The Effect Of Exercise Training On The Growth Performance And Swimming Behaviour Of Procypris Rabaudi

Stocking is an effective method of restoring and increasing the population size and resources of fishery resources in the waters.Due to the limitations of artificial breeding conditions,the living environment of fish differs greatly from that of natural rivers,which makes it difficult for fish to adapt to the complex flowing water environment in the wild after release,and the stocking does not achieve the expected effect and the survival rate of fish fry is low.Therefore,it is necessary to train fish before release to enhance their swimming ability and their ability to adapt to the wild environment.However,most of the current studies on exercise training for fish stocking and release focus on changes in physiological functions and tropism,but there is little research on the training cycle and a lack of uniform understanding.In this paper,we investigate the effects of different exercise training durations on the growth and swimming behaviour of procypris rabaudi by analysing the changes in growth and morphological indicators,swimming ability and tropism of procypris rabaudi under different exercise training durations,in order to find the best exercise training programme for procypris rabaudi before stocking and release,and to provide technical support to ensure the survival rate of stocking and release.The research result in this paper is as follows:(1)Effects of different exercise training durations on the growth and morphological indices of procypris rabaudi.The specific growth rate,weight gain and fatness of the procypris rabaudi were generally lower in the training group than in the control group at different exercise training durations,but the overall differences were not significant.After 5 weeks of continuous exercise training,the training group had higher body length and lateral caudal area values than the control group,and lower dorsal fin area values and height to length ratios than the control group,resulting in a more streamlined body shape in the training group.This may be due to the adaptation strategy of the training group to reduce their water barrier area and improve energy use efficiency.(2)The effect of different exercise training durations on the swimming ability of procypris rabaudi.The absolute critical swimming speed of the training group was slightly higher than the initial value,with a maximum of 4.9% higher than the initial value,while the absolute critical swimming speed of the control group did not change significantly.The absolute critical swimming speed was higher in the training group than in the control group,and the absolute critical swimming speed increased significantly faster with body length in the training group than in the control group.The relative critical swimming speed in the training group tended to increase and then decrease,while in the control group it tended to decrease.The absolute uniformly accelerated maximum swimming speed tended to decrease and then increase in both the training and control groups,and the relative uniformly accelerated maximum swimming speed tended to decrease over the duration of the test.(3)Effects of different exercise training durations on the rheotaxis of procypris rabaudi.The top-flow ability and number of backstrokes were significantly higher in the training group than in the control group at different exercise training durations(p<0.05).During the first 5 weeks of exercise training,the tailing amplitude of the fish in the training group and the control group showed similar trends,while during the second 2weeks of exercise training,the tailing amplitude values of the fish in the training group and the control group showed significant differences(p<0.05)at high flow rates.The tailing amplitude of the control group tended to decrease at high flow rates,whereas the tailing amplitude of the training group remained relatively stable after reaching its maximum value,and the range of variation of the tailing amplitude of the training group was smaller than that of the control group.(4)Determination of a suitable exercise training program for artificially cultured procypris rabaudi prior to stocking and releasing.A comprehensive analysis of the effects of different exercise training durations on the growth,morphology,swimming ability and rheotaxis of procypris rabaudi suggests that exercise training of juvenile rock carp at a critical swimming speed of 60% for 6hours per day for 6 weeks or more prior to release is a more appropriate exercise training program for captive-bred procypris rabaudi prior to stocking and release.