I have access to collecting some but wasn't sure if they were a good addition to a cleaning crew. We have a few spots here in town where there is a lot of leaf litter and when I was poking around there I saw a good amount of silverfish. only downside is that they are very quick and not the easiest to scoop up. But if you or anyone is interested I could go see how many I could find later on this week. I am unsure what species.