Well I read part of a book on this but can not remamer the name. Nightcrawler scent triggers the most feeding habits. Crawfish is second and after that is salt garlic and a few others. garlic was only at about 3% and salt was close to it where as nightcrawler at top was at about 80%. Then why do so many companies push salt and garlic so hard? Well, I recently bought a nightcrawler crawfish, and garlic scent to test which is best. All 3 are the Gulp! Alive spray so brand will not be a factor.