5 gallon bucket with that mickey mouse aerator will only hold 2 herring ,to transport 12 herring you need at least a 20 gallon well and a 3 to 4 inch air stone which requires a HD 12V air pump.The water should never exceed 60 or they will die. The bass pro aerator will also kill them as the heat generated by the submersible motor will raise water temp to an unacceptable level and kill them. Scales also clog submersible pumps and over heat, clog or jam them.