Studies on the nutrition of wild populations of freshwater prawns, valuable in the determination of feeding habits and requirements, are scarce or inadequate. We analyzed the digestive tract of individuals of Macrobrachium tenellum (Smith, 1871) (Palaemonidae) sampled from three different coastal habitats (an estuary, a lagoon, and a river) in the southeastern Mexico Pacific coast to determine if individuals show any variations in their enzymatic activities. Prawns of different size (adult or juvenile) showed the most significant differences among them in the kind and amount of enzyme activity, whereas location and sex differences resulted in less significant differences. Results suggest that feeding habits and not habitat, are the main cause of differences between age classes.

中文翻译：

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来自不同生境的野生长臂河虾，Macrobrachium tenellum（Smith，1871）（十足目：Caridea：Palaemonidae）在酶活性上的差异

对淡水虾野生种群营养的研究在确定其摄食习惯和需求方面很有价值，但研究不足或不足。我们分析了沼虾（Macrobrachium tenellum）（史密斯（Smith，1871）（ala科）从墨西哥东南太平洋的三个不同沿海生境（河口，泻湖和河流）采样，以确定个人的酶活性是否表现出任何变化。不同大小的虾（成年或幼虾）在酶活性的种类和数量上表现出最大的差异，而位置和性别的差异导致差异较小。结果表明，进食习惯而不是栖息地是造成年龄段差异的主要原因。