Figure 2

Mean number of abnormal behaviors (roll, backward swimming, biting tag area, exploring tag area with the tail and ‘panic’) observed per fish during a 10-min observation period 0 h, 3 h, 12 h, 36 h and 57 h after tagging. The fish were tagged with four different methods; the Økland method, Jellyman and Tsukamoto method, Westerberg method and Økland-Westerberg anchor implant method (n = 6 fish in each group).