pacu and why feeder fish? wild pacu RARELY eat insects let alone fish, they're mainly vegetarian. My first fish was a wild caught pacu my mom brought from a trip many years ago and it ended up dieing cause I didn't know it was vegetarian, lasted about 8 months on just a few aquarium plants, never touched pellet live frozen or flake. I feel so bad but I learned my lesson. Can't wait to have a tank capable of keeping a pacu comfortable. goodluck with yours =] very fun fish