What JHAP said (Where is he getting the good posts from lately?
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I'd be careful not to stock too many fish at first, you might overload the pond and they might all die again this Summer. That pond can only hold about 175# of fish, so keep an eye on how many fish you put in since you don't know how many are in there now. I'd put in about 50# of LMB and wait 'till September and see how many GSF they consumed - the LMB should be fat and happy!