I'd say it's too late for the best bang for your buck with Tilapia. The Blues will die at 45°F, but they'll get really sluggish at 50-55. They will still grow and pull off at least one spawn before then, but roughly 1/2 the growing season is over.

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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).