A 56‐day feeding trial was conducted to investigate the effects of replacing fish meal (FM) with soybean meal (SBM) and fermented soybean meal (FSBM) on growth performance, nutrition utilization and intestinal histology of largemouth bass. The basal diet contained 350 g/kg FM (control), and then, FM was replaced with SBM or FSBM of 15%, 30%, 45% and 60% respectively. The results showed that the specific growth rate of fish fed FSBM‐60, SBM‐45 and SBM‐60 diets significantly decreased, and the feed conversion ratio of SBM‐30, SBM‐45, SBM‐60, FSBM‐45 and FSBM‐60 groups increased when compared to the control group (p < .05). The apparent digestibility coefficients of dry matter and crude protein of SBM‐45, SBM‐60 and FSBM‐60 groups were significantly lower than those of the control group (p < .05), and the substitution of FM with SBM and FSBM (45% and 60%) significantly reduced the protein retention (p < .05). Serum total protein contents of SBM‐60 and FSBM‐60 groups and serum cholesterol contents of SBM‐45, SBM‐60 and FSBM‐60 groups were significantly lower than those of the control group (p < .05). The SBM‐30 and SBM‐60 groups showed significantly higher alanine aminotransferase activity than the control group (p < .05). The intestinal histology analysis resulted that the villus length of the SBM‐60 group and the villus width of the SBM‐45, SBM‐60 and FSBM‐60 groups decreased when compared to the control (p < .05). In conclusion, FSBM could replace 30% FM in diet of largemouth bass containing 350 g/kg FM, while the substitution level of FM with SBM was only 15%.

中文翻译：

---

在大口黑鲈（Micropterus salmoides）日粮中用发酵豆粕代替鱼粉的评估：生长，营养利用和肠道组织学

进行了为期56天的喂养试验，以研究用豆粕（SBM）和发酵豆粕（FSBM）代替鱼粉（FM）对大嘴鲈的生长性能，营养利用和肠道组织学的影响。基础饮食含有350 g / kg FM（对照），然后分别用15％，30％，45％和60％的SBM或FSBM代替FM。结果表明，饲喂FSBM-60，SBM-45和SBM-60饲料的鱼的特定增长率显着降低，SBM-30，SBM-45，SBM-60，FSBM-45和FSBM-的饲料转化率与对照组相比，增加了60组（p  <.05）。SBM‐45，SBM‐60和FSBM‐60组的干物质和粗蛋白的表观消化系数显着低于对照组（p <0.05），而FM用SBM和FSBM替代（45％和60％）显着降低了蛋白质保留（p  <.05）。SBM-60和FSBM-60组的血清总蛋白含量以及SBM-45，SBM-60和FSBM-60组的血清胆固醇含量均显着低于对照组（p  <.05）。SBM-30和SBM-60组的丙氨酸转氨酶活性明显高于对照组（p  <.05）。肠道组织学分析表明，与对照组相比，SBM-60组的绒毛长度和SBM-45，SBM-60和FSBM-60组的绒毛宽度均减小（p <.05）。总之，在含350 g / kg FM的大口黑鲈日粮中，FSBM可以替代30％的FM，而FM被SBM替代的水平仅为15％。