The Adams is one of the most recognizable and productive dry flies out there, and it must have a spot in your box. Adams Flies are a great choice anytime mayflies are hatching as well as when mosquitoes, caddis, and duns are coming off the water. Adams have proven to produce in most situations fast, slow, or still water, so grab a dozen or maybe 2 because youre going want to throw them everywhere you fish. Per 12. Hook sizes: #20, #18, #16, #14. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Flies.