Key West’s year-round tropical climate, its unique geography, its expansive reef system and the abundance of life that depends on those reefs are what make its tarpon fishery so extraordinary. The harbor’s deep water serves as a staging point for an amazing annual tarpon migration. Those fish come up into the adjacent flats to feed, offering fly-rodders an exceptional opportunity to target them. Yet, as is too often the case, such ecosystems are fragile and easily disrupted by the heavy hand of man. Corals, sea grass and other marine plant and animal life found on the seafloor depend on sunlight for photosynthesis. If the sunlight is blocked, it doesn’t take a scientist to figure out what happens. There’s a general consensus among anglers that continued disturbance of the silt has led to continued degradation of Key West’s tarpon flats.