Mind if I ask why ur using pacu? unless u somewhere tropical, pacu aren't going to survive the winter...unless you plan to use a heater in which case the heating bill for a tank big enough to house 250 pacu is gonna cost you an arm and maybe 2 legs.
Are you sure you want aquaponics with pacu? You're gonna need a very large heated POND and I can't even imagine the filtration what kind of filtration 250 growout pacu will require much less 250 adults.
If you really have a large enough system and are ready for the growth rate, appetite, bioload, etc then any local petshop should be able to get you the pacu you want. They'll think you're crazy though...most people can't house 1 pacu let alone 250.
I've owned 1 and I couldn't keep up with his appetite. He grew from 2 inches to 18 inches in 6 months before I had to give him away. Now 250...I wish you the best of luck. There are a handful of members here who have experience with a large stock like the one you're trying...I suggest talking with some of them before starting your journey. It will save you time, money, and headaches.
