One of the biggest mistakes a bonefisherman can make is failing to adjust his fly to changing water depth. Your fly should be weighted such that it sinks quickly to the bottom and then stays near the bottom within view of the fish after you begin stripping. If you strip the fly above a bonefish, it will never see it.
The average flat depth, whether you’re wading or poling, ranges from 1-2½ ft. In this depth, a Gotcha or Amber Shrimp with medium sized bead chain eyes should provide close to the perfect sink rate, without overweighing the fly (and potentially spooking the fish). A good rule of thumb is your fly should reach the bottom in about 3 seconds. If you find your fly is not getting to the bottom, you should switch to a fly with lead eyes or add a few wraps of lead wire to the eye of the fly.
The angler who is willing to fish deeper flats will often be rewarded with the largest bonefish. Big bonefish prefer the protection of deeper flats or shallow flats close to deep water. When you’re fishing water 3-4 feet deep, you’ll need a fly with lead eyes to get to the bottom quickly. Proven deep-water flies are the Clouser minnow (especially tan and white and chartreuse and white), the Simram, (a rabbit fur version of the Gotcha fly with lead eyes) and Henry Cowen’s Bonefish Scampi. Lead eyes come in a variety of weights and for joy of casting, you’ll want to carry flies with the smaller lead eyes, as well as the heavier lead eyes that cause many of us to duck when forward casting.
The last thing a bonefisherman wants to do is scare the daylights out of an actively feeding fish by casting too heavy a fly too close to the fish. Therefore, you must go light in skinny water. By light we mean no weight other than the weight of the hook. For this we recommend mono (or plastic) eyes and a body that lands softly. A well-designed fly for this situation is a pattern called the bunny bone in sizes 4, 6, and 8.
The bunny bone is made with rabbit fur, rug yarn and mono eyes. You can throw this unweighted fly quite close to a tailing fish. Its entry into the water is soft, but it sinks well. The rabbit fur makes it look alive even before it’s stripped. All you need to do is give it the tiniest of strips. Don’t strip the fly too far or too fast when working a tailing fish.
Before you begin fishing it is also advisable to have a handy selection of the flies you’re most likely to use that day. Have a selection that covers all water depths, so you are prepared when a quick change is required. For even quicker adjustments to changes in water depths, have a spool of lead wire handy and wrap a small piece around the eye of the fly, as needed.
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