Facultad de Artes Y Ciencias Liberales, Universidad de Especialidades Espíritu Santo (UEES), Escuela de Ciencias Ambientales, Km 2.5 vía La Puntilla, C.P. 092301, Guayaquil, Ecuador.
Facultad de Ciencias del Mar, Programa de Doctorado en Ciencias Con Mención en Recursos Acuáticos, Universidad Autónoma de Sinaloa, Paseo Clausen S/N, C.P. 82000, Mazatlán, Mexico.
Biol Trace Elem Res. 2022 Jul;200(7):3400-3411. doi: 10.1007/s12011-021-02932-7. Epub 2021 Oct 2.
Blue sharks (Prionace glauca) are an important resource in Ecuador's fisheries; however, biological and ecological information of this species in the area is scarce. The goal of this study was to determine Hg and Cd concentration levels in muscle tissue, as well as its relationship with size, sex, and sexual maturity stages. A total of 80 specimens (34 females and 46 males) collected from the Ecuadorian longline fishing fleet between June and December 2012 were examined. Sizes for females ranged from 97 to 280 cm total length, with values of Hg between 0.20 to 2.38 mg kg wet weight (x̄ = 0.71, ± 0.61) and values of Cd between 0.01 and 0.12 mg kg (x̄ = 0.04, ± 0.02). Sizes for males ranged from 137 to 290 cm TL with values of Hg between 0.17 and 2.94 mg kg (x̄ = 0.81, ± 0.68) and Cd concentrations between 0.01 and 0.12 mg kg (x̄ = 0.04, ± 0.03). A Spearman's rank correlation showed a medium positive association between TL and Hg concentrations (ρ = 0.66; p < 0.05), but there was no correlation between TL and Cd concentrations (ρ = 0.00, p < 0.05). Of the analyzed sharks, 46% and 20% had Hg and Cd concentrations, respectively, greater than the limit established by authorities for fishes consumed by humans.
蓝鲨（Prionace glauca）是厄瓜多尔渔业的重要资源；然而，该物种在该地区的生物学和生态学信息却很少。本研究的目的是确定肌肉组织中汞和镉的浓度水平，以及其与大小、性别和性成熟阶段的关系。总共检查了 2012 年 6 月至 12 月期间厄瓜多尔延绳钓船队捕捞的 80 个标本（34 只雌性和 46 只雄性）。雌性的大小范围从 97 到 280 厘米总长度，汞值在 0.20 到 2.38 毫克/公斤湿重之间（x̄=0.71，±0.61），镉值在 0.01 到 0.12 毫克/公斤之间（x̄=0.04，±0.02）。雄性的大小范围从 137 到 290 厘米 TL，汞值在 0.17 到 2.94 毫克/公斤之间（x̄=0.81，±0.68），镉浓度在 0.01 到 0.12 毫克/公斤之间（x̄=0.04，±0.03）。Spearman 秩相关显示 TL 和 Hg 浓度之间存在中度正相关（ρ=0.66；p<0.05），但 TL 和 Cd 浓度之间没有相关性（ρ=0.00，p<0.05）。在所分析的鲨鱼中，46%和 20%的 Hg 和 Cd 浓度分别超过了当局为人类食用鱼类设定的限量。
