All fish used in the experiment were sampled from the same population and starved for 9-11 days prior to transport. After transport approximately 80 tons of fish were pumped into two cages and allowed to rest for 24 h before the first sampling. The experiment (Table 1) started by crowding the fish as the industry started to pump and slaughter the fish according to its practice. All fish were sampled within the hour and leftovers of crowded (nb 100) fish were released back into its cage mixing in with the rest of the population of rested fish (nb 10.000). On day 2 (Table 1), sampling was done as described above.