Color and Visual Cues: Do Green Tench Prefer Green Baits?

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Excerpt:
Introduction
Fishing for tench (a greenish freshwater fish) raises the question: does a green fish really want a green bait? To answer this, we look at how fish see color and how light behaves in water. Fish have eyes with special cells (cones and rods) that let them see colors and brightness. Many fish can see into ultraviolet (UV) or blue ranges that humans can’t (www.sciencedirect.com) (pmc.ncbi.nlm.nih.gov). In clear summer sunlight (like in June), the full spectrum of light (from UV through red) is available, but water changes that. Underwater, red light is absorbed very quickly – over 100 times faster than blue (water.lsbu.ac.uk). This means a bright red float or bait may appear gray or black to a fish just a few feet down. Instead, green and blue light travel farther, so fish often see blues and greens best in deeper or stained water (water.lsbu.ac.uk) (www.fishing-v.ru). In fact, when light gets dim (like at dusk or in heavy algae), fish eyes shift to see more blue-green and less red-orange (www.fishing-v.ru).
Tench live in ponds and lakes that often have green algae or brown tannins, so their world can look very green-brown. To figure out good bait colors, we combine fish vision research with how water and clarity affect visibility. We also suggest simple experiments: for example, put out two identical baits or feeders (only color differs) and count which draws more bites. That way we learn if tench really prefer green or respond to other cues.
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