Isn't there a white sturgeon run in the Columbia River? IIRC, they get considerably larger than 500#.

Dave, I was going to ask about how old they can get, but the last line answered it.

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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).