Tham khảo tài liệu 'autonomous underwater vehicles part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Deep-Sea Fish Behavioral Responses to Underwater Vehicles Differences Among Vehicles Habitats and Species 229 3. Results The behavioral data of 501 fishes from the four selected species species groups were analyzed. Apart from a single exception codling in dive transect OB22-1 disturbance responses occurred during all transects and in all species species groups. On average 44 of all fishes showed disturbance and in 7 of the 15 total observational sets species-transect combinations that were analyzed more than 50 of the fish displayed disturbance responses. While pre-arrival disturbance was relatively rare 14 of all disturbed behavior registered disturbance responses at far distance occurred most frequently 59 . The disturbance responses were only rarely directed towards any of the four UV s used. No clear signs of attraction or aggressive responses triggered by the UV s could be observed in any of the four species species groups. Differences between underwater vehicles The codling showed a significant difference p in disturbance responses between two dive transects performed in the same area at the Mériadzek terrace Bay of Biscay one with the manned submersible Nautile transect OB22-1 Table 1 and the other with the ROV Victor 6000 transect VT-1 Table 1 . While no disturbance response was registered during the dive with Nautile 35 of the individuals encountered during the ROV transect showed clear signs of disturbance. Among the disturbed fish 23 showed pre-arrival disturbance while 54 responded at far distance and 23 responded at short distance to the approaching vehicle. Regarding undisturbed natural behavior no significant differences in both vertical positioning and locomotion behavior were found between the two transects. Codling Fig. 2. Disturbance responses of codling during a manned submersible transect left and a ROV transect right in the area of Mériadzek Terrace Bay of Biscay Differences between dive transects and habitats Fig. 3 Orange roughy
