Abstract: An aeration device which can be adapted without permanent connection to an existing container such as an ice chest is disclosed. The apparatus provides a baffle which substantially conforms to the cross section of the container thus dividing it into first and second sections. One side of the baffle is provided with a pump which transmits fluid from the second section in the container through the baffle to the first section where it enters an aeration sparge thereby creating a plurality of high speed water jets which strike the water surface of the first section and aerate the same. The second section of the container houses a pump which is separated from the fish, thereby preventing the intake of fish and into the pump and halting its proper function. A flow opening can be provided in the baffle to enhance the flow of fluid from one side of the baffle to the other.