I don't know if the LMB would cross with the SMB. The other problem is getting same sex LMB. I don't know of any hatchery that sells them, and the fishing season in MI. might not allow you to harvest any LMB while they are spawning.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).