Heavy metal concentrations in diploid and triploid oysters (Crassostrea gigas) from three farms on the north-central coast of Sinaloa, Mexico

Abstract

The concentrations of Cu, Cd, Pb, Zn, and Hg in diploid and triploid oysters from three farms (Guasave, Ahome, and Navolato) on the north-central coast of Sinaloa, Mexico, were assessed based on samples recovered during a single culture cycle 2013-2014. Metal burdens were more strongly correlated (p < 0.05) with the location of the farm than with either the ploidy or the interaction of both variables. The metal concentration ranking for oysters of both ploidies from the three farms was Zn > Cu > Cd > Pb > Hg. For all three farms, the mean concentrations of Cd and Pb in Crassostrea gigas were high, ranging from 2.52 to 7.98 μg/g wet weight for Cd and from 0.91 to 2.83 μg/g wet weight for Pb. Diploid and triploid oysters from the Guasave farm contained high levels of Cu (76.41 and 68.97 μg/g wet weight, respectively). Cu, Cd, and Zn were highly correlated (p < 0.05), and their concentrations may be influenced by agrochemical inputs. The mean levels of Cu for the Guasave farm and of Cd and Pb for all three farms exceeded permissible limits and represented a threat to human health during the sampling period (July 2014 to July 2014).

Health risk of consuming Sphoeroides spp. from the Navachiste Lagoon Complex due to its trace metals and organochlorine pesticides content

“…The Ni values of the edible tissue of Sphoeroides spp. were higher to those reported in recent studies on other marine species of the region [35, 47,67,80,81]. However, the concentration of Ni in predatory shes has been reported to be slightly higher than those in herbivorous and omnivorous species [79].…”

Influence of gonadal development on metal accumulation in the Portuguese oyster,Crassostrea angulata,in subtropical areas

“…The difference of metal concentration between triploid and diploid oysters (somatic tissue) was not significant either. Amiard et al () and Sevilla et al () also found metal bioaccumulation patterns and metal concentrations to be similar for both ploidies, and the major factor governing metal accumulation by oysters was influenced by the levels of metal in the water. Considering that triploid oysters do not have reproduction throughout the year, this further indicated that gonadal development did not affect metal accumulation in somatic tissue.…”

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“…capax de la zona de muestreo. Específicamente, en la costa este de Baja California Sur, se desarrollan diversas actividades antropogénicas (urbanización, turismo, pesquería y minería, Romero-Gil, 1991) distintas a las que se realizan a lo largo de la costa este del Golfo de California, donde predomina la agricultura intensiva, acuacultura y manufactura, entre otras (Frías-Espericueta et al, 2011;Muñoz-Sevilla et al, 2017) y cuyos efectos en algunas especies de moluscos han sido reportados. Por ejemplo, Yee-Duarte et al (2017, 2018 revelaron desórdenes fisiológicos reproductivos en la almeja chocolata M. squalida asociados a compuestos tóxicos en la zona de nuestro muestreo.…”