We report the reproductive strategy of the speckled guitarfish, Pseudobatos glaucostigmus, a poorly studied elasmobranch caught in the south-eastern Gulf of California. Of 2068 specimens collected from the artisanal and industrial shrimp trawl fisheries, 1073 were females and 995 males. The sex ratio of adults and embryos did not deviate significantly from 1:1 overall or during summer, but significant differences in the other months suggest a temporal sexual segregation. Monthly records of maturity stages, gonado-somatic index, and development of oocytes suggested an annual cycle (May to July) with a gestation period of 6 months (May to October). Parturition began mainly in June, with vitellogenesis and embryonic development being concurrent. Median size-at-maturity for males (50.72 cm TL) was smaller than females (52.58 cm TL), which reached a size-at-maternity of 59.41 cm TL. Fecundity was 1–9 embryos (mean 4 embryos) and increased with maternal body size and weight. From ovulation to parturition, gestation was around 6 months with a possible presence of embryonic diapause. The information presented in this study will establish the baseline for population dynamic and demographic models to determine the stock productivity and establish strategies for the conservation and management of this species in the Gulf of California.

我们报告了斑点吉他鱼Pseudobatos glaucostigmus的繁殖策略，在加利福尼亚湾东南部捕获的一种研究不足的elasmobranch。在从手工和工业拖网捕虾渔业收集的 2068 份标本中，1073 份为雌性，995 份为雄性。成虫和胚胎的性别比例总体上或在夏季没有显着偏离 1:1，但其他月份的显着差异表明存在时间性的性别隔离。成熟阶段、性腺体细胞指数和卵母细胞发育的月度记录表明一年周期（5 月至 7 月），妊娠期为 6 个月（5 月至 10 月）。分娩主要在 6 月份开始，卵黄生成和胚胎发育同时进行。雄性的平均成熟期体型 (50.72 cm TL) 小于雌性 (52.58 cm TL)，后者达到了 59.41 cm TL 的孕产期体型。繁殖力为 1-9 个胚胎（平均 4 个胚胎），并且随着母体的体型和体重而增加。从排卵到分娩，妊娠期约为 6 个月，可能存在胚胎滞育。本研究中提供的信息将为种群动态和人口模型建立基线，以确定种群生产力，并为加利福尼亚湾该物种的保护和管理制定战略。