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This popular and innovative Brown Deep Sparkle Pupa pattern was developed by the late Gary LaFontaine. Hours of underwater reasearch with scuba or snorkel equipment revealed that caddis can form a gas bubble around themselves when prepering to hatch. The antron or Z-lon case around this fly forms a transluscent impression of that bubble that trout find hard to resist. Fly fishermen everywhere have made this fly one of the staples in their selections.