The trial was conducted at Lerang Research Station (Jørpeland,
Norway) during the period 14 July to 3 December 1993. The
experimental fish were sampled from two size groups of sexuallyimmature Atlantic salmon originating from the same population
of post-smolts (S1) graded 9 months prior to the trial. The first
group included 2400 salmon with average initial weight of
1.06 kg (group I), and the second group included 1200 salmon
with an average initial weight of 2.48 kg (group II).