constraint — deep water, long range, subtle takes, feeder and drop-shot work — anglers overwhelmingly move to low-stretch braid and accept that the system has lost its cushion, then put the cushion back with a softer rod tip, a lower drag setting, or a length of nylon leader.
Where hook holds are the constraint — hard-mouthed fish at close quarters, snags, or lively fish on light hooks — the reverse choice is common, and the stretch is the point rather than a cost.
Both patterns are widely and independently reported across coarse, sea and game angling. They are reasoning about a trade-off rather than evidence about outcomes, and FishingHQ records them as convention. What is not convention is the mechanism: a line that extends absorbs movement, and that is measurable with a spring balance and a ruler.
Practitioner consensus
Widely and independently recommended by experienced anglers and specialist sources. This is real angling knowledge, not proof: controlled evidence for it is limited, and FishingHQ records it as convention rather than as a demonstrated effect.
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Coarse angling practice on line choice for bite detection at range and on the feeder.States this directlyCitation checked — the work exists and is described correctly
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Sea angling practice on braid and monofilament for deep and distance work.States this directlyCitation checked — the work exists and is described correctly
The mistakes that follow from ignoring both
Blaming missed bites on shy fish when the line is three seasons old and full of coils.
Moving to braid for detection and keeping a stiff rod and a tight drag, so that the whole system has no give anywhere and hook pulls replace missed bites.
Filling a spool too full, which increases both memory and the tendency of coils to jump off in loose loops.
Assuming stretch is constant. It is not: nylon that has been repeatedly loaded near its limit stretches further and recovers less, which is a sign that the line is finished rather than a property to work with.
Where to go next
Where it matters
- Drop shottingDrop-shotting depends on feeling a light take through a vertical line, which is the presentation stretch damages most.
- LedgeringLedgering at range is where line stretch stops being an abstraction: the further the bait, the more of the bite the line absorbs before the tip moves.
What these connections rest on (2)
Practitioner consensus — 2 connections
Widely and independently recommended by experienced anglers and specialist sources. This is real angling knowledge, not proof: controlled evidence for it is limited, and FishingHQ records it as convention rather than as a demonstrated effect.
Drop shotting
Low-stretch line is treated as part of the method rather than as an option in drop-shot practice.
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary lure angling practice with modern materials and lure types.States this directlyCitation checked — the work exists and is described correctly
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Saltwater lure angling practice with the same materials and lure types.States this directlyCitation checked — the work exists and is described correctly
Ledgering
Bite detection at distance is the central practical problem of ledgering and is discussed in exactly these terms.
- IGFA International Angling Rules and World Record Requirements — International Game Fish Association (Angling or fisheries organisation)Relied on for: Tackle definitions and the dimensions by which tackle is specified.Background and mechanism onlyPassage read and verified
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: British freshwater practice on tackle selection and its reasoning.States this directlyCitation checked — the work exists and is described correctly
Gear this affects
- Braided lineBraid is chosen mainly for the absence of these two properties, which makes them the right frame for understanding it.
- Monofilament lineMemory and stretch are nylon's two defining behaviours and the reason it both hides bites and saves hook holds.
What these connections rest on (2)
Practitioner consensus — 2 connections
Widely and independently recommended by experienced anglers and specialist sources. This is real angling knowledge, not proof: controlled evidence for it is limited, and FishingHQ records it as convention rather than as a demonstrated effect.
Braided line
Bite detection at range is the reason most consistently given for moving to braid.
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary lure angling practice with modern materials and lure types.States this directlyCitation checked — the work exists and is described correctly
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Saltwater lure angling practice with the same materials and lure types.States this directlyCitation checked — the work exists and is described correctly
Monofilament line
The dual character of stretch — cushioning and concealment — is standard reasoning across traditions.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Sea angling practice on tackle and presentation in tidal water.States this directlyCitation checked — the work exists and is described correctly
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comparable reasoning from the freshwater tradition, independently arrived at.Background and mechanism onlyCitation checked — the work exists and is described correctly
Related reading
What these connections rest on (1)
Practitioner consensus — 1 connection
Widely and independently recommended by experienced anglers and specialist sources. This is real angling knowledge, not proof: controlled evidence for it is limited, and FishingHQ records it as convention rather than as a demonstrated effect.
Bite detection on a beach
A mechanism edge from a record to the reasoning beneath it, resting on shore-fishing practice reported consistently across independent practitioner sources rather than on experiment.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK sea angling practice as reported by practitioners, including regional ground, bait and tackle convention.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK angling practice as reported by practitioners, including tackle and technique convention.States this directlyCitation checked — the work exists and is described correctly
How this compares
What these connections rest on (1)
Practitioner consensus — 1 connection
Widely and independently recommended by experienced anglers and specialist sources. This is real angling knowledge, not proof: controlled evidence for it is limited, and FishingHQ records it as convention rather than as a demonstrated effect.
Monofilament, fluorocarbon and braid
The two subjects are inseparable in practice and are separated here only because one is about materials and the other about behaviour.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Sea angling practice on tackle and presentation in tidal water.States this directlyCitation checked — the work exists and is described correctly
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comparable reasoning from the freshwater tradition, independently arrived at.Background and mechanism onlyCitation checked — the work exists and is described correctly
Sources for this page
- IGFA International Angling Rules and World Record Requirements — International Game Fish Association (Angling or fisheries organisation)Relied on for: Line class definitions, which are defined by tested breaking strain and therefore by a property that changes as line ages.Background and mechanism onlyPassage read and verified
How FishingHQ labels evidence is explained in the evidence policy.