They can survive much longer than 2 or three days, but so could you.
My tilapia made it a week without food, but the water temperature was hovering just over 60F , so they weren't eating much even when they were fed.
For some reason I am unable to get a search of the forums to turn up anything.
Bob, can you lead me to more info about your radial filter?
I'd suggest Rob bob on you-tube. He has a good video on a radial flow filter and a solids vacuum. Just search Rob Bob
Had to recycle a system once with thirty 1/2 -3/4 lb fish. They went the full 3 weeks(no feeding) without any noticable ill effects.
Amy Lu said:
How long fish can survive without feeding?