How a Barbel sees your lure
Which lure colour a Barbel can actually see, at your depth and in your water. 3 cone types, peak 615 nm. Ranked contrast for 54 colours.
Barbus barbus
Measured in the same family
No spectral measurement exists for this species. The cone peaks are a family-level substitution from other cyprinids. This is a coarser assumption than a same-genus one; the broad "which end of the spectrum" answer is reliable, the fine ranking between adjacent colours is not. Its retina uses the A2 (porphyropsin) chromophore, which pushes its long-wavelength sensitivity well to the red of what an A1 retina would give. Many freshwater fish shift the A1/A2 ratio with season and temperature, so real sensitivity drifts through the year.
Spectral sensitivity
| Cone peaks | λmax | Chromophore |
|---|---|---|
| Short | 450 nm | A2 |
| Medium | 530 nm | A2 |
| Long | 615 nm | A2 |
| Rod | 528 nm | A2 |
Rods do the work at dawn, dusk and night — which is when most people fish.
Lure table
Ranked by how much each colour stands out to a Barbel in these conditions. — Clear, 3 m.
| Colour | Contrast | Seen from | Fish view | ||
|---|---|---|---|---|---|
| 1 | White | 98 | 5.0 m | Buy now | |
| 2 | Chartreuse / white Fluorescent finish | 96 | 5.0 m | Buy now | |
| 3 | Glow Glow finish — not modelled | 96 | 4.9 m | Buy now | |
| 4 | Bone | 94 | 4.8 m | Buy now | |
| 5 | Silver holographic Metallic finish | 94 | 4.8 m | Buy now | |
| 6 | Chartreuse Fluorescent finish | 94 | 4.7 m | Buy now | |
| 7 | Sexy shad | 92 | 4.9 m | Buy now | |
| 8 | Chrome Metallic finish | 91 | 4.7 m | Buy now | |
| 9 | Pink / white Fluorescent finish | 89 | 5.0 m | Buy now | |
| 10 | Clown | 89 | 5.0 m | Buy now | |
| Stands out least | |||||
| Purple | 40 | 2.8 m | |||
| Purple / black | 25 | 2.3 m | |||
| Junebug | 24 | 1.7 m | |||
| Black | 23 | 1.6 m | |||
Contrast quoted at 1.0 m viewing distance. · Light that survives best here: 580 nm
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Get these colours
The three that came out on top, searched on your own Amazon. The ranking above is worked out from the water and the fish, before any of these links exist.
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Gear this page implies
- A lure kit with a spread of colours See on Amazon
The point of knowing which colour wins is having it in the box.
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What this water lets through
A healthy reservoir on a settled week. A white plate disappears around 4.5 m.
Water types
Target species
Questions people actually ask
Can a Barbel see colour?
Yes. It has 3 cone types, peaking at 450 nm, 530 nm, 615 nm. That gives it 2 colour dimensions, against a human’s 2.
Where does this data come from?
No measurement exists for this species. The cone peaks are a family-level substitution — reliable for which end of the spectrum, not for fine ranking.
Sources
- Cyprinid pattern — Downing, J.E.G. et al. (1986). J. Comp. Physiol. A 159, 859–868.