Abstract: This invention provides a livewell for storing and/or transporting live fish, and an insert for a livewell, including a padding system that is disposed between at least one wall of the tank one or more fish. The livewell or the insert may include one or more sensors, wherein the one or more sensors provide monitoring of oxygen, temperature, pH, and/or ammonia in the water of the livewell. The livewell or the insert may further include apparatus that performs at least one function selected from circulating, oxygenating, filtering, and chilling water in the livewell, optionally in accordance with at least one corresponding sensor. The padding system may include one or more portions that divide the livewell into two or more chambers, each chamber adapted to accommodate a fish. In one embodiment, the padding system comprises at least one pouch adapted to accommodate a fish.