Consequently, the number of fish stocked or in other words the stocking density depends on the combination of oxygen supply and its consumption. During the production cycle, the oxygen consumption ofthe batch will always be lower than the supply except at one day, Dli mit,
where oxygen consumption equals oxygen supply (Fig. 3). When the oxygen supply is low (in summer), a batch of smaller fish with a lower consumption of oxygen per fish, can contain more fish than abatch with bigger fish having higher oxygen requirements per fish.Therefore, the number of fish stocked depends on the date when the batch was stocked