Crude glycerol and its purified and synthesized forms derived from biodiesel production are non‐toxic, biodegradable, biocompatible and versatile, and can be converted into various chemicals or products for biological use. Among the possible uses, there is its use in fish feeding, due to the chemical and nutritional composition, for being classified as energetic food and has low cost. The possibility of using glycerol in fish diets has been motivated by increasing maize prices, the excessive amount of glycerol produced and its processing costs for other purposes. Glycerol use in fish diet formulations is feasible, provided that certain factors be evaluated, such as digestibility and inclusion levels. In this context, this review discussed the main aspects that must be taken into account regarding glycerol use in fish diets, such as the characteristics and chemical composition of its categories, their fish metabolism pathways and their influence on fish plasma glucose. Crude glycerol or glycerine displays good potential for use in fish feed, as it contains adequate energy concentrations and can replace part of fish feed maize. However, it is evident that assessments concerning specific physiological phases, such as fish in reproductive phases, as well glycerol stability in water, are required.

中文翻译：

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甘油在鱼类营养中的应用：综述

粗甘油及其衍生自生物柴油生产的纯化和合成形式无毒，可生物降解，具有生物相容性且用途广泛，可以转化为多种化学物质或产品以用于生物用途。在可能的用途中，由于化学和营养成分的原因，其在鱼类饲养中的用途被归类为高能食品，并且成本低廉。鱼粉中使用甘油的可能性是由于玉米价格上涨，生产的甘油过多以及其用于其他目的的加工成本而引起的。在鱼饲料配方中使用甘油是可行的，前提是要评估某些因素，例如消化率和夹杂物含量。在此背景下，这篇评论讨论了鱼饲料中甘油的使用必须考虑的主要方面，例如其类别的特征和化学组成，其鱼类的代谢途径以及对鱼类血浆葡萄糖的影响。粗甘油或甘油在鱼饲料中显示出良好的潜力，因为它含有足够的能量，可以代替部分鱼饲料玉米。但是，很明显，需要对特定的生理阶段（例如鱼类在生殖阶段）以及甘油在水中的稳定性进行评估。