Fish gone

I have a small pond and two goldfish in it. They have disappeared overnight.
I have also noticed a hole in the soil about 8 - 10 inches to the side of the pond. We suspected a rat so we set up the trail camera and there it was. Setting a trap tonight. But, I'm wondering, would a rat take the fish? I know they swim very well.
Also, we saw a Heron in the field just behind yesterday. Also possible culprit.
Never seen one in the garden or even on the fence though.
I have also noticed a hole in the soil about 8 - 10 inches to the side of the pond. We suspected a rat so we set up the trail camera and there it was. Setting a trap tonight. But, I'm wondering, would a rat take the fish? I know they swim very well.
Also, we saw a Heron in the field just behind yesterday. Also possible culprit.
Never seen one in the garden or even on the fence though.
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I'm not sure how well, or for how long, a rat would swim underwater, and he'd have to do that to get the fish I think?