Stage 0 · Fish Vision Camera
Your lure is not the colour you think it is.
Water deletes light one wavelength at a time, and the fish looking at your lure does not have your eyes. This renders both effects: the physics of the water column, then the cone set of the animal you are trying to fool.
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Detection contrast
Pick a lure to begin.
Dichromat views are false-colour. A two-cone eye has no third axis, so its two channels are spread across your three — what you are seeing is which colours the fish can still tell apart, not a photograph of its subjective experience, which nobody can render.The full model, and where it is wrong.