Hey there folks. It has been almost forever since I last checked in. Since I put in my first pond, I put in a second one next to it that is about 5 to 6 ft deep and really just a large Koi and Baitfish pond (all natural) What I am finding is that a Mink gets in every so often and eats my sons Koi and Goldfish because it is too small for them to escape far. He does not want me to open a passage between the ponds because he does not want the Bass or Large perch (16 inch perch and 25 inch bass) to get into his pond. He already has some sunfish that made their way to his pond in a spill over.

My question is to all the big brains on here, Is there something like a tube of a certain size or a one way door that would allow the fish to escape should a mink or Heron try to attach but not let the bigger fish into the smaller pond? I tried catching the Mink and we keep the herons off generally but it is a losing battle.

Thanks in advance

- Eric

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1/10 - 1/4 acre pond plus 16 ft deep/ Plus 40 ft by 20 ft by 6 ft deep koi and fathead minnow pond next to it. Upstate NY