Represents when the experiment began and ended ( 0 - initial, 1- final). While all aquariums started at the same time, not all ended at the same time. The reason for multiple time points (i.e., 0,0,1,1,1,1) is to accommodate the multiple samples taken during that time point. For example, Timepoint 1, Hour 5, only applies to OA1 and OA2. However, Timepoint 1, Hour 69.50 applies to the remaining aquariums ( OA3, CA1, CA2, CA3). Under the "Timepoint" column is "Oyster Harvests*", which marks the second phase of this Oyster Aquarium experiment. The data collected for that section would be Del15N digestive/ meat. "Oyster Harvest" is under that column since the oysters were harvested at time points indicated by the Time_Days / Hours column.