Study on the Growth Regularity of Siniperca chuatsi in Land-based Recirculating Aquaculture System

TIAN Tian; QIN Zhi-qing; LAI Ming-yong; LIU Yin-hua; WANG Mao-yuan; HE Guo-sen; CHEN Jin; HUANG Hong-gui

doi:10.13651/j.cnki.fjnykj.2025.10.007

Abstract：In order to explore the growth regularity of Siniperca chuatsi under the land-based recirculating aquaculture mode,the healthy Siniperca chuatsi with an initial average body weight of(49.84±7.10)g and an initial average body length of(13.11±0.68)cm were used as the research objects.According to the seedling density of 98 individuals per cubic meter(ind·m-3),a 120-day feeding trial was conducted in the land-based circulating water system(RAS).With a 30-day interval as one sampling period,the experiment was divided into four stages:stageⅠ(Days 1-30),stage Ⅱ(Days 31-60),stageⅢ(Days 61-90),and stageⅣ(Days 91-120).The body weight and body length were monitored and statistically analyzed at each stage.The results showed that:after 120 days of culture,the final average body weight of Siniperca chuatsi was(255.71±57.89)g,the final average body length was(22.05±1.78)cm,the survival rate was(93.70±2.58)%,and the feed conversion ratio was(1.19±0.02).Both the body weight and body length increased significantly with the progression of the culture stage(P＜0.05),and their relationships with the breeding days were both consistent with the quadratic function model.The fitting equations were respectively as follows:y=-5.8293 x2+88.141x-36.574(R2=0.9948)for body weight,and y=-0.4557x2+5.0083x+8.454(R2=0.9981)for body length.The relationship between body weight and body length conformed to the power function models,and the fitting equation was y=0.0199x3.0544(R2=0.986).The growth performance of Siniperca chuatsi showed distinct stage-specific differences.The body weight gain rate,specific growth rate of body weight,body length growth rate,and specific growth rate of body length were the highest in stage I and the lowest in stage Ⅳ,with significant differences among the stages(P＜0.05).The body weight growth rate was the fastest in stageⅡ,with a daily weight gain of(2.43±0.06)g.The body length growth rate was the fastest in stageⅠand stageⅡ,with a daily growth of(0.10±0.01)cm in both stages.In conclusion,under the land-based RAS,the growth of Siniperca chuatsi exhibited an obvious phased pattern.For the practical production,precisely identifying the inflection point of its growth rate and implementing the pond-separated management accordingly were the key technical measures to optimize the aquaculture process,shorten the culture cycle,and improve the aquaculture efficiency.