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Before the work of Gary LaFontaine who recently died from Lou Gehrig's disease, the underwater lives of caddis flies and their effects on trout feeding behavior was largely misunderstood. Gary spent a lot of time underwater with scuba gear studying the aquatic habits of these secretive insects. He observed how trout responded to caddis larvae and pupae differently. He also observed diving, egg laying adult female caddis at very close range. Gary took the time to see these insects from the same prospective as trout see them. He did this work while studying for a biology degree. His thesis became the most definitive work on caddis flies ever produced. Gary's work disclosed several facts hither to unknown about caddis flies. Probably the most revolutionary find is that when many species of caddis pupae rise to the surface their abdominal areas are surrounded by an air sack. He watched from underwater as trout keyed on these air bubbles as they fed. The LaFontaine Sparkle Pupa series was developed from this research. Over a ten year period Gary's research was turned into a book that fly fishers could understand. It was called Caddisflies. Caddisflies is required reading for anyone who desires to be a complete trout angler. Unfortunately it is out of print, so look for a used copy.