A batch represents all the fish of the same cohort stocked in the same
cage. A batch is first stocked at 10 g in a cage of 600 m3 (period 1), then
the fish are transferred to a cage of 1800 m3 (period 2). The transfer
takes place when the rearing density reached 10 kg/m3 in the 600 m3
cage. The number of 10 g fish stocked per batch was constrained by
the daily oxygen supply in cages during the whole rearing period.
Daily oxygen supply (O2_supply_cagen) depends on: 1) The concentra-
tion of dissolved oxygen in the cage which was constrained to a mini-
mum 3.5 mg/L. 2) The water flow going through the cage and carrying
the oxygen. 3) The concentration of dissolved oxygen in water entering
the cage