投喂频率对陆基推水集装箱养殖大口黑鲈生长的影响

Effects of feeding frequency on the growth of Micropterus salmoides cultured in land-based water push container

本实验旨在研究投喂频率对陆基推水集装箱(简称"陆基集装箱")养殖大口黑鲈(Micropterus salmoides)生长的影响,以确定大口黑鲈在养殖过程中适宜的投喂频率。本实验选取初始体质量为(162.53±2.15)g,体长为(18.84±0.15)cm的大口黑鲈进行养殖,在陆基集装箱养殖模式下,全程采用大口黑鲈专用配合饲料进行投喂。每箱养殖密度均为70尾/m3,设2次/d(F2)、3次/d(F3)、4次/d(F4)三个投喂频率组,每组设置三个重复,实验周期为90 d,分别在实验的第30、60、90天从每箱中随机捞取30尾鱼进行测量分析。结果显示:养殖用水中的氨氮和亚硝态氮含量随着投喂频率的增加而增加;溶解氧含量随着投喂频率的增加而减少;生长速度、摄食率、饵料系数随着投喂频率的增加而增加;肥满度随着投喂频率的增加无明显变化;成活率随着投喂频率的增加而降低。三组间在氨氮、亚硝态氮、溶解氧、生长速度、摄食率、饵料系数、肥满度和成活率方面,差异均不显著。结果表明,本研究中陆基集装箱养殖大口黑鲈最适宜投喂频率为2次/d。

The largemouth bass with initial body weight of(162.53±2.15) g and body length of(18.84±0.15) cm were selected for breeding to investigate the effect of feeding frequency on the growth of largemouth bass(Micropterus salmoides) cultured in land-based container with recycling water for aquaculture(C-RAS).Meanwhile, the stocking density was 70 fish/m3.Three feeding frequencies of 2 times/d, 3 times/d and 4 times/d(F2,F3 and F4 groups, respectively) were set up with three replicates in each group.The experimental period was 90 days, and 30 fish were randomly collected from each container on the 30 th, 60 th and 90 th days of the experiment.Results showedthat the ammonia nitrogen and nitrate-nitrogen in aquaculture water increased with the increase of feeding frequency.The dissolved oxygen decreased with the addition of the feeding frequency.The growth rate, feeding rate and feed coefficient increased with the increase of feeding frequency.The condition factor did not change significantly with feeding frequency.The survival rate decreased with the growth of feeding frequency.In conclusion, the optimal feeding frequency of largemouth bass cultured in C-RAS mode was 2 times/d in this study.