This study evaluates the potential to replace fish meal with gamma-ray (γ) irradiated soybean meal (SM) in the diet of largemouth bass (Micropterus salmoides) and the role of brewer's yeast (Saccharomyces cerevisiae) supplementation in fish meal replacement. The reference diet (490 g kg⁻¹ crude protein, 90 g kg⁻¹ lipid and 400 g kg⁻¹ fish meal) was formulated into six isoproteic and isolipidic experimental diets. In the first three diets (S20, S40 and S60), 20%, 40% and 60% of fish meal in the reference diet was replaced with γ-irradiated SM, respectively. The brewer's yeast was then supplemented to diets S20, S40 and S60 at 10 g kg⁻¹ to form other three diets (SY20, SY40 and SY60). The feeding trial lasted 8 weeks. Fish weight gain was not affected by the level of fish meal replacement, yeast supplementation and their interactions. Fish meal replacement and yeast supplementation significantly affected feed intake, feed conversion ratio (FCR), retention efficiencies of nitrogen (NRE) and phosphorus (NRE), nitrogen waste, phosphorus waste and the ratio of fish meal consumption to fish production (RCP). The hepatosomatic index and body contents of moisture and lipid were dependent on the level of fish meal replacement. The contents of protein, ash and phosphorus in the whole body depended on fish meal replacement and the interaction between fish meal replacement and yeast supplementation. No significant difference was found in weight gain between fish fed the reference diet and six experimental diets. Feed intake and FCR were lower in fish fed the reference diet than those fed diets S20, S40, S60, SY20 and SY60. However, feed intake, FCR, NRE and nitrogen waste in fish fed diet SY40 did not differ from those fed the reference diet. The RCP declined with the decrease of dietary fish meal. This study indicates that the γ-irradiated SM is a promising ingredient as a fish meal substitute. Fish meal can be reduced to 160 g kg⁻¹ with γ-irradiated SM as the substitute in the largemouth bass diet. The supplementation of S. cerevisiae at 10 g kg⁻¹ did not show a positive role for the reduction of fish meal in the largemouth bass diet.

中文翻译：

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用伽马射线辐照豆粕替代大口黑鲈鱼饵料中的鱼粉

本研究评估了在大口黑鲈（Micropterus salmoides）饮食中用伽马射线（γ）辐照豆粕（SM）替代鱼粉的潜力以及啤酒酵母（酿酒酵母）补充剂在鱼粉替代中的作用。将参考日粮（490 g kg ^-1粗蛋白、90 g kg ^-1脂质和400 g kg ^-1鱼粉）配制成六种等蛋白和等脂实验日粮。在前三种日粮（S20、S40 和 S60）中，参考日粮中 20%、40% 和 60% 的鱼粉分别被 γ 辐照的 SM 替代。然后将啤酒酵母以 10 g kg ^-1添加到日粮 S20、S40 和 S60 中形成其他三种饮食（SY20、SY40 和 SY60）。喂养试验持续了8周。鱼的增重不受鱼粉替代水平、酵母补充剂及其相互作用的影响。鱼粉替代和酵母补充显着影响饲料摄入量、饲料转化率 (FCR)、氮 (NRE) 和磷 (NRE) 的保留效率、氮废物、磷废物以及鱼粉消费与鱼类产量 (RCP) 的比率。肝体指数和体内水分和脂质含量取决于鱼粉替代品的水平。全身蛋白质、灰分和磷的含量取决于鱼粉替代品以及鱼粉替代品与酵母补充剂之间的相互作用。喂食参考饮食和六种实验饮食的鱼的体重增加没有显着差异。饲喂参考日粮的鱼的采食量和 FCR 低于饲喂 S20、S40、S60、SY20 和 SY60 日粮的鱼。然而，饲喂 SY40 日粮的鱼的采食量、FCR、NRE 和氮废物与饲喂参考日粮的鱼没有差异。RCP随着日粮鱼粉的减少而下降。这项研究表明，γ 辐照的 SM 是一种很有前途的鱼粉替代成分。鱼粉可减至160克/公斤 这项研究表明，γ 辐照的 SM 是一种很有前途的鱼粉替代成分。鱼粉可减至160克/公斤 这项研究表明，γ 辐照的 SM 是一种很有前途的鱼粉替代成分。鱼粉可减至160克/公斤^-1用 γ 辐照的 SM 作为大口黑鲈饮食中的替代品。在大口黑鲈饮食中添加10 g kg ^{-1 的}酿酒酵母对减少鱼粉没有显示出积极作用。