Reels, float lines and breakaway systems
Explainer · Last reviewed 2026-08-18
Three ways of staying connected to a shot fish, and what actually separates them is what happens when something goes wrong — which is why the choice is a safety decision as much as a fishing one.
Safety: entanglement — can cause serious injury or death.
Never dive alone, dive one up one down, and never extend a dive for a fish.
Once a fish is shot it has to be controlled and recovered. There are three architectures and they fail differently.
A REEL mounts on the gun and pays out line. Everything stays with the diver, which is compact, uncluttered and good in confined ground. The failure mode is that the diver is directly connected to a fish that may be heading into structure — and reel line around a diver is an entanglement hazard the diver is holding.
A FLOAT LINE runs from the gun to a surface float. The fish tows the float, the float provides drag and marks the fish's position, and the diver can let go. The failure mode is drag and tangle: a float line is a long piece of line trailing behind a swimming diver, through kelp, over rock and near boats.
A BREAKAWAY separates the gun from the fish at the moment of the shot. The shaft, tip and line detach and go with the fish to a float, leaving the diver holding an unencumbered gun. This is the blue-water standard for large fish and it is the architecture that most decisively removes the diver from the connection.
THE PRINCIPLE UNDERNEATH ALL THREE: the more powerful the fish and the more structure it can reach, the more valuable it is that the diver is NOT the thing attached to it.
How the water decides
SHORE DIVING IN CONFINED GROUND favours a reel or a short float line. Long trailing line in kelp, gullies and surge is a liability, and the fish being taken are usually manageable.
OPEN WATER AND LARGE FISH favour a breakaway to a substantial float, sometimes to more than one. A large pelagic fish will take a diver down or drag them a considerable distance, and neither is acceptable.
REEF DIVING IN CLEAR WATER is where the argument is liveliest, because both work and divers have strong preferences shaped by what they learned first.
BOAT DIVING adds a consideration that favours floats: a float is visible to the boat and marks where the diver and the fish are, which is a safety benefit independent of the fishing.
The recurring error is using a reel because it is tidy on ground where a fish can reach structure. A fish that runs into a hole with the diver attached is the situation the entanglement page describes, and the equipment choice made it possible.
Floats are safety equipment first
Whatever the connection architecture, the float itself is doing a second job that has nothing to do with fish.
It marks the diver's position for boats, which is the single measure that addresses propeller strike. It carries the locally recognised dive flag where one is used. It gives the diver something to rest on at the surface, which matters in current and after a hard dive. And it keeps the catch away from the diver's body, which is a genuine consideration in water holding sharks.
So the question of whether a float is needed has a different answer depending on which function is being asked about — and the safety functions apply even on a session where nothing is shot. That is why the float appears on FishingHQ as safety equipment with a fishing use rather than the reverse.
Official guidance — why, and the sources (1)
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
- BSAC diving safety guidance and annual incident report — British Sub-Aqua Club (Water-safety or diver-training authority)Relied on for: Diving safety guidance on surface marking, dive flags, boat traffic and diver visibility.States this directlyCitation checked — the work exists and is described correctly
Three ways of staying attached to a fish, and what each one attaches it to
Three ways of staying attached to a fish, and what each one attaches it to
Rig · Draft — not yet checked against an external reference
This drawing has not been checked against any reference outside FishingHQ. It shows how the components are arranged; it is not a certified tying sequence. Follow the written steps.
Describe this diagram in words
Three arrangements drawn side by side beneath one sea surface, each headed above it, each showing a speargun, a shooting line and a fish, and differing only in what the line connects to. In the first, headed REEL, the line runs from a reel mounted on the gun down to the shaft in the fish, so everything the fish does is transmitted back to the gun the diver is holding; it is labelled as the fish pulling on the diver, and the line stays on the gun. In the second, headed FLOAT LINE, a line runs from the gun up to a float on the surface as well as out to the fish, so the gun can be let go of and the fish is pulling against the surface. In the third, headed BREAKAWAY, the gun sits with nothing attached to it at all, marked by an arrow and labelled as free, while a single line runs from a float on the surface straight down to the shaft in the fish — the fish tows the float and is joined to nobody. The heading says these are three answers to one question rather than three grades of the same thing, and the question is what the fish is pulling against once the shaft is in it. The concluding note adds the consequence the figure does not draw: a reel keeps the line beside the diver. No line length, breaking strain or float size appears anywhere.
How this drawing was produced
Drawn from coordinates written by hand for this figure and rendered by the site's own diagram component, using the shared element vocabulary rather than any per-diagram styling. No diver appears in any of the three panels, deliberately: the subject is a connection rather than a person, and the one place a body genuinely matters — that a reel leaves loose line beside the diver — is stated in the concluding note instead of drawn, because drawing it would mean drawing an entanglement. Nothing is traced from any manufacturer's drawing and the figure carries no numbers of any kind.
Safety
Never dive alone, dive one up one down, and never extend a dive for a fish. The full set of breath-hold essentials — training, the buddy system, conditions, equipment and visibility — is on the spearfishing safety page.
Entanglement — Can cause serious injury or death
A diver connected by reel line to a fish running into structure can be pulled into it or held by their own line. Trailing float lines snag on kelp, rock and boats.
What reduces it: Matching the architecture to the ground and the fish, using breakaways where fish can reach structure or run hard, keeping line stowed and known, and carrying a knife that will cut the line in use.
Where to go next
Where it matters
Related reading
- Controlling a fish after the shotTransferring the fish to a float means it tires against buoyancy rather than against a person on a finite breath.
- Flashers, and what attracting a fish actually changesA fish taken beside a flasher runs through a volume of water containing several other lines, which is the case breakaway rigging exists for.
- Reel jams, clips and the rigging that fails quietlyA breakaway that has not released has quietly become a fixed rig, which is the failure the system exists to prevent.
How this compares
Sources and evidence
- FAO fishing gear types and fishing technology information — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Gear configuration for spear fishing including line and float arrangements.Background and mechanism onlyCitation checked — the work exists and is described correctly
Why the 7 connections on this page are here, and the sources
Where it matters
Official guidance — 2 connections
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
Blue-water spearfishing
The environment where the architecture matters most.
- BSAC diving safety guidance and annual incident report — British Sub-Aqua Club (Water-safety or diver-training authority)Relied on for: Diving safety guidance on surface marking, dive flags and diver visibility.States this directlyCitation checked — the work exists and is described correctly
Spearfishing
A membership assertion rather than a topical one: this page teaches the discipline or its equipment, so the discipline's mandatory safety posture applies to it.
- CMAS technical and sporting standards for underwater activities — Confédération Mondiale des Activités Subaquatiques (Standards body)Relied on for: Breath-hold spearfishing as a defined discipline with its own technical, equipment and safety standards, set out by the international underwater federation.States this directlyCitation checked — the work exists and is described correctly
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: That the safety requirements of breath-hold diving apply across the discipline rather than to particular equipment or techniques within it.States this directlyPassage read and verified
Related reading
Official guidance — 1 connection
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
Controlling a fish after the shot
The equipment answer to the problem this page describes.
- BSAC diving safety guidance and annual incident report — British Sub-Aqua Club (Water-safety or diver-training authority)Relied on for: Diving safety guidance on planning, conditions assessment, buddy protocol, entanglement and equipment handling.States this directlyCitation checked — the work exists and is described correctly
What experienced anglers do — 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.
Flashers, and what attracting a fish actually changes
One record resolves a question the other raises and cannot answer alone.
- CMAS technical and sporting standards for underwater activities — Confédération Mondiale des Activités Subaquatiques (Standards body)Relied on for: Breath-hold spearfishing as a defined discipline with its own technical, equipment and safety standards, set out by the international underwater federation.States this directlyCitation checked — the work exists and is described correctly
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: That the safety requirements of breath-hold diving apply across the discipline rather than to particular equipment or techniques within it.States this directlyPassage read and verified
Reel jams, clips and the rigging that fails quietly
One record resolves a question the other raises and cannot answer alone.
- CMAS technical and sporting standards for underwater activities — Confédération Mondiale des Activités Subaquatiques (Standards body)Relied on for: Breath-hold spearfishing as a defined discipline with its own technical, equipment and safety standards, set out by the international underwater federation.States this directlyCitation checked — the work exists and is described correctly
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: That the safety requirements of breath-hold diving apply across the discipline rather than to particular equipment or techniques within it.States this directlyPassage read and verified
How this compares
Official guidance — 2 connections
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
Speargun reels
The component record and the architectural decision around it.
- BSAC diving safety guidance and annual incident report — British Sub-Aqua Club (Water-safety or diver-training authority)Relied on for: Diving safety guidance on surface marking, dive flags and diver visibility.States this directlyCitation checked — the work exists and is described correctly
Dive floats and float lines
The float's safety functions apply on a session where nothing is shot.
- BSAC diving safety guidance and annual incident report — British Sub-Aqua Club (Water-safety or diver-training authority)Relied on for: Diving safety guidance on surface marking, dive flags and diver visibility.States this directlyCitation checked — the work exists and is described correctly
What experienced anglers do — 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.
Speargun reels
An explainer carrying a mechanism the equipment record depends on.
- CMAS technical and sporting standards for underwater activities — Confédération Mondiale des Activités Subaquatiques (Standards body)Relied on for: Breath-hold spearfishing practice, equipment convention and the safety expectations set out by the international underwater federation.States this directlyCitation checked — the work exists and is described correctly
- BlueWater Hunting and Freediving — BlueWater Freedivers, Ventura, California, 1995 (Practitioner report)Relied on for: Spearfishing equipment and practice: gun, shaft, tip and rigging choice, and the handling of a shot fish, from a practitioner tradition distinct from the European one.States this directlyCitation checked — the work exists and is described correctly
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