Decollates lay an average of 2000 eggs during their 2-year life span. If you start with a smaller amount of Decollates, it may take a few years for the Decollate population to grow to the optimal level. To speed up control, handpicking the larger pest snails is recommended because Decollates prefer to feed on smaller brown snails and brown snail eggs. As Decollate increase in number, so does their effectivenes