Double surgeon's knot
Knot · Last reviewed 2026-08-19
The line-to-line join that does not care whether the two lines match. Four operations, tied in seconds with cold hands, and the standard answer where a blood knot's diameter limit bites.
THE SURGEON'S KNOT EXISTS BECAUSE THE BLOOD KNOT HAS A LIMIT, AND THE LIMIT IS DIAMETER.
A blood knot joins two lines by wrapping each around the other, and that construction depends on the two lines behaving similarly under the wrap. Join a fine tippet to a much heavier butt section with one and the thin line bites into the thick one, which is a cut waiting to happen rather than a join.
A surgeon's knot sidesteps the problem entirely by never treating the two lines as separate. The overlapped pair is tied as though it were one doubled line — an overhand knot, then a second pass through the same loop — so the knot does not know or care that one strand is 0.12 mm and the other 0.35 mm. Vermont Fish & Wildlife puts the resulting property directly: it joins lines regardless of line diameter or line type.
WHAT YOU PAY FOR THAT IS PROFILE AND SYMMETRY. The finished knot is a small barrel with four ends leaving it, and it is not as slim or as neatly tapered as a blood knot or a wrapped join. It will pass through rod rings on ordinary tackle and it is the wrong choice where a join has to travel through the rings at beach-casting speed under a heavy lead.
IT IS ALSO THE KNOT THAT GETS TIED WHEN CONDITIONS ARE WORST. Four operations, no counting of turns, and no requirement to keep two separate wraps even — which is exactly why fly anglers changing tippet in failing light reach for it and why it belongs in anybody's cold-weather repertoire.
THE THIRD TURN IS A REAL DECISION RATHER THAN A REFINEMENT. Passing the ends through a third time makes a triple surgeon's, which grips better in slick or very hard material at the cost of more bulk. Braid is the case where it earns its place.
- Used for
- Joining two lines
- Holds in
- Monofilament, Fluorocarbon, Braid
How to tie it
These written steps are the instruction. The diagram supports them.
- Lay the two lines alongside each other so they overlap by about 20 cm, running in opposite directions.
- Treating the overlapped pair as a single doubled line, form a loop and pass the whole leader plus the tag of the main line through it once. That is one overhand knot in the doubled section.
- Pass the same ends through the same loop a second time. Do not tighten anything yet — the turns must stay open until the knot is wet.
- For a third turn, pass them through once more. Do this in braid and in stiff heavy fluorocarbon, and leave it out in ordinary monofilament where it only adds bulk.
- Wet the whole knot thoroughly.
- Draw it up by pulling all four ends at once — both standing lines and both tags — steadily rather than sharply, so the turns bed down as a single barrel.
- Check the barrel is even and that no turn has crossed over its neighbour, then trim both tags close.
- 1. Lay the two lines alongside each other, overlapping by about 20 cm, running opposite ways.
- 2. Treating the overlapped pair as one doubled line, pass both ends through a loop once.
- 3. Pass the same two ends through the SAME loop a second time.
- 4. Wet it, draw up by pulling ALL FOUR ends together, and trim both tags.
Tying a double surgeon's knot
Knot · Verified — every stage checked against a canonical reference — reference: How to Tie Fishing Knots — uni, blood, improved blood, surgeon's and loop knots; Fishing Knots — which knot for which line · signed off by AI editorial review (Sprint 57) — stages checked against the RBFF transcribed steps, PNG rendered and inspected on 2026-08-19
Describe this diagram in words
Four stacked panels showing a double surgeon's knot tied between a main line and a leader. Panel one shows the two lines laid alongside each other and overlapping along the middle of the figure, one running in from the left and one from the right, with a note that the overlap is about twenty centimetres. Panel two shows the overlapped pair treated as a single doubled line, formed into a loop, with both free ends passing through that loop together for the first time and crossing in front of the near side of it. Panel three shows the same loop with the same two ends passing through it a second time, entering in front of the same strand and emerging behind the far side, with an arrow indicating that the second pass follows the same direction as the first. Panel four shows the finished knot drawn down into a small even barrel with four ends leaving it — a standing line and a trimmed tag on each side — and arrows on both standing lines indicating that the knot is drawn up by pulling all four ends at once after wetting.
How this drawing was produced
Built in Sprint 57 with the double surgeon's knot record. The drawing carries two things prose does not: the overlapped pair is handled as ONE doubled line from stage two, and the finished knot has FOUR ends, all pulled. Stage four draws both tags and arrows both standing lines because the stated failure mode is tightening from two ends instead of four. RENDERED AND INSPECTED, WHICH FOUND ONE DEFECT: the stage-three arrow originally struck through its own caption — the exact fault Sprint 54 found on six of nine figures — and was moved clear of the label band. ONE SIMPLIFICATION IS DELIBERATE AND RECORDED RATHER THAN HIDDEN: stages two and three draw the two passing ends as a single strand, because two near-parallel dashed strands through a loop this size render as a smudge. The captions carry the count; the drawing carries the topology.
Finishing it properly
- Wet before drawing up. This knot tightens a lot of material against itself at once and a dry draw burns the line at the point that will carry the load.
- Pull all four ends. This is the single instruction people skip, and it is the one the knot depends on.
- Trim both tags close but not flush — a millimetre or two allows a fraction of slip under shock without the knot opening.
- Add the third turn in braid rather than adding turns to a blood knot; a slick material needs more wrapped length, and this is the cheap way to get it.
How it fails
It fails by being tightened from two ends instead of four. Pulling only the two standing lines leaves the tags slack inside the knot, the turns bed unevenly, and the join draws down crooked — it then slips progressively under sustained load rather than breaking cleanly, so the first sign is usually a leader that has grown longer since it was tied. The inspection is the barrel itself: even, symmetrical, four ends leaving it at the same angle. A knot with one turn riding over another has bedded wrong and should be cut off rather than fished.
Where it is the wrong answer, which is one place and an important one
A knot this tolerant invites being used for everything, and there is one connection where that is a mistake with consequences beyond a lost fish.
THE BEACH SHOCK LEADER IS THE EXCEPTION. That join sits on the spool at the start of a cast and travels out through every rod ring at the fastest speed anything in fishing reaches, with several ounces of lead behind it. The requirement there is a join that is SLIM AND TAPERED, and a surgeon's is neither — it is a compact barrel with four ends leaving it, and the tags leave it at an angle rather than lying along the line.
WHAT HAPPENS IF IT CATCHES is not a lost fish. The leader fails at the ring and the lead separates in mid-air, travelling a very long way downrange. That is the reason `albright-knot` exists in this catalogue and the reason the wrapped family is the answer for shock leaders specifically.
THE SECOND, MILDER CASE IS ANYWHERE A JOIN RUNS THROUGH THE RINGS REPEATEDLY. Long-range lure fishing where the leader join is retrieved inside the tip on every cast will wear a bulky join and knock it against the ring thousands of times a session. It works, and it is noisier and rougher than the alternatives, and the join needs checking far more often.
EVERYWHERE ELSE THE TOLERANCE WINS. A fly tippet, a hooklength, a boat trace, a leader that lives outside the rod: none of those requires the join to travel, and all of them benefit from a knot that can be tied in the dark without counting turns.
THE TEST IS THE SAME ONE THE CATALOGUE APPLIES TO EVERY JOIN. Draw it back and forth through the tip ring by hand before the first cast. If it clicks, it is the wrong knot for that connection — not a badly tied one.
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.
- Fishing Knots — which knot for which line — Vermont Fish & Wildlife Department (Government fisheries body)Relied on for: A state wildlife agency grouping knots by the job they do, and stating that the surgeon's knot joins lines regardless of line diameter or line type — which is the property that separates it from the blood knot.States this directlyPassage read and verified
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Long-running published description of British sea angling practice, including shock leaders, trace construction and the dropper loops a multi-hook trace is built from.FishingHQ's interpretation of what it saysCitation checked — the work exists and is described correctly
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comprehensive angling practice: filling a reel, leader and dropper construction, and the connections each arrangement is made with.States this directlyCitation checked — the work exists and is described correctly
Where to go next
Where it is used
- Dry fly fishingChanging tippet is the commonest operation in dry fly fishing — a fly refused, a tippet shortened by three fly changes, a fish broken off — and this is the join that can be made quickly enough to do it without losing the rise.
- NymphingNymphing leaders are rebuilt constantly as depth and weight change, and the join between sections is remade every time. Speed and indifference to a diameter step matter more here than the last few percent of strength.
- Stillwater fly fishingUsed both for tippet and for building the dropper sections of a leader carrying a team of flies, where several joins of stepped diameter are made in one leader.
What these connections rest on (3)
Practitioner consensus — 3 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.
Dry fly fishing
An arrangement joined to the knot that actually builds it, written where the knot is characteristic of that arrangement rather than merely possible in it. This is the edge a reader travels: they arrive looking for the arrangement and need the connection it depends on.
- How to Tie Fishing Knots — uni, blood, improved blood, surgeon's and loop knots — Recreational Boating & Fishing Foundation (Take Me Fishing) (Angling or fisheries organisation)Relied on for: The double surgeon's knot sequence, and the grouping of knots by the connection each is for.States this directlyPassage read and verified
- Fishing Knots — which knot for which line — Vermont Fish & Wildlife Department (Government fisheries body)Relied on for: A state wildlife agency grouping knots by job and stating that the surgeon's knot joins lines regardless of diameter or line type.States this directlyPassage read and verified
- Still Water Fly-Fishing — Andre Deutsch, 1952 (Specialist angling publication)Relied on for: Stillwater fly practice: leader construction, teams of flies on droppers, and the joins between backing, fly line, leader and tippet.States this directlyCitation checked — the work exists and is described correctly
- Trout & Salmon — Bauer Media (Specialist angling publication)Relied on for: British game angling practice, including leader and tippet construction and the fly-line connections it rests on.States this directlyCitation checked — the work exists and is described correctly
Nymphing
An arrangement joined to the knot that actually builds it, written where the knot is characteristic of that arrangement rather than merely possible in it. This is the edge a reader travels: they arrive looking for the arrangement and need the connection it depends on.
- Still Water Fly-Fishing — Andre Deutsch, 1952 (Specialist angling publication)Relied on for: Stillwater fly practice: leader construction, teams of flies on droppers, and the joins between backing, fly line, leader and tippet.States this directlyCitation checked — the work exists and is described correctly
- Trout & Salmon — Bauer Media (Specialist angling publication)Relied on for: British game angling practice, including leader and tippet construction and the fly-line connections it rests on.States this directlyCitation checked — the work exists and is described correctly
- How to Tie Fishing Knots — uni, blood, improved blood, surgeon's and loop knots — Recreational Boating & Fishing Foundation (Take Me Fishing) (Angling or fisheries organisation)Relied on for: The double surgeon's knot sequence, and the grouping of knots by the connection each is for.States this directlyPassage read and verified
- Fishing Knots — which knot for which line — Vermont Fish & Wildlife Department (Government fisheries body)Relied on for: A state wildlife agency grouping knots by job and stating that the surgeon's knot joins lines regardless of diameter or line type.States this directlyPassage read and verified
Stillwater fly fishing
An arrangement joined to the knot that actually builds it, written where the knot is characteristic of that arrangement rather than merely possible in it. This is the edge a reader travels: they arrive looking for the arrangement and need the connection it depends on.
- Still Water Fly-Fishing — Andre Deutsch, 1952 (Specialist angling publication)Relied on for: Stillwater fly practice: leader construction, teams of flies on droppers, and the joins between backing, fly line, leader and tippet.States this directlyCitation checked — the work exists and is described correctly
- Trout & Salmon — Bauer Media (Specialist angling publication)Relied on for: British game angling practice, including leader and tippet construction and the fly-line connections it rests on.States this directlyCitation checked — the work exists and is described correctly
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comprehensive angling practice: reel filling, leader and dropper construction, and the connections each arrangement rests on.States this directlyCitation checked — the work exists and is described correctly
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical coarse angling practice: hooklengths, loops, droppers and the terminal arrangements built from them.States this directlyCitation checked — the work exists and is described correctly
What it joins
- Fluorocarbon leadersFluorocarbon is stiff and hard, which is exactly where a blood knot's requirement for two lines to bed evenly against each other is hardest to satisfy. A surgeon's treats the pair as one doubled line and sidesteps it, and the third turn is added for the same reason.
- Fly leaders and tippetThe standard tippet join in practice, and the reason is the one Vermont Fish & Wildlife states: it does not care about the diameter step between a leader butt and a fine tippet, where a blood knot does. It is also the join that gets tied in failing light at the end of a session, which is when tippet actually gets changed.
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.
Fluorocarbon leaders
An arrangement joined to the knot that actually builds it, written where the knot is characteristic of that arrangement rather than merely possible in it. This is the edge a reader travels: they arrive looking for the arrangement and need the connection it depends on.
- How to Tie Fishing Knots — uni, blood, improved blood, surgeon's and loop knots — Recreational Boating & Fishing Foundation (Take Me Fishing) (Angling or fisheries organisation)Relied on for: The double surgeon's knot sequence, and the grouping of knots by the connection each is for.States this directlyPassage read and verified
- Fishing Knots — which knot for which line — Vermont Fish & Wildlife Department (Government fisheries body)Relied on for: A state wildlife agency grouping knots by job and stating that the surgeon's knot joins lines regardless of diameter or line type.States this directlyPassage read and verified
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: British sea angling practice: shock leaders, multi-hook trace construction and the dropper loops a trace is built from.FishingHQ's interpretation of what it saysCitation checked — the work exists and is described correctly
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated descriptions of established connection convention, recorded as practitioner consensus rather than as scholarship.Background and mechanism onlyCitation checked — the work exists and is described correctly
Fly leaders and tippet
An arrangement joined to the knot that actually builds it, written where the knot is characteristic of that arrangement rather than merely possible in it. This is the edge a reader travels: they arrive looking for the arrangement and need the connection it depends on.
- How to Tie Fishing Knots — uni, blood, improved blood, surgeon's and loop knots — Recreational Boating & Fishing Foundation (Take Me Fishing) (Angling or fisheries organisation)Relied on for: The double surgeon's knot sequence, and the grouping of knots by the connection each is for.States this directlyPassage read and verified
- Fishing Knots — which knot for which line — Vermont Fish & Wildlife Department (Government fisheries body)Relied on for: A state wildlife agency grouping knots by job and stating that the surgeon's knot joins lines regardless of diameter or line type.States this directlyPassage read and verified
- Still Water Fly-Fishing — Andre Deutsch, 1952 (Specialist angling publication)Relied on for: Stillwater fly practice: leader construction, teams of flies on droppers, and the joins between backing, fly line, leader and tippet.States this directlyCitation checked — the work exists and is described correctly
- Trout & Salmon — Bauer Media (Specialist angling publication)Relied on for: British game angling practice, including leader and tippet construction and the fly-line connections it rests on.States this directlyCitation checked — the work exists and is described correctly
Worth understanding first
- Choosing a knot for the line you are usingThe material rule applied: the third turn exists because braid is slick and needs more wrapped length, and it is left out in ordinary monofilament where it adds only bulk. The knot does not change; the number of turns does, and the material decides it.
- Joining two lines: what the join has to surviveThat record names diameter mismatch as the first thing that makes a join fail, and names the blood-type family as the answer for SIMILAR materials. This is the knot for the case it excludes, and Vermont Fish & Wildlife states the property directly: it joins lines regardless of diameter or line type.
- Wetting, seating and tag ends: the three things that decide whether a knot holdsA worked example of that record's argument. This knot beds a large amount of material against itself in one movement and is drawn up from four ends at once, so a dry draw and an uneven pull are both more consequential here than on a knot with fewer turns.
What these connections rest on (3)
Practitioner consensus — 3 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.
Choosing a knot for the line you are using
A knot joined to the explainer that sets out the principle it is an instance of. The explainers were written first and each names families of solution; these edges are what let a reader move from the principle to a knot that embodies it.
- How to Tie Fishing Knots — uni, blood, improved blood, surgeon's and loop knots — Recreational Boating & Fishing Foundation (Take Me Fishing) (Angling or fisheries organisation)Relied on for: The double surgeon's knot sequence, and the grouping of knots by the connection each is for.States this directlyPassage read and verified
- Fishing Knots — which knot for which line — Vermont Fish & Wildlife Department (Government fisheries body)Relied on for: A state wildlife agency grouping knots by job and stating that the surgeon's knot joins lines regardless of diameter or line type.States this directlyPassage read and verified
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comprehensive angling practice: reel filling, leader and dropper construction, and the connections each arrangement rests on.States this directlyCitation checked — the work exists and is described correctly
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical coarse angling practice: hooklengths, loops, droppers and the terminal arrangements built from them.States this directlyCitation checked — the work exists and is described correctly
Joining two lines: what the join has to survive
A knot joined to the explainer that sets out the principle it is an instance of. The explainers were written first and each names families of solution; these edges are what let a reader move from the principle to a knot that embodies it.
- How to Tie Fishing Knots — uni, blood, improved blood, surgeon's and loop knots — Recreational Boating & Fishing Foundation (Take Me Fishing) (Angling or fisheries organisation)Relied on for: The double surgeon's knot sequence, and the grouping of knots by the connection each is for.States this directlyPassage read and verified
- Fishing Knots — which knot for which line — Vermont Fish & Wildlife Department (Government fisheries body)Relied on for: A state wildlife agency grouping knots by job and stating that the surgeon's knot joins lines regardless of diameter or line type.States this directlyPassage read and verified
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comprehensive angling practice: reel filling, leader and dropper construction, and the connections each arrangement rests on.States this directlyCitation checked — the work exists and is described correctly
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical coarse angling practice: hooklengths, loops, droppers and the terminal arrangements built from them.States this directlyCitation checked — the work exists and is described correctly
Wetting, seating and tag ends: the three things that decide whether a knot holds
A knot joined to the explainer that sets out the principle it is an instance of. The explainers were written first and each names families of solution; these edges are what let a reader move from the principle to a knot that embodies it.
- How to Tie Fishing Knots — uni, blood, improved blood, surgeon's and loop knots — Recreational Boating & Fishing Foundation (Take Me Fishing) (Angling or fisheries organisation)Relied on for: The double surgeon's knot sequence, and the grouping of knots by the connection each is for.States this directlyPassage read and verified
- Fishing Knots — which knot for which line — Vermont Fish & Wildlife Department (Government fisheries body)Relied on for: A state wildlife agency grouping knots by job and stating that the surgeon's knot joins lines regardless of diameter or line type.States this directlyPassage read and verified
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comprehensive angling practice: reel filling, leader and dropper construction, and the connections each arrangement rests on.States this directlyCitation checked — the work exists and is described correctly
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical coarse angling practice: hooklengths, loops, droppers and the terminal arrangements built from them.States this directlyCitation checked — the work exists and is described correctly
Instead of this
- Albright knotBoth handle a diameter mismatch and only one of them will pass through rings under a heavy cast. The Albright takes several times longer to tie and is easier to get wrong; the surgeon's can be tied in seconds in the dark. That is the whole choice, and it is decided by whether the join has to travel.
- Blood knotThe same job with the opposite trade-off. A blood knot is slimmer, more symmetrical and better through the rings, and it wants two lines of similar diameter. A surgeon's is quicker, tolerates any diameter step and any material pairing, and is bulkier. Where the diameters match and the join must travel through rings, the blood knot is the better answer; almost everywhere else the surgeon's is.
What these connections rest on (2)
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.
Albright knot
Both are line-to-line joins for mismatched diameters, and practitioner literature separates them consistently on profile and on the time each takes to tie rather than on strength.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: British sea angling practice: shock leaders, multi-hook trace construction and the dropper loops a trace is built from.FishingHQ's interpretation of what it saysCitation checked — the work exists and is described correctly
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated descriptions of established connection convention, recorded as practitioner consensus rather than as scholarship.Background and mechanism onlyCitation checked — the work exists and is described correctly
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comprehensive angling practice: reel filling, leader and dropper construction, and the connections each arrangement rests on.States this directlyCitation checked — the work exists and is described correctly
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical coarse angling practice: hooklengths, loops, droppers and the terminal arrangements built from them.States this directlyCitation checked — the work exists and is described correctly
Authoritative guidance — 1 connection
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
Blood knot
Two state and national fishing-education sources group these knots as answers to the same question and separate them on the diameter constraint — the blood knot working best with lines of similar diameter, the surgeon's joining lines regardless of diameter or type.
- How to Tie Fishing Knots — uni, blood, improved blood, surgeon's and loop knots — Recreational Boating & Fishing Foundation (Take Me Fishing) (Angling or fisheries organisation)Relied on for: The double surgeon's knot sequence, and the grouping of knots by the connection each is for.States this directlyPassage read and verified
- Fishing Knots — which knot for which line — Vermont Fish & Wildlife Department (Government fisheries body)Relied on for: A state wildlife agency grouping knots by job and stating that the surgeon's knot joins lines regardless of diameter or line type.States this directlyPassage read and verified
History and culture
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.
Nylon, and what synthetic line changed
A knot joined to the material transition that produced or transformed it. Written where the knot is genuinely an artefact of synthetic line rather than merely contemporary with it, which is why the wire termination in this file does not carry it.
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comprehensive angling practice: reel filling, leader and dropper construction, and the connections each arrangement rests on.States this directlyCitation checked — the work exists and is described correctly
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical coarse angling practice: hooklengths, loops, droppers and the terminal arrangements built from them.States this directlyCitation checked — the work exists and is described correctly
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: British sea angling practice: shock leaders, multi-hook trace construction and the dropper loops a trace is built from.FishingHQ's interpretation of what it saysCitation checked — the work exists and is described correctly
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated descriptions of established connection convention, recorded as practitioner consensus rather than as scholarship.Background and mechanism onlyCitation checked — the work exists and is described correctly
Sources for this page
- How to Tie Fishing Knots — uni, blood, improved blood, surgeon's and loop knots — Recreational Boating & Fishing Foundation (Take Me Fishing) (Angling or fisheries organisation)Relied on for: The double surgeon's knot set out in full: overlap the two lines, pass the leader and the tag through a loop to form an overhand knot, pass the same ends through a second time, then moisten and tighten by pulling all four ends. Read in full and passage-verified during the Sprint 41 knot-reference search.States this directlyPassage read and verified
- Fishing Knots — which knot for which line — Vermont Fish & Wildlife Department (Government fisheries body)Relied on for: A state wildlife agency grouping knots by the job they do, and stating that the surgeon's knot joins lines regardless of line diameter or line type — which is the property that separates it from the blood knot.States this directlyPassage read and verified
- Still Water Fly-Fishing — Andre Deutsch, 1952 (Specialist angling publication)Relied on for: Stillwater fly practice: leader construction, teams of flies on droppers, and the joins between backing, fly line, leader and tippet.States this directlyCitation checked — the work exists and is described correctly
- Trout & Salmon — Bauer Media (Specialist angling publication)Relied on for: Long-running published description of British game angling practice, including leader and tippet construction and the fly-line connections it rests on.States this directlyCitation checked — the work exists and is described correctly
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comprehensive angling practice: filling a reel, leader and dropper construction, and the connections each arrangement is made with.States this directlyCitation checked — the work exists and is described correctly
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