 Suckers use their cartilaginous jaws to scrape the algae and detritus off the stones at the bottom, and despite any shortages of these foods, suckers show little seasonal movement.Diatoms, detritus, algae, and other organic debris have been found in the gut.They are unique in that they are the only members of the genus to hybridize with other members of the same genus, increasing gene flow among species.