Dale,
You can really turn a phrase - great imagery. Blueberry fish volleyball.
You never know what kinds of foods they will take a shine to. Some of my fish like oranges, some don't touch them. Only one will eat squished-out peas (Kohaku) and boy, does he love them! I quit feeding him peas a while back because I started thinking his face had kinda lime greenish tint. I dunno.
A few weeks ago I found a cicada larvae on the ground beneath a chair while I was picking up pears. (Every day, pick up the pears....

) It hadn't broken out of the shell just yet & I set it on the chair arm so I wouldn't step on it. Then I bumped the chair and it bounced into the water. Sanke slurped it and chewed and chewed and chewed. (It was one of the bigger 1 1/2" long kind) I kept waiting for her to spit it out, but she ate that big ol' yucky, crunchy thing.
All of the koi really like nightcrawlers as well. I go outside at night after a good rain with a flashlight and yank them out of their holes with a big pair of glass-making tweezers. Yet another backyard activity at our household that frightens the neighbors......