As I'm watching my male PK tend to his nest on day 2, I've noticed that he is still spitting up a large number of eggs into the bubble nest repeatedly. Doing a great job of picking up the eggs that repeated fall day in/day out. But I've also noticed that his belly is much bigger now (he had lost weight from no food during the days of courting prior to the actual spawn) and I can only assume he has eaten some of the eggs during all of his time tending to the nest and falling eggs.
A question that comes to mind is, he is clearly not an egg eater as there are still hundreds of eggs in the nest and he is clearly still picking up and spitting the eggs back into the nest. So I'm curious as he picks up the egg in his mouth, is he able to discriminate whether the egg is infertile (based on a taste or smell) and then proceed by swallowing the infertile eggs vs spitting back up the developing fertile eggs?