Ide and Orfe: The Ruler and the Diet
The last article in this series was about one word covering three stocks. This one is about a fish where everything is unambiguous — one species, one name in the regulation, no argument in the taxonomy — and where a number nevertheless sits in the wrong place. The Saxon fisheries regulation releases the ide from 20 centimetres. A Swedish study of 1,163 ide finds fry in the stomach only from 260 millimetres. Six centimetres lie between the two, and inside them the rulebook’s coarse fish turns into something else. The pole of this article is therefore: the ruler and the diet cross — but not at the same point.
Twenty centimetres — and six later, fish is on the menu
In the Sächsische Fischereiverordnung of 22 April 2022 the ide sits at number 3, and the line is short: “Aland [Leuciscus idus]”, closed season “–”, minimum size 20. In the fisheries order of the state of Brandenburg of 14 November 1997 the same line reads “Aland (Leuciscus idus) keine 30” — no closed season either, but thirty centimetres instead of twenty. Beside them sits a figure from the literature that has nothing to do with either ruler. The Åtgärdsprogram för vimma och id of the Swedish Agency for Marine and Water Management (Report 2023:1) reports a study of 1,163 ide from the Kävlingeån and records two shifts in diet: one at about 20 millimetres, one at about 140. And then comes the sentence this article turns on: “Fiskyngel återfanns endast i individer som var 260 mm eller längre.” Fry were found exclusively in fish of 260 millimetres or longer. In the same passage, from that same mark insects were “ratades nästan helt och ersattes med växter” — almost entirely rejected and replaced by plants. ⚠️ Two limits belong here immediately, or the finding does not hold. First: the same programme calls both species it covers “omnivorer” — omnivores. The ide is not a predator, and this article never calls it one. Second: this is one study, one river, one year. That is precisely why the number works as a rule of thumb and not as a law of nature. ⚠️ And still the order of magnitude holds: in Saxony an ide may be taken at 20 cm, and at that length it is still largely the coarse fish the column takes it for. From about 26 it begins to be the other thing as well. A minimum size is set for many reasons, not only from stomach contents — the point is not that the number is wrong. The point is that the two lines cross and nobody has marked the crossing.
The spawning run follows the pike — and the calendar stays open
The same programme describes the spawning run in a sentence that concerns every spring angler: “Idlek sammanfaller ofta i tid med lekaktivitet från gädda och på platser där mörten leker.” Ide spawning often coincides in time with the spawning activity of the pike, in places where roach spawn too. Alongside it: “Id leker mars till juni”, March to June depending on water temperature, and “Fisken leker under någon vecka” — the spawning act itself lasts about a week. Males run ahead of the females, and Swedish tradition had its own words for the waves: the early run was called isfisk, tjälid or strömid, the late one ängsid. The programme states explicitly that this is “Ett mönster och namngivning som man också använt för att beskriva gäddans lekvandring” — the same pattern and the same naming used for the pike’s spawning run. ⚠️ Now put the lines side by side. In Saxony the pike is closed from 1 February to 30 April, the asp from 1 January to 31 May, the pikeperch from 1 February to 31 May, the barbel from 15 April to 30 June. In Brandenburg the pike is closed for angling from 1 February to 31 March, the asp from 1 April to 30 June. The ide runs up the same tributary in the same weeks — “från minsta dike till största älv”, from the smallest ditch to the largest river — and in both states its column reads “–” or “keine”. It is then especially easy to find, because it moves in larger shoals and spawns over shallow stone and gravel down to about 1.5 metres. And one last sentence separates it from the fish that fish passes get built for: the ide is one of the “svagsimmande fiskarterna”, the weak-swimming species that “inte klarar hinder genom kraftfulla hopp eller klättring” — no leaping, no climbing. A drop a trout clears is a wall to it. Which is exactly why in spring it stands below the weir and not above it.
The ornamental form ate its name
And then there is the name — and here the trap is built differently from the previous articles. It is not one word carrying too many fish. Here an ornamental form has pushed the wild fish out of the name register. The golden orfe is not a separate species but the orange bred form of exactly this fish; the Global Invasive Species Database describes both colour morphs side by side — silver orfe as the wild colouring and golden orfe — and names as a pathway of introduction, in so many words, “Golden orfe are valued as ornamental pond fish.” ⚠️ And where the fish is known only from the garden pond, the databases give it the name of a different ornamental fish. The GBIF vernacular list for *Leuciscus idus* (usageKey 4409643) carries Catalan “Carpa koi japonesa” — Japanese koi carp, another genus, another species — and Turkish “Japon balığı”, which in Turkish is the goldfish. Spanish gives “Cacho”, otherwise the chub; French, alongside “ide mélanote”, carries “Véron”, otherwise the minnow, and “Gardon rouge”, otherwise the roach; Portuguese gives “Escalo”, otherwise the Iberian chub. German carries Aland, Nerfling, Orfe, Goldorfe — and on top of that “Rohrkarpfen” and “Seekarpfen”, carp names for a fish that is no carp. ⚠️ For Greek, Japanese, Arabic and Albanian, neither GBIF nor WoRMS (AphiaID 154324) carries any name at all. The map explains why: GISD lists it as native in, among others, Germany, Denmark, Norway, Sweden, Finland, Poland, Czechia, Croatia, Estonia, Latvia, Lithuania, Bulgaria, Romania, Hungary, Russia and Ukraine — and as introduced in France, the Netherlands, the United Kingdom, the United States and New Zealand. The fish has no name in the south, and in the west it carries the name of its own garden-pond double.
For a German pond owner an open legal question hangs on this, which this article does not decide but only makes visible. § 40 paragraph 1 BNatSchG requires a permit for releasing animals into the wild and exempts, in sentence 4 number 3, “das Ansiedeln von Tieren, die dem Jagd- oder Fischereirecht unterliegen, sofern die Art in dem betreffenden Gebiet in freier Natur in den letzten 100 Jahren vorkommt oder vorkam” — the settling of animals subject to hunting or fisheries law, provided the species occurs or occurred in that area. ⚠️ The exemption bites at the level of species — and the golden orfe is the same species as the ide in the river. Whether a bred colour form is covered is something the statutory text does not answer; the fisheries law of each state regulates stocking separately and in its own right, and § 40 paragraph 3 expressly allows the authority to remove animals released without permission or escaped. Anyone with a garden pond beside running water does not have that legal question on a shelf. They have it on the bank.
- From about 26 centimetres the small artificial lure earns its place. The Kävlingeån study found fry only in fish from 260 mm; below that insects dominate, and from around 140 mm increasingly plants. A 20 cm ide is no candidate for a streamer, a 40 cm one will take small lures — and stays an omnivore regardless.
- No closed season does not mean no consequences. It runs up the tributary in shoals from March to June, spawns shallow over stone and gravel down to about 1.5 metres, and the act lasts roughly a week. Catching fish after fish there in spring means fishing into the spawning run — even with an empty column.
- The ruler changes at the state line. Saxony 20 cm, Brandenburg 30 cm, both without a closed season. What applies is the regulation of the state you are standing in — not the neighbour’s and not this article. The other fourteen German states are deliberately left open here, not asserted.
- It is the most salt-tolerant of the cyprinids. Up to about 15 parts per thousand; GISD calls it more salinity-tolerant than any other cyprinid fish. In the Baltic you meet it in brackish water where no relative of its stands. Its sperm, though, runs into trouble above 7 to 8 parts per thousand according to the programme — which is why the spawning ground is fresh water even when the fish feeds further out.
- A 45 cm ide is not big, it is old. Sexual maturity at five to seven years, lifespan generally ten to fifteen, the oldest of 433 fish in the Kävlingeån fourteen — and an Estonian otolith age from Saunja laht of 29 years. The Swedish rod record stands at 3,780 g and 61.5 cm; 30 to 55 cm is the usual range.
- No leap, no climb. It does not force obstacles. In spring look for it below weirs, drops and sills — that is where the whole run banks up, and that is exactly where an open calendar leaves it most exposed.
And now the paperwork, because this article stands or falls on it. Law: Sächsische Fischereiverordnung — SächsFischVO of 22 April 2022, annex “Schonzeiten und Mindestmaße”, no. 3 “Aland [Leuciscus idus] – 20”, alongside no. 19 pike 1 February to 30 April / 50, no. 30 asp 1 January to 31 May / 40, no. 44 pikeperch 1 February to 31 May / 50, no. 9 barbel 15 April to 30 June / 50. Fischereiordnung des Landes Brandenburg (BbgFischO) of 14 November 1997 (GVBl. II 1997, p. 867), last amended by regulation of 10 September 2009 (GVBl. II 2009, p. 606): “Aland (Leuciscus idus) keine 30”, pike for angling 1 February to 31 March / 45, pikeperch 1 April to 31 May / 45, asp 1 April to 30 June / 40. § 40 BNatSchG, paragraphs 1 and 3, in the version on gesetze-im-internet.de. All three pulled directly on 6 September 2026. Biology: Havs- och vattenmyndigheten, Report 2023:1, “Åtgärdsprogram för vimma och id”, decided 30 January 2023 (Dnr 946-21), valid 2023–2027, prepared by Tobias Borger, Länsstyrelsen Kalmar län; the programme describes itself as “ett vägledande ej formellt bindande dokument”, a guiding, not formally binding document. Source of every figure here on diet, spawning season, spawning ground, migration, age, size and salinity tolerance; the dietary shifts go back there to Cala 1970 b (1,163 fish, Kävlingeån), the age of 29 years to Rothla et al. 2015. Taxonomy: GBIF API, resolved on 6 September 2026 — *Leuciscus idus* (Linnaeus, 1758), usageKey 4409643, rank SPECIES, status ACCEPTED, matchType EXACT, confidence 99, family Cyprinidae (familyKey 7336), order Cypriniformes (orderKey 1153); WoRMS AphiaID 154324. Range and ornamental trade: Global Invasive Species Database, iucngisd.org, retrieved 6 September 2026. ⚠️ Three things this article deliberately does not claim: that the ide is a predator — the source says “omnivorer”; that a 20 cm minimum size is wrongly set — minimum sizes serve several purposes, not only stomach contents; and anything about the fourteen German states not checked here. Regulations also change — check the version in force before your fishing day, not this article.
Not the drawer — the fish
With this fish what decides is not the column it sits in but what is actually moving in front of you — and no regulation answers that. An ide day is a question of water temperature, level, clarity, season and whether the run has started — and alongside that, of everything that changes by the hour: air pressure, wind, current and light phase. That is exactly what the StrikeAhead app is built for: it reads your water with bite windows, weather and water data, chart and depth contours, and it learns from your catches so you fish the moment instead of guessing it. And because on a strange river half the answer is knowing which riffle below which weir banks up the run, and which line of the local regulation applies to your fish, the second half is the shortcut — that knowledge is on no chart, it sits in someone’s head. The app tells you when. StrikeAhead Pathfinder tells you with whom: our curated directory of fishing guides and skippers — every expert personally vetted, licence and insurance checked before listing, profiles built from real, verified catches in the StrikeAhead logbook rather than from marketing photos, no paid ranking, and no booking fee for you as an angler.