I almost exclusively bank fish and when I catch my bait (bluegills) I put them into flow troll bucket and tie it off to something until I'm ready to catfish. Now I have 2 questions. My first question is: When I transport any that are left over do I need an aerator or is their enough oxygen in the water to keep them alive until I get home and put them in my bait tank ? My second question is: What exactly does an aerator do ? Does it put oxygen in the water ? What is the purpose of an aerator ? All answers and input are appreciated. Thanks.