So they settled for sucking on fingers instead.
They're not going to starve; they live 9 months out of the year without any feeding from us at all. But they sure do enjoy their fish kibble.
We've had these fish a long time; most of them are 10-20 years old. I remember going to the pet store with my dad to pick 'em out. Most of them had names and were insanely tame; they'd come to the surface whenever you rang a bell. You can pet them on the head.
Food is a good motivator. They caught onto the bell trick really quickly: "hear that fellas? She's ringing the bell! Food is at the surface!!"
Food was also a good motivator for the beast (raccoon? eagle? heron?) that wiped out just about our entire family of fish a few years ago. Now we only have three left.
I'm still mourning the loss of Blue Boy and Gorbachev.