This experiment relied heavily on the goldfish, Carassius auratus. The materials needed were a tank, a jar, beaker, tweezers, sponge, fish net, spring water, calculator, a two liter bottle of ice, and oxygen probes. There was another group working, under the same conditions, while using the same tank with a different goldfish. It is important to note, that the only difference between these goldfish were their weight. Since these fishes were already pre-weighted, there was no need to weigh a beaker with water and then subtract the difference if the fish was put in the same beaker and weighed: fish and beaker of water subtracted by the beaker of water. For each fish, members of the group had to prepare a ‘living space’ for the fish. The spring