The present study investigates vertical distribution of fish size in three 12 m × 12 m
wide and 14 m deep sea cages stocked with Atlantic salmon of average weight from 3.5 to
3.7 kg, at commercial densities between 15.6 to 16.2 kg m-3, in Norway. For
each cage, individual fish weight were estimated by three 0.6 m × 0.6 m measuring frames
as fish swam through. The frames were positioned at 3, 6 and 9 m depth. Recordings were
carried out over five days per cage in succession, and during relatively stable
environmental conditions in late autumn 2010. In all cages, measured fish were 15−25%
smaller at 3 m compared to the average weights at 6 and 9 m depth. Largest average weight
difference between depths within one cage was 0.995 kg. The average weight at 6 and 9 m
was higher at night-time compared to daytime. Fish at the lower end of the weight spectrum
were predominantly registered at 3 m, while fish at the higher end of the spectrum were
mostly registered at the greater depths. Fish of average size were well represented at all
three depths. The fact that smaller fish swam shallower may be ascribed to natural
behavioural traits and introduce an important consideration in representative sampling
within commercial sea cages. In biomass estimations and sea lice counts size-dependent
vertical stratification needs to be accounted for.