Effects of White Spot Disease on the Overlapping of Moving Track Image of Trachinotus ovatus
[Objective]The effects of white spot disease(WSD)occurrence on the overlapping of moving track image of Trachinotus ovatus under different density conditions were investigated,which provided reference for resource protection and aquaculture technology of T.ovatus in the deep sea intelligent cage.[Method]Using comparative analysis method,the healthy T.ovatus and the fish infected with WSD were used as study objects to investigate the changes of moving track and track image overlapping between two study objects.[Result]The healthy fish stayed in a circle swimming state,and the moving track was curve,and the circle swimming state was obvious as the density increased.The circle swimming state of T.ovatus infected with WSD was less than healthy T.ovatus,and diseased T.ovatus liked to stay at the corner of the observation tank for long time.The overlapping of moving track images of healthy T.ovatus was relatively uniform at different times and increased with the density increasing.The overlapping degree of moving track images of the WSD fish was unstable,and appeared significant differences in the same group.The healthy fish preferred to swim back and forth in the central and peripheral areas at most time,with a relatively high frequency of movement and stayed in the central area for a short time.Furthermore,the frequency of back and forth increased with the density increasing.However,the T.ovatus infected with WSD stayed in the central area for a shorter period and had a lower frequency of entering and exiting the central area.With the time going on,the time of T.ovatus stayed in the central area prolonged,and the frequency that T.ovatus entered and exited in the central area decreased.[Conclusion]After infected with WSD,T.ovatus has weaker vigor,suggesting that WSD has impacts on its moving tracks,track image overlapping,and retention time in the central area.
Trachinotus ovatuswhite spot diseasemoving trackoverlapping degree of imagecage culture
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NSTL
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