It is curious the difference when baitfish are living in the pond or aquarium with a pet bass & when they are introduced.
On a previous thread, I talked about the pet bass I have in my koi pond. The only fish in there are the bass (now about 15" long), six koi (most larger than the bass) and a hefty bluegill that is too large to fit inside the bass's mouth (for now at least). The mainstay of the bass's diet is nightcrawlers, but about every other week, he gets 10 large feeder goldfish. I add them to the pond at the waterfall and it is game on. The bass is a blur of motion, picking off each goldfish as quickly as he can, even coming out of the water when he is pinning them against a shallow rock. He typically eats all 10 in less than a minute. Rare is the goldfish that finds a safe haven, the longest I have seen one play hide-&-seek is about 5 minutes. Eventually, the goldfish wanders out from his hiding spot & wham, the bass comes flying in to hammer him. I can't keep any baitfish living in the pond because the bass eats them right away
Unlike other peoples experience, my bass has never turned down food. Even with a belly full of goldfish, he will nudge the koi out of the way to slurp down some of their pellets. No matter the time of day, weather conditions, or solunar predictions, this bass will eat if there is food present. I thought I may be underfeeding him, but he has quite the beer belly going on. He continues to eat even with goldfish or nightcrawlers hanging out of his mouth & gills. I really should get his gene pool back into my home lake.
One other note about the bluegill's behavior around the bass. Although the bluegill is too big for the bass to eat (he is about 9" long), he is wary of the bass. He usually positions himself on whatever is the opposite end of where the bass sets up. If the bass is cruising around, the bluegill will back up into the rocks as he nears. Maybe the sight of the bass taking out the goldfish has given the bluegill PTSD, but he is one cautious dude, not the happy go lucky bream that we usually see out sunning themselves all the time. If the bass continues to grow & gets into the 5lb class, I do expect to see the bluegill or smaller koi's tail sticking out of his mouth one day.