Technical Abstract: A small single-axle trailer was designed and built to hold three 50-gallon liquid oxygen dewars. The unit is small enough to be moved around a commercial channel catfish Ictalurus punctatus farm with a pickup truck or small tractor. It is being used successfully to provide supplemental oxygen at remote on-farm locations to channel catfish that are being held in a net sock at high density prior to sale. The total cost of the complete sock-saver with trailer, dewars, pressure/flow regulators and diffusers was $8400. It is simple to operate, durable and virtually maintenance-free. Since it does not require any electrical or mechanical power source, it can be set up anywhere. The small "footprint" of the trailer does not interfere with the other equipment normally used when loading fish from a sock. Individual flow regulators allow use of one, several or all eight diffusers as needed. The diffusers and hoses are self-weighted, tangle-free, and do not interfere with the normal process of crowding the fish in the sock and dipping them up in the loading basket. The unit can increase dissolved oxygen in a sock by as much as 0.9 mg/L.