Chub vs Ide
How to tell them apart, and what follows from getting it right.
Why they get confused
The genuine identification problem of continental European coarse fishing, and the one that catches British anglers abroad. Both are deep silvery cyprinids of similar size with reddish lower fins, they share rivers throughout the overlap, and they hybridise — so intermediate fish exist and defeat every character below.
Chub
Squalius cephalus — Leuciscidae
Ide
Leuciscus idus — Leuciscidae
The differences
Each difference is marked with how far it can be trusted on its own. A single diagnostic character settles the identification; suggestive ones only narrow it.
| Character | Chub | Ide | Reliability |
|---|---|---|---|
| Margin of the anal finIdentification | Distinctly convex — the outer edge bulges outward in a curve. | Straight or slightly concave. | Diagnostic on its own |
| Size of the mouthIdentification | Large and wide, extending back to below the front of the eye, with thick pale lips. | Small and slightly oblique, not reaching back under the eye. | Diagnostic on its own |
| Head and body proportionIdentification | Large blunt head on a rounded, cylindrical body. | Small head on a deeper, more laterally compressed body. | Supporting — use with others |
| Scale edgingIdentification | Scales conspicuously dark-edged, giving a strong net pattern along the flank. | Scale edging finer and less contrasting. | Suggestive only — varies |
| Where in the riverRange | Widespread through fast and moderate flows, holding tight to cover. | More often in deeper, slower reaches and lower rivers, and tolerant of brackish water. | Suggestive only — varies |
Why it matters
For record claims and for honest reporting more than for anything practical, since the two are fished for similarly. The pair is also the clearest demonstration on this site of a comparison that cannot always be resolved: where chub and ide hybridise, the anal fin margin and the mouth are intermediate, and the correct answer for such a fish is that it cannot be named with confidence.
The full records
This page compares two species. Each of them has a complete record covering biology, behaviour, handling and the evidence behind all of it.
More about chub
Where it lives, how it is caught, and what else it is confused with.
Similar and related fish
What these connections rest on (1)
Scientific evidence — 1 connection
Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.
Ide
An identification comparison naming both binomials: Leuciscus idus and Squalius cephalus.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Morphological and distributional data for Leuciscus idus and for Squalius cephalus.States this directlyPassage read and verified
- The IUCN Red List of Threatened Species — International Union for Conservation of Nature (Conservation authority)Relied on for: Separate assessments treating Leuciscus idus and Squalius cephalus as distinct species.States this directlyCitation checked — the work exists and is described correctly
How it is caught
- Float fishingTrotting a float down a run covers the length of a swim and presents a bait moving at the pace of the current, which is how a chub expects its food to arrive.
- LedgeringThe standard winter approach: a chub in cold water holds deep under cover and will not move far, so the bait goes to the fish rather than the fish coming to the bait.
- SpinningChub take small lures readily, and spinning is how a river's chub lies are covered quickly on a walk rather than one swim at a time.
- Surface fishing for coarse fishA river fish that takes floating bread and terrestrial insects readily, frequently at ranges of a few metres under overhanging cover.
- TrottingHolds in and beside the current under structure and takes a trotted bait confidently, which makes it the species a beginner most often catches first on a river.
What these connections rest on (5)
Practitioner consensus — 5 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.
Float fishing
Established angling practice for this species, recorded as convention. The note states the property of the animal or its water that makes the method the answer.
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Established coarse-angling technique and its application to the species.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary British coarse practice for this species.Background and mechanism onlyCitation checked — the work exists and is described correctly
Ledgering
Established angling practice for this species, recorded as convention. The note states the property of the animal or its water that makes the method the answer.
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Established coarse-angling technique and its application to the species.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary British coarse practice for this species.Background and mechanism onlyCitation checked — the work exists and is described correctly
Spinning
Established angling practice for this species, recorded as convention. The note states the property of the animal or its water that makes the method the answer.
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Established coarse-angling technique and its application to the species.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary British coarse practice for this species.Background and mechanism onlyCitation checked — the work exists and is described correctly
Surface fishing for coarse fish
That a species is conventionally fished for by this method, drawn from angling literature and from widely restated practitioner description rather than from testing.
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical British coarse angling practice: river float work, shotting, bait delivery and the reels and rods used for each.States this directlyCitation checked — the work exists and is described correctly
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comprehensive British freshwater angling practice including river float fishing, surface presentation and the equipment for each.States this directlyCitation checked — the work exists and is described correctly
Trotting
That a species is conventionally fished for by this method, drawn from angling literature and from widely restated practitioner description rather than from testing.
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical British coarse angling practice: river float work, shotting, bait delivery and the reels and rods used for each.States this directlyCitation checked — the work exists and is described correctly
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Comprehensive British freshwater angling practice including river float fishing, surface presentation and the equipment for each.States this directlyCitation checked — the work exists and is described correctly
Gear for this fish
- HooksChub have hard mouths and are frequently fished with large baits in current, which pushes hook choice towards a strong wide-gape pattern rather than a fine-wire one.
- Luncheon meatWidely used for chub for the same reasons it suits barbel, and often fished on the bottom in the same swims.
- Running legerA chub in flowing water takes a static bait cautiously and drops it the moment it feels resistance, which is the situation a running arrangement exists for.
- SpinnersA small spinner fished downstream past a known lie takes chub because they hold facing flow and intercept, and it is the traditional method of covering a river's chub in a single walk.
- Stick float rigTrotted baits down a chub swim are one of the standard river approaches, and the float allows the bait to be presented far down a swim the angler could not otherwise reach without disturbing it.
- Surface controller rigChub take floating baits confidently and are frequently fished for with a controller on rivers, where the float also carries the bait downstream to fish that cannot be approached.
- Surface luresChub feed opportunistically at the surface on anything that falls in — fruit, beetles, small mammals — and will take a small surface lure worked under overhanging cover for exactly that reason. It is a stalking fishery rather than a searching one.
What these connections rest on (7)
Practitioner consensus — 7 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.
Hooks
Hook requirement for a species is angling convention, reported consistently across independent coarse-angling sources.
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical coarse angling practice: baits, terminal arrangements, presentation and swim selection for river species.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK coarse angling practice as reported by practitioners, including rig and tackle convention.States this directlyCitation checked — the work exists and is described correctly
Luncheon meat
Established angling convention about what a bait is used for. Convention is what this is, and labelling it as convention is what stops it being read as a tested result.
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical coarse angling practice: baits, presentation, swim selection and the reasoning behind them.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK coarse and match angling practice as reported by practitioners, including bait convention and rig use.Background and mechanism onlyCitation checked — the work exists and is described correctly
Running leger
Terminal arrangement for a species is angling convention, reported consistently by independent practitioner sources across the classical and contemporary coarse literature.
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical coarse angling practice: baits, terminal arrangements, presentation and swim selection for river species.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK coarse angling practice as reported by practitioners, including rig and tackle convention.States this directlyCitation checked — the work exists and is described correctly
Spinners
A practitioner claim about which lure family answers this species' feeding or holding behaviour.
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Lure and spinning practice for freshwater predators in Britain and northern Europe.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary British and European lure practice for this species in the weekly angling press.Background and mechanism onlyCitation checked — the work exists and is described correctly
Stick float rig
That anglers conventionally choose this arrangement when targeting this fish. It is a claim about practice rather than about the fish, and it does not assert that the arrangement is necessary or that it will succeed.
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical coarse angling practice: terminal arrangements, shotting, float attachment and bite registration in still and running water.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK coarse and match angling practice as reported by practitioners, including pole, float and surface rig convention.States this directlyCitation checked — the work exists and is described correctly
Surface controller rig
That anglers conventionally choose this arrangement when targeting this fish. It is a claim about practice rather than about the fish, and it does not assert that the arrangement is necessary or that it will succeed.
- Coarse Fishing — A. & C. Black, 1912 (Specialist angling publication)Relied on for: Classical coarse angling practice: terminal arrangements, shotting, float attachment and bite registration in still and running water.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK coarse and match angling practice as reported by practitioners, including pole, float and surface rig convention.States this directlyCitation checked — the work exists and is described correctly
Surface lures
A practitioner claim about which lure family answers this species' feeding or holding behaviour.
- Freshwater Fishing — Macdonald & Jane's, 1975 (Specialist angling publication)Relied on for: Lure and spinning practice for freshwater predators in Britain and northern Europe.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary British and European lure practice for this species in the weekly angling press.Background and mechanism onlyCitation checked — the work exists and is described correctly
Where it lives
What these connections rest on (1)
Scientific evidence — 1 connection
Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.
Lowland rivers
A habitat claim held to an authoritative standard because it is about where a species is actually found rather than about how to catch it.
- Freshwater Fishes of the British Isles — HarperCollins (New Naturalist 75), 1992 (Reference work)Relied on for: Habitat use of Squalius cephalus in European rivers.States this directlyCitation checked — the work exists and is described correctly
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded habitat for Squalius cephalus.States this directlyPassage read and verified
Reviewed 2026-08-13. FishingHQ does not state what any rule is or where any rule applies. Where this page says the two species are managed differently, that is a reason to check the authority for the water you are on — not a statement of what it requires.