Submerging plastic barrels or even 5-gallon buckets stuck together forming a tub open on one end can serve as easy to manage spawning sites. I make so the provided cavities are 18 to 24 inches deep. A well placed hollow log with inside diameter of 12" or a little more will also be well received by males.

Culverts would work well.


I would space nesting sites at least 20 feet apart to reduce discord between breeding males.

Just a couple spawns per year will get you where you want to be.