The present study provided the first information about the population structure, reproduction, growth and mortality rates of Upogebia omissa Gomes Corrêa, 1968 from the southwestern Atlantic coast. Shrimp were collected monthly between October 2011 and October 2012. A total of 1578 specimens were examined. The overall sex ratio was significantly male-biased. Carapace length ranged from 2.9 mm to 12.91 mm for males and from 4.27 mm to 11.77 mm for females. The von Bertalanffy growth parameters were estimated as: L$\infty$ = 13.90 mm, $K$ = 0.7 yr^-1, $C$ = 0.85 for males and L$\infty$ = 12.20 mm, $K$ = 0.8 yr^-1, $C$ = 0.85 for females. The slow-growth phase of females occurred in the dry season (November–December) and of males in the rainy season (March). The Growth Performance Index ($\Phi$’) was compatible with those reported for other burrowing shrimps and indicated different growth patterns for males and females. The estimated 3 to 4-year life span is similar to other upogebiids. Natural mortality was estimated at 1.05 yr^-1 for males and 1.27 yr^-1 for females. Reproduction was continuous. Recruitment occurred mainly in the rainy season. The smallest ovigerous female had a carapace length of 6.33 mm. Fecundity ranged from 450 to 6250 eggs per female and was positively related to individual size. This study contributes to the understanding of life-history strategies of mud shrimps and establishes a baseline for future monitoring programmes and conservation of this species, which is potentially threatened by habitat change and fishing pressure.

本研究提供了有关西南大西洋沿岸1968年小Up虫种群结构，繁殖，生长和死亡率的第一个信息。在2011年10月至2012年10月之间每月收集一次虾。共检查了1578个标本。总体性别比例明显偏重男性。雄性的甲壳长度为2.9mm至12.91mm，雌性的甲壳长度为4.27mm至11.77mm。von Bertalanffy的生长参数估计为：L$\infty$ = 13.90毫米， $ķ$= 0.7年^-1，$C$=男性和L为0.85$\infty$ = 12.20毫米， $ķ$= 0.8年^-1，$C$= 0.85（女性）。女性的缓慢生长阶段发生在旱季（11月至12月），男性的发生在雨季（3月）。增长绩效指数（$\Phi$'）与报道的其他穴居对虾相容，并表明雄性和雌性的生长方式不同。估计的3至4年寿命与其他upogebiids相似。男性的自然死亡率估计为1.05 yr ^-1，女性为1.27 yr ^-1。繁殖是连续的。招聘主要发生在雨季。最小的有卵的雌性的甲壳长度为6.33mm。产卵量为每只雌性450至6250个卵，与个体大小呈正相关。这项研究有助于了解泥虾的生活史策略，并为今后的监测计划和该物种的保护建立了基线，该基线可能受到栖息地变化和捕鱼压力的威胁。