3.1.1.6. Water dependence (WD). For both assessed systems, the WD is exclusively associated with fish rearing in both growing and pre-growing phases. The total flow-through water circulating in tanks to produce 1 tonne of fish is 190 000 and 396 000 m3, for TR and CR systems, respectively. Thus, the cascade mode requires two times more water than the traditional one to produce the same quantity of biomass (Fig. 9).