Selecting the appropriate flasher depends heavily on water clarity and depth. For deep-water trolling, choose flashers with high-intensity UV or glow-in-the-dark finishes to ensure visibility where sunlight is limited. In clear, shallow water, opt for highly reflective metallic finishes (chrome or gold) or holographic tapes that mimic the natural flash of baitfish. The size of the flasher (typically 8 to 11 inches) should match the target species; larger flashers provide more vibration and aggressive movement for Chinook salmon, while smaller blades are better for Coho or Kokanee.