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(Synopsis) Trout see a world invisible to man - the world of ultraviolet light. You can now meet them in that world. Through abundant photographs and clear text the author illuminates the remarkable distinctions between the vision of man and the broader vision of trout, revealing for the first time flies, fly tying materials, and insects in both visible light and reflected ultraviolet light. In this groundbreaking work, the author presents new scientific discoveries in the understanding of trout vision and illustrates how these discoveries benefit the discerning scientific angler.