The FIPS-Mouche rules, explained for anglers who do not compete (yet)

The FIPS-Mouche rules are the rules of international fly fishing competition. In short: one fly rod of 7 ft 6 in to 12 ft (229 to 366 cm), a real fly line at least 0.55 mm thick and 22 m long, one leader no longer than twice the rod, nothing added to the line or leader that floats or sinks, up to three flies at least 50 cm apart, weight hidden in the dressing or in one bead of 4 mm at most, barbless single hooks, a knotless net, and a fish counts only when it is hooked in the mouth, netted in the water and measured by a controller. The winner is the angler with the lowest sum of session placings. I have fished competitions for more than ten years, and I teach rigging to these rules in competition training. This article explains them, with the article numbers, for anglers who have never read them.

Who writes the FIPS-Mouche rules, and which document counts

The FIPS-Mouche rules belong to the international federation of sport fly fishing, founded in San Marino in 1989 inside CIPS, the international sport fishing confederation. The first world-level event was held in 1981 (Competition Rules 2025, background).

The document that counts is “Competition Rules 2025”, last approved by the General Assembly at Bohinj, Slovenia, in April 2025 (article 42). The latest published version applies at any international event. Each event then publishes its own “Rule Modifications”, which set the details the main rules leave open: which species count, how many flies, how many points (preamble). So there are always two documents: the rules, and the modifications for the event you are fishing.

One more thing before the figures. These are competition rules. They are not the rules of any river. On the rivers I guide in Montenegro, the fly fishing zones have their own rules, and I handle the permits for them.

The tackle rules in one table

The rod

Any conventional fly rod from 7 ft 6 in to 12 ft, one at a time (26.1). A 12 ft rod is the top of the range.

The fly line

This is the rule that surprises people. The line must be a real fly line, with a coated diameter of at least 0.55 mm and a length of at least 22 m (27.1, 27.2). A bare mono “line” is not allowed; neither is a shooting head. That is why the thin competition nymphing lines exist: they are the thinnest line the rule allows (Swentosky’s account, Troutbitten, 2020).

The leader

One leader, tippet included, no longer than twice the length of the rod (28.1). The arithmetic:

The limit does not apply in lake sectors and in dry-fly sectors, so dry-fly leaders in competition can run longer. If the leader has knots, they must be at least 30 cm apart (28.2). Up to three tippet rings of 3 mm may be used (28.4). Leader numbers in detail are in leader, sighter and tippet length and micro leaders in numbers.

Flies and hooks

Up to three flies, and the event decides whether it is one, two or three (29.5). Flies must be at least 50 cm apart, measured eye to eye with the leader hanging freely. Weight must be hidden in the dressing, with one visible bead of at most 4 mm allowed (29.2). All hooks barbless and single (29.7). Moulded or shaped plastic, silicone or rubber bodies (worms, eggs, baitfish and the like) are banned. Rubber or other round material may not reach past the bend, shank or eye of the hook, except leg imitations of 0.53 mm at most. Attractor chemicals and light emitters are banned (29.9, 29.10). The one-or-two question is in one nymph or two.

The landing net

A knotless net with a mesh of rubber or silicone (preferred), non-abrasive synthetic or soft cotton; bank nets no longer than 122 cm overall (30.1, 30.2). The fish must be landed in the net with both fish and net in the water, and passed to the controller (23.1).

Why there is no indicator and no split shot

The rules never use the words “strike indicator” for river fishing. The ban follows from article 28.3: nothing that floats or sinks may be added to the leader. Article 29.2 says all weight must be inside the fly. Put the two together and you have the euro nymphing rig: the weight is in the flies, and a coloured section of leader, the sighter, does the job a float would do. Josh Miller makes the same point in Fly Fisherman: the competition rules confine weight to the flies, which is why competition anglers change the weight of the fly rather than add shot (Miller, 2025). How heavy a fly to tie on is in how heavy should a euro nymph be. On a lake, article 29.11 also bans a floating moulded part of a fly used as an indicator.

The method itself, and how I teach it on a guided day, is in euro nymphing in Montenegro.

How a session runs: beats, controllers, the clock

• Five scoring sessions make an event (11.1). Each is at least three and at most four hours of fishing (11.2), with at least 30 minutes to rig at the beat first (11.5).
• A beat is a marked stretch of river. You may only cast and fish inside its boundaries (9.6).
• A controller stays with you in a river session. The controller’s checklist covers rod length, leader length, fly line diameter, the taper, the distance between knots, the distance between flies, additions on line or leader, droppers, barbs, the size of the flies against a gauge, and the net (20.9).
• A fish counts when it is hooked in the mouth area, in front of the rear edge of the gill cover (25), landed in the net with the net in the water, and handed to the controller (23.1). The minimum size is at least 20 cm, with species and sizes set per event (25.1).
• No practice on the venue. Nobody may fish the competition sectors in the 30 days before the event (31.1 a).

How fish are scored and how a winner is found

Each eligible fish earns points, plus points per centimetre (33.1, 33.2). The values are set by the event. Then comes the part people miss: points do not decide the winner directly. In each session, every angler gets a placing within their group: first, second, third and so on. An angler who catches nothing gets a placing equal to the number of anglers in the sector (34.1, 34.2). The winner, individual or team, is the one with the lowest sum of placings over the five sessions (35.1). A team is five anglers, with an optional reserve, captain and manager (12).

This changes how a session is fished. A blank is the worst placing you can post (34.2), so the first eligible fish of a session lifts an angler off it.

What changes from one event to the next

The Rule Modifications. The 2026 world event in Idaho Falls, as an example, set three river sessions and two lake sessions from boats; sessions of three hours; river beats of roughly 160 to 250 m, longer on one sector; 100 points per fish and 20 per centimetre; a minimum size of 20 cm; three flies, except two on one lake sector; and all practice fishing catch and release with barbless hooks (Rules Modifications, 2026). Another event might allow one fly. So before any competition, read its modifications as carefully as the rules.

Do the rules matter if you never compete?

Two honest views.

Domenick Swentosky of Troutbitten argues against them for the everyday angler. The leader limit, which he dates to 2012, forces compromises such as very thin competition fly lines, and a long mono rig fishes better for anyone not bound by the rule. In his words: “Fly line limits the performance of a tight line system.” (Troutbitten, 2020). I should say that I could not confirm the year 2012 from the rules document itself; it lists amendment years but not what changed.

The other view is thinner in print. Under that same piece one reader says he prefers a euro fly line and casts it 35 to 40 ft with heavy flies. I found no published source for the claim that the limits teach cleaner rigging, so I do not make it.

I will not take a side for you here. What I can say is that two habits the rules demand, barbless hooks and a landing net, are what I fish with on every water I guide, and the fly fishing zones here are catch and release anyway.

In the United States, local competitions described by Cortland use the same tackle rules with anglers from the other group acting as controllers and sessions of two to three hours (Komara, Cortland). That is one country’s format; your own country’s federation will have its own.

Learning to rig by the rules

Competition training is where I teach this, to anglers who have never competed and to teams; its parts are listed in euro nymphing in Montenegro. Practice sessions are fished against the clock, as in a competition. Modern competition rods and reels can be rented at an additional charge; see gear rental. If you have never held a fly rod, start with a first day instead. The rivers themselves, and the rest of the country, are in fly fishing in Montenegro: the complete guide.

Questions

How long can a leader be in a fly fishing competition?

Twice the length of the rod, tippet included: 20 ft (6.10 m) on a 10 ft rod, 22 ft (6.71 m) on an 11 ft rod. The limit does not apply in lake and dry-fly sectors (article 28.1).

How many flies can you fish?

Up to three, at least 50 cm apart eye to eye. Each event says in its Rule Modifications whether it allows one, two or three (article 29.5).

Are strike indicators allowed?

No. Nothing that floats or sinks may be added to the leader (article 28.3). The coloured sighter section of the leader is how competition anglers see the drift.

What is the biggest bead allowed?

One visible bead of at most 4 mm. Any other weight must be hidden inside the dressing and may not go past the bend or the eye of the hook (article 29.2).

Do hooks have to be barbless?

Yes. Barbless single hooks, and no tandem flies (article 29.7).

How is the winner decided?

By the lowest sum of session placings, not by total points. A blank session scores the worst placing in the sector (articles 34 and 35).

Reading the rules is one thing; rigging to them with a controller’s eye on your leader is another. If you want to learn it on the water, with the clock running, competition training is the day for it. Tell me your dates and what you want to work on, and I reply within a day. Request your dates.