As a rule of thumb, Yucatan bonefish prefer smaller (size #6 – #8) sized flies, however it is a good idea to have a few #4 flies in your box. There is no need to have several dozen different patterns, rather a decent quantity of the 8-10 top producers. Having a decent selection of flies will ensure you are able to match the appropriate pattern for differing bottom structure and water depth.
The flats of Ascension Bay are a mixture of hard and soft bottom. Some flats are covered in turtle grass or coral rubble, while many are simply white sandy or mud. Make sure that you have flies tied with both bead chain and lead eyes to fish the varying depths more effectively. Some completely un-weighted flies should be in your box as well. For a week of fishing, the typical Palometa Club fly box should contain about 2-3 dozen bonefish flies. The majority should be size #6 and #8 with #4s rounding out the difference. The standard staple bonefish patterns work well on Ascension Bay including Gotchas, Charlies, Sillilegs, smaller raghead patterns, puffs, bitters, and other basic shrimp and small crab imitations. Leaders and tippet for bonefish are typically 8-10 pound test and 9-10′ length. Monofilament is normally fine for bones while fluorocarbon is generally stronger and more abrasion resistant.