Fish, Habitat, How To, Nature, Oregon, Photography, trout aeration of water…. Date: August 9, 2015Author: SwittersB & Exploring 0 Comments This lovely spillway aerates the spilling water from one pond to another providing oxygen to the cruising fish in the holding ponds. Below, another spillway adds additional aeration to an adjacent holding pond for the large brood, rainbow trout. Please Share:PinterestLike this:Like Loading...