normal limpets you find on the rocks and groyns at low tide can be used as a stand by bait, or as a tipping bait, but ive not had much luck as a hookbait in their own right. not a lot of smell and rather rubbery. slipper limpets are much much better, especially after a storm, when they are dislodged and wash up dead and dying, on the tide. if you wanna use limpets, thats your best choice.