Effects of flow velocity on the growth,personality,and anxiety behavior of the juvenile Sebastes schlegelii
To analyze the effects of different water flow velocities on the growth performance and behavior of fish,juvenile Sebastes schlegelii was selected as the research object.Growth performance indexes,such as specific growth rate and weight gain rate,personality characteristics such as bravery,exploration and activity,and anxiety were observed at 3 flow rates of 0(control group),1 and 2 BL/s,and the correlation among these indexes was analyzed.The results of growth performance showed that there were no significant differences in final body length,final body mass,specific growth rate and weight gain rate among all groups(P>0.05).In terms of personality characteristics,there were no significant differences in bravery and activity among the three groups(P>0.05).Among the exploratory indicators,the number of times surrounding strange objects in 2 BL/s group was significantly higher than that in 1 BL/s group and control group(P<0.05).There was no significant difference in the mean distance between the three groups(P>0.05).Among the anxiety indicators,the number of fish entering the bright area did not reach the significant level among the three groups(P>0.05).The total time of fish in the bright area in 1 BL/s group was significantly higher than that in 2 BL/s group(P<0.05),while the total time of fish in the control group was not significantly different from that in the other two groups(P>0.05).Correlation analysis showed that there was a positive correlation between exploration and activity of fish in control group(P<0.05).In the 1 BL/s group,exploration was negatively correlated with anxiety(P<0.05);in the 2 BL/s group,boldness was positively correlated with both exploratory and active activity(P<0.05),and exploratory and active activity were also positively correlated(P<0.05).In summary,water flow speed has no significant effect on growth performance,bravery and activity,but has some effect on exploratory and anxious behavior.Their personality traits were positively correlated;high flow rates(2 BL/s)may increase exploratory behavior,but at the same time increase anxiety.The results of this study are helpful to understand the behavioral response characteristics of fish to water flow speed,and provide references for improving the welfare of farmed fish.
water flow velocitySebastes schlegeliigrowth performancepersonalityanxiety
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