My pacu are gentle, jovial giants, who are very interested in the world outside their tank. It seems that if they could, they would join us outside of their tank. Their behavior is very dog-like, pushing each other out the way to be petted, chasing each other and jostling for food. Sometimes my husband will pick up our very jealous cat and rock her saying "Pacu Kitten goes swim swim swim. Pacu Kitten goes swim swim swim", as he walks in front of the tank. The pacu follow along, back and forth, back and forth.... the four of them forming a parade inside and outside of the tank.
After eating, Leonardo gets rambunctious and pretends he is a herding dog. He used to "herd" all the other fish into one corner of the tank. Now, he only has Adonis to "herd" into a corner. My pacu are extremely interactive fish with great big personalities. Here's an old feeding video where the rascal Leonardo tries to get his brothers potato "chip" while ignoring his own. He is my big rascal.
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Here's another old video where they tag team a carrot
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As always, Leonardo de Fishio gets the last bite
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