Flood water: what light survives

Flood water: the light that survives here peaks at 690 nm, Secchi depth about 15 cm. Which lure colour stands out, computed rather than charted.

Light that survives best here: 690 nm

Secchi ≈ 15 cm

What this water lets through

1 m 3 m 10 m 400450500550600650700
K_d is the diffuse attenuation of the light coming down; c is the beam attenuation along the line of sight. Confusing the two is the classic error in this field.
λ Kd c 1 m 5 m
400 nm 36.032 91.372 0.0% 0.00%
430 nm 25.244 78.116 0.0% 0.00%
460 nm 17.995 68.434 0.0% 0.00%
490 nm 12.990 61.127 0.0% 0.00%
520 nm 9.569 55.546 0.0% 0.00%
550 nm 7.225 51.185 0.1% 0.00%
580 nm 5.614 47.691 0.4% 0.00%
610 nm 4.733 44.956 0.9% 0.00%
640 nm 3.993 42.533 1.8% 0.00%
670 nm 3.628 40.520 2.7% 0.00%
700 nm 3.346 38.712 3.5% 0.00%

K_d is the diffuse attenuation of the light coming down; c is the beam attenuation along the line of sight. Confusing the two is the classic error in this field. Method and sources

Lure table

Ranked by how much each colour stands out to a Wels catfish in these conditions.

Colour Contrast Seen from Fish view
1 White
74
11 cm Buy now
2 Chartreuse / white Fluorescent finish
71
11 cm Buy now
3 Glow Glow finish — not modelled
69
11 cm Buy now
4 Chartreuse Fluorescent finish
68
11 cm Buy now
5 Bone
66
11 cm Buy now
6 Pink / white Fluorescent finish
0
11 cm Buy now
7 Clown
0
11 cm Buy now
8 Blue / white
0
11 cm Buy now
Stands out least
Watermelon
0
3 cm
Brown
0
3 cm
Watermelon red flake
0
3 cm
Olive
0
3 cm

Contrast quoted at 10 cm viewing distance. · Light that survives best here: 690 nm

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Target species

Wels catfish Silurus glanis Channel catfish Ictalurus punctatus Sturgeon Acipenser spp.

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