What flies do I need? This is one of the most common questions asked by traveling fly fishers. This is because many fly fishers also enjoy tying flies and wish to properly prepare for their trip. The best way to determine your imitation list is with a little research. Call a local shop in the area you are going to be fishing, ask about the hatches and the pattern recommendations for the time period that you will be fishing the area. If you are unsure of some of the patterns, have the shop send you one each of the patterns, so you may use them as samples.