To take Scott’s point further, based on my personal experience SMB don’t require any special structure/substrate for successful spawning/recruitment. I have three ponds devoid of structure of any kind and have pulled successive spawns the past 3 seasons and now face a SMB population management issue. I strongly suspect appropriate rock substrate would improve egg hatching numbers significantly, however it’s not necessary.

Many men go fishing all of their lives without knowing that it is not fish they are after. ~ Henry David Thoreau

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