How long can Koi fish survive without a pump?

These will hold 50 gallons of water and be about 5 to 6 inches deep. They will keep the large fish alive for many days without air pump or mechanical pump as long as the temperature is right. But you might have to cover the pool with a screen or net to prevent the fish from jumping out. read more

Our koi go the entire winter without the pump/filtration unit. Winter wise in a pond, all you need is a bubbler and a surface floating heater. So it’s a matter of months. read more

Air pumps force oxygen into your tank by increasing surface agitation so your fish have lots of O2 to breathe in. In many cases, your aquarium inhabitants don't need the extra oxygen and live just fine without an air pump. read more