Clickable -> Fish and the Rubies

Hey Guys. Iam totally new to this game so i bare with me pleas.

So these "Fishes" who spawn random who give a huge amount of gold and sometimes rubies are a great thing. But today i noticed that i do not get Rubies from them anymore.

Soooo my Question is: Why not? Is there a set amount of rubies per run? or something else?

Thx for the Help :)