Fish near the aerator. They are there because the lake is susceptible to winter kill because of low oxygen, but those aerators won’t oxygenate the whole lake. The further from aerator the lower the oxygen.
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Aeration usually works fine in the fall, winter and spring if you DO NOT overcrowd your livewell. One fish or 1 bait exceeding the stocking density in the summer is when suffocation, death and dying begins.
Marine Metal Fish Saver Portable Aerator | Bass Pro Shops
Fish, like all animals, must obtain oxygen from the environment for respiration. Oxygen is far less available to aquatic organisms than it is to air-breathers, and the dissolved oxygen content of water may limit the activities of fish.
In most natural waters, the supply of oxygen to water (diffusion from the atmosphere and production from underwater photosynthesis) exceeds the amount used in oxygen-consuming processes, and fish seldom have problems obtaining enough oxygen to meet normal metabolic demands. In aquaculture ponds, however, the biomass of plants, animals and microbes is much greater than in natural waters, so oxygen is sometimes consumed faster than it is replenished.
Depending on how low the dissolved oxygen concentration is and how long it remains low, fish may consume less feed, grow more slowly, convert feed less efficiently, be more susceptible to infectious diseases, or suffocate and die. Aquaculturists avoid these problems by aerating ponds mechanically to supplement normal oxygen supplies.
MARINE METALS Fish Saver Aerator Pump | West Marine