Sticky eggs are laid underneath of hard surfaces like rocks and logs. The male guards the nest, fanning it, defending it, and removing fungused eggs. Again, this is just like the fathead minnow. The female can lay 40 to 400 eggs at a time. The eggs hatch in about eight to twelve days.
Females begin breeding at about a year of age while males peak at two years of age.
Most likely, bluntnose minnows and fathead minnows are similar enough that one can use the many pages of information on fathead minnows for bluntnose minnows with minor changes. See my fathead minnow page for more information. They were small, maybe an inch in size. Except for the underslung mouth and generally a more slender body, they looked like young fathead minnows. They must be sensitive fish.