Human consumption of the thornback guitarfish (Platyrhinoidis triseriata) is concentrated in coastal populations of the Pacific coast of Mexico as its meat is prized for its high quality. This study analyzes the distribution of mercury and selenium in the muscle and liver of Platyrhinoidis triseriata and the risk to human health associated with its consumption. In order to conduct these estimates, specimens were collected from the Eastern Pacific Ocean in 2015 and 2016 and found mean concentrations (µg g⁻¹ wet weight) of mercury ranging from 0.02 to 0.58 in muscle and 0.10 to 0.31 in liver. Selenium ranged from 0.14 to 1.31 in muscle and from 0.93 to 4.52 in liver. Mercury levels in the muscle of P. triseriata were significantly correlated (positive correlation) with the total length of the specimens. The predominant prey of P. triseriata was the shrimp Pleuroncodes planipes and according to the biomagnification factor, only mercury was biomagnified. The risk to consumers associated with the simultaneous presence of mercury and selenium in the muscle and liver of rays under the selenium health benefit value approach indicated that consumption of P. triseriata from this area is beneficial to human health.

刺背吉他鱼（Platyrhinoidis triseriata）的人类消费集中在墨西哥太平洋沿岸的沿海人群中，因为它的肉因其高品质而备受推崇。本研究分析了三叶草肌肉和肝脏中汞和硒的分布，以及与其消耗相关的人类健康风险。为了进行这些估计，2015 年和 2016 年从东太平洋采集了样本，发现肌肉中汞的平均浓度（μg g ^-1湿重）为 0.02 至 0.58，肝脏中为 0.10 至 0.31。肌肉中的硒含量为 0.14 至 1.31，肝脏中的硒含量为 0.93 至 4.52。P. triseriata肌肉中的汞含量与标本的总长度显着相关（正相关）。P. triseriata的主要猎物是虾Pleuroncodes planipes，根据生物放大因子，只有汞被生物放大。在硒健康益处值方法下，与同时存在于射线的肌肉和肝脏中的汞和硒相关的消费者面临的风险表明，从该地区消费P. triseriata对人类健康有益。