If you're dead set on wire in the cage, I'd do like was suggested, plastic inside, and regular galvanized wire outside. You could use 1 1/2" chickenwire outside to keep otters out. I think the total cost of both types of netting would be less than stainless or coated wire netting.

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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).