Just an FYI, my one of two bluegill in my pond has nipped me twice, and my son once. Plenty to eat, no competition lots of space. It doesn't bother us too much, it is just a surprise as the gill is large enough to make the nip substantial.

That is good to know about swimming ponds, it is something to consider as part of routine expenses and maintenance. I didn't realize that would be normal practice.