On my Stardew Valley farm, I have a fish pond containing five ice pips. They've just requested a crystal fruit, which I gave them immediately. After doing so, I checked out the pond to see the new capacity, and noticed that it says the fish a are swimming in circles.
It's been a while since I looked at the pond, so I don't know if this status is new or not.
Is it bad news? Is it just because they had a request today? Or maybe even just because it's raining? (It's Saturday 13th Summer.) I also have lobster pond and a sturgeon pond (both at maximum), and they've always been happy.