College of Charleston: Grice Marine Laboratory, 205 Fort Johnson Rd, Charleston, SC, 29412, USA.
South Carolina Department of Natural Resources Marine Resources Research Institute, 217 Fort Johnson Rd, Charleston, SC, 29412, USA.
Environ Monit Assess. 2021 Aug 14;193(9):574. doi: 10.1007/s10661-021-09299-1.
In fish consumption advisories pertaining to Hg, grouper species in the family Serranidae are often lumped together and labeled generically as Grouper. However, grouper species vary considerably in growth rate, maximum age, and maximum size. This study examined the variability of Hg concentrations and bioaccumulation rates (increase of Hg concentrations in relation to age) for populations of three long-lived, slow-growing, protogynous hermaphrodite grouper species, gag Mycteroperca microlepis, scamp M. phenax, and red grouper Epinephelus morio, which are commercially and recreationally important in the offshore waters of the US southeastern region. A total of 268 samples from the three grouper species were processed for Hg analysis from 2013-2015. Concentrations of Hg ranged from 0.03 to 0.87 ppm wet weight, with a mean of 0.30 ppm. Gag accumulated Hg at a faster rate (as measured by the increase of Hg with fish age) than the other two species. Size, age, and δN were significant predictors for Hg in the two Mycteroperca species, while size and age were significant predictors for Hg in red grouper. Two of the three species had mean Hg concentrations within the one meal per week "Good Choices" consumption category (red grouper and scamp), and one species (gag) had a mean Hg level within the two meals per week "Good Choices" consumption category as advised by the US EPA and US FDA. These results support the separation of grouper species in advisories.
在与汞有关的鱼类消费建议中,石斑鱼科的石斑鱼通常被归为一类,并被笼统地标记为“石斑鱼”。然而,石斑鱼的生长速度、最大年龄和最大体型差异很大。本研究考察了三种长寿、生长缓慢、雌雄同体的石斑鱼种群(波纹唇鱼 Mycteroperca microlepis、短尾胡椒鲷 M. phenax 和红鳍笛鲷 Epinephelus morio)的汞浓度和生物累积率(汞浓度随年龄的增加而增加)的变异性,这些石斑鱼在美国东南部近海水域具有商业和娱乐价值。从 2013 年至 2015 年,共对这三种石斑鱼的 268 个样本进行了汞分析处理。汞浓度范围为 0.03 至 0.87 ppm 湿重,平均值为 0.30 ppm。与其他两种石斑鱼相比,波纹唇鱼积累汞的速度更快(以汞随鱼龄增加的速度衡量)。大小、年龄和δN 是两种波纹唇鱼中汞的重要预测因子,而大小和年龄是红鳍笛鲷中汞的重要预测因子。三种石斑鱼中有两种(红鳍笛鲷和短尾胡椒鲷)的平均汞浓度处于每周一顿“良好选择”消费类别(美国环保署和美国食品药品监督管理局建议每周食用一到两份),有一种(波纹唇鱼)的平均汞水平处于每周两顿“良好选择”消费类别。这些结果支持在建议中对石斑鱼进行分类。