Oxidative stress indicators and trace element concentrations in tissues of mako shark (Isurus oxyrinchus)

Are concentrations of pollutants in sharks, rays and skates (Elasmobranchii) a cause for concern? A systematic review

“…One serving of shark meat (113 g for adults and 11-year-olds; 28 g for 2-year-olds) would expose adults and children to over three times the maximum recommended mercury consumption limit, and could lead to them experiencing toxic effects (table 2) (Mohammed and Mohammed, 2017;EPA, 2020). Similar findings were observed by the US EPA and in numerous other studies reporting on mercury in sharks (Gomes Ferreira et al, 2004;Burger and Gochfeld, 2011;Escobar-Sánchez et al, 2011;Lopez et al, 2013;Lyons et al, 2013;Olmedo et al, 2013;Vélez-Alavez et al, 2013;Man et al, 2014;Nalluri et al, 2014;Teffer et al, 2014;Corsolini et al, 2014;de Carvalho et al, 2014;Kiszka et al, 2015;Alves et al, 2016;Biton-Porsmoguer et al, 2018;Cagnazzi et al, 2019). Although the US EPA's recommendations of avoiding shark meat are in line with this study, our data indicates that their current limit of 980 ng g -1 may be underestimating the risk as average mercury concentrations in sharks exceed this value by 66% (1670 ng g -1 ).…”

Evidence of Contamination-Associated Damage in Blue Sharks (Prionace Glauca) from the Northeast Atlantic

“…Notably, organic contaminants were negatively associated with Se_GPx, which aligns with earlier observations using the same species also collected in the North Atlantic (Alves et al, 2016). These negative correlations between GPx and contaminant concentrations have also been reported for other pelagic (Vélez-Alavez et al, 2013) and coastal (Somerville et al, 2020) shark species. Most contaminants correlated negatively with ROS and LPO measured in both liver and gills.…”

Assessment of the conservation status of Chondrichthyans: underestimation of the pollution threat

“…Even naturally occurring contaminants such as PAHs and heavy metals, which have been made more bioavailable by human activities, are known to be important stress factors for marine organisms (Marsili et al 2014(Marsili et al , 2016Scheuhammer et al 2015;Santana et al 2018;Cunningham et al 2019;Lee et al 2019). Furthermore, most studies have demonstrated the existence of pollutants in Chondrichthyans and their environments (Gelsleichter & Walker 2010), but few have examined the impact and effects of chemicals on these organisms (Fuentes-Rios et al 2005;Solé et al 2010aSolé et al , 2010bBarrera-García et al 2012, 2013Vélez-Alavez et al 2013;Alves et al 2016;Marsili et al 2016;Fossi et al 2017;Cullen et al 2019;Lyons & Wynne-Edwards 2019;Ehnert-Russo & Gelsleichter 2020).…”