I dont know about the Berkley Nymphs but I absolutely swear by the Mister Twister Exude Nymph, 1.25 inches long. I only use the Moss Green/Pearl color and catch big gills and nice slab size crappie with it. If you flyfish like I do, slide a tiny bead head on your line first, then a small thin wire hook and hook the Nymph through the head and its ready to go. They run about $2.50 for a package of 20 and can be ordered from their website. I dont know what the fish think it is but its the most successful bait I have come across in a long time.