Coyote, I think we have spoiled our goldies rotten to the point where they actually have strong likes and dislikes.

If they were starving, I'm sure they would eat just about anything not anchored down!
Case in point. When I first gave them freeze dried tubifex worms, they actually spit it out like it was poop!!

I then gave them freeze dried brine shrimp in lieu and they sucked it up like like a vacuum cleaner.
A few hours later, they were eating the tubifex worms! What spoiled rotten goldies!
Most people know this happens with dry pets like cats and dogs. My mother's cat was so spoiled from being fed sashimi and raw filet mignons(I'm not kidding) that he would not even give dried cat food the time of day.
Our wet pets are no different. They are very smart!