We consider that the control of photoperiod and pH exercised during
part 2 of the experiment was beneficial to the prawns and, secondly, that
the overall performance of the prawns (in terms of the number of larvae
and broods produced per unit time) was improved. The first postulate is
supported by the observed increase in mean brood size which occurred
after 220 days and was maintained throughout part 2. Similarly, the
number of times females spawned and lost their eggs, frequently after
carrying them until eyespots had developed, was less in part 2 than in part
1