Lysmata vittata is considered an invasive shrimp in the Atlantic Ocean and some characteristics might have contributed to its invasive success, such as its larval nutritional vulnerability during the early stages of development. The objective of this study was to evaluate the early larval stages of the shrimp L. vittata. Ovigerous specimens were captured in an estuarine region of north-eastern Brazil. Zoeae were assigned to two experiments: (1) the point of no return (PNR), consisting of treatments with an increasing number of days of starvation and subsequent days of feeding; and (2) the point of reserve saturation (PRS), consisting of treatments with an increasing number of days of feeding and subsequent days of starvation. Two control groups were considered: continuous starvation (CS) and continuous feeding (CF). Nutritional vulnerability was estimated by the time when 50% of the initially starved larvae (PNR50) lost the ability to moult to the next stage, when 50% of the initially fed larvae (PRS50) were capable of moulting to the next stage. In the CF, the mean development time (±SD) of the larvae that reached stage III was 4.36 ± 0.74 days with a mortality of 70%, and the mean carapace length (±SD) was 0.61 ± 0.04 mm CL. The PNR50 and PRS50 were 2.42 ± 0.14 and 1.32 ± 0.83 days, respectively. The nutritional vulnerability index (PRS50/PNR50 = 0.54) indicates that L. vittata presents intermediate dependence on exogenous food during the early larval stages, which might help our understanding of the invasive potential of this species in the Atlantic Ocean.

中文翻译：

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大西洋入侵虾 Lysmata vittata (Decapoda: Caridea) 早期动物阶段的营养脆弱性

荸荠被认为是大西洋中的入侵虾，一些特征可能有助于其入侵成功，例如其在发育早期的幼虫营养脆弱性。本研究的目的是评估虾的早期幼虫阶段L. vittata. 在巴西东北部的河口地区捕获了多头标本。Zoaee 被分配到两个实验：（1）不归路（PNR），包括饥饿天数增加和随后喂食天数的处理；(2) 储备饱和点 (PRS)，包括饲养天数增加和随后饥饿天数的处理。考虑了两个对照组：连续饥饿（CS）和连续喂养（CF）。营养脆弱性是在 50% 最初饥饿的幼虫（PNR50) 失去了换羽到下一阶段的能力，当 50% 的最初喂养的幼虫 (PRS50) 能够蜕皮到下一阶段。在CF中，达到III期的幼虫的平均发育时间（±SD）为4.36±0.74天，死亡率为70％，平均甲壳长度（±SD）为0.61±0.04 mm CL。PNR50和 PRS50分别为 2.42 ± 0.14 和 1.32 ± 0.83 天。营养脆弱性指数（PRS50/PNR50= 0.54) 表明L. vittata在早期幼虫阶段表现出对外源食物的中间依赖，这可能有助于我们了解该物种在大西洋的入侵潜力。