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Methylmercury Levels in Commercially Harvested Spiny Dogfish Captured off the Coast of Massachusetts
Transactions of the American Fisheries Society ( IF 1.4 ) Pub Date : 2020-06-26 , DOI: 10.1002/tafs.10243
George A. Maynard 1 , Zofia Baumann 2
Affiliation  

Spiny Dogfish Squalus acanthias are small sharks that are harvested for seafood, primarily off the Eastern Seaboard of the United States. For the purposes of establishing seafood consumption advisories with regard to methylmercury (MeHg) content, the U.S. Food and Drug Administration (FDA) classifies Spiny Dogfish as “sharks,” an overly broad taxonomic grouping with a mean MeHg content of 0.98 μg/g wet weight. Because the FDA mean includes fishes of different species that have been collected internationally over the last four decades, there is reason to believe that the FDA mean value is not reflective of the fish harvested in the Spiny Dogfish fishery. To evaluate how closely Spiny Dogfish match the values in the FDA’s generic shark category, we collected muscle samples from 102 commercially harvested Spiny Dogfish caught off Cape Cod, Massachusetts, during the 2018 fishing season. Among the fish we sampled, 100% had MeHg concentrations lower than the FDA mean for sharks and 77.5% had MeHg concentrations that the FDA considers safe for consumption at a frequency of once per week. The mean MeHg concentration in our samples was 0.378 μg/g wet weight, less than half of the value for the generic shark category. Moreover, through a comparison with data from the 1970s, we documented a 30% decline in MeHg concentrations for select size categories of Spiny Dogfish captured off the coast of New England. Exposure simulations indicated that to minimize risk, Spiny Dogfish should be consumed no more than twice per month by most people.

中文翻译:

在马萨诸塞州沿海捕获的商业收获的带刺Dog鱼中甲基汞的水平

刺Dog鱼角鲨是捕捞海鲜的小鲨鱼,主要是在美国东部沿海以外的地方。为了建立有关甲基汞(MeHg)含量的海鲜消费咨询意见,美国食品和药物管理局(FDA)将多刺Dog鱼归类为“鲨鱼”,这是一个分类过于广泛的分类,平均MeHg含量为0.98μg/ g湿重量。由于FDA的平均值包括过去四十年来国际范围内收集的不同物种的鱼类,因此有理由相信FDA的平均值无法反映多刺多鱼渔业中收获的鱼类。为了评估多刺Dog鱼与FDA通用鲨鱼类别中的值的匹配程度,我们从马萨诸塞州科德角附近捕获的102种商业化收获的多刺commercially鱼中采集了肌肉样本,在2018捕鱼季节。在我们取样的鱼中,有100%的MeHg浓度低于FDA对鲨鱼的平均含量,而77.5%的MeHg浓度被FDA认为可以每周安全食用一次。我们样品中的平均MeHg浓度为0.378μg/ g湿重,不到普通鲨鱼类别的一半。此外,通过与1970年代的数据进行比较,我们记录了在新英格兰沿海捕获的某些大小棘刺categories鱼的甲基汞浓度下降了30%。暴露模拟表明,为使​​风险最小化,大多数人每月应食用刺多鱼不超过两次。5%的MeHg浓度以FDA每周一次的频率食用是安全的。我们样品中的平均MeHg浓度为0.378μg/ g湿重,不到普通鲨鱼类别的一半。此外,通过与1970年代的数据进行比较,我们记录了在新英格兰沿海捕捞的某些大小棘刺of鱼的甲基汞浓度下降了30%。暴露模拟表明,为最大程度地降低风险,大多数人每月应食用刺多鱼不超过两次。5%的FDA认为MeHg浓度可以安全食用,每周一次。我们样品中的平均MeHg浓度为0.378μg/ g湿重,不到普通鲨鱼类别的一半。此外,通过与1970年代的数据进行比较,我们记录了在新英格兰沿海捕获的某些大小棘刺categories鱼的甲基汞浓度下降了30%。暴露模拟表明,为使​​风险最小化,大多数人每月应食用刺多鱼不超过两次。我们记录到,在新英格兰海岸附近捕获的某些大小的刺Dog鱼的甲基汞浓度下降了30%。暴露模拟表明,为使​​风险最小化,大多数人每月应食用刺多鱼不超过两次。我们记录到,在新英格兰海岸附近捕获的某些大小的刺Dog鱼的甲基汞浓度下降了30%。暴露模拟表明,为最大程度地降低风险,大多数人每月应食用刺多鱼不超过两次。
更新日期:2020-06-26
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