Yes, by the pound. As for an amount, I'd make sure you have ample habitat for them. Large rocky areas (like riprap) for them to hide in or they won't survive long.

IIRC the client stocked 5#/ac without enough habitat and very few have been observed. One pond that didn't have any fish predators, when drawn down, didn't show any signs of the papershells. I'm thinking turtles got them due to no habitat to hide in.

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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).