The peacock-tail shrimp Ancylocaris brevicarpalis Schenkel, 1902, is an obligate symbiont of sea anemones and well known for its remarkable colouration. Yet, very little information is available about its population structure and life-history traits, including reproductive parameters (fecundity, embryo volume and reproductive output). A total of 574 individuals were collected from the Gulf of Mannar, Tamil Nadu, India between February 2017 and July 2018, out of which 214 were males (37.28%), 355 were females (61.84%), and 5 (0.87%) juveniles. The highest percentage of individuals were observed in the post-monsoon season (38.10%) followed by monsoon (34.85%), pre-monsoon (15.02%), and summer seasons (12.01%). The overall sex ratio was skewed towards female individuals (0.55 male: 1 female). Fecundity was higher in females carrying early-stage embryos and embryo volume did increase, but not statistically significantly from early to late stages. The reproductive output was negatively allometric to the mean female body weight. The present study provides first-of-its-kind information on the population as well as individual-level reproductive characteristics of A. brevicarpalis.

中文翻译：

---

海葵伴生虾 Ancylocaris brevicarpalis (Caridea: Palaemonidae) 的种群结构和繁殖性能

孔雀尾虾短腕带鱼Schenkel，1902，是海葵的专性共生体，以其非凡的颜色而闻名。然而，关于其种群结构和生活史特征的信息非常少，包括生殖参数（繁殖力、胚胎体积和生殖产量）。2017 年 2 月至 2018 年 7 月期间，在印度泰米尔纳德邦马纳尔湾共采集了 574 只个体，其中雄性 214 只（37.28%），雌性 355 只（61.84%），幼鱼 5 只（0.87%） . 在季风后季节（38.10%）观察到的个体比例最高，其次是季风（34.85%）、季风前（15.02%）和夏季（12.01%）。总体性别比例偏向于女性（0.55 男性：1 女性）。携带早期胚胎的雌性生殖力更高，胚胎体积确实增加了，但从早期到晚期没有统计学意义。生殖输出与平均女性体重呈负异速关系。本研究提供了关于种群以及个体水平生殖特征的首创信息A. brevicarpalis。