Gongora-Gomez et al. 2017 - Metals in Gulf of California oysters
This study measured heavy metals in cultivated Pacific oysters from the southeastern Gulf of California. It is directly routeable for shellfish occurrence evidence because the edible oyster matrix was analyzed and the paper reports tissue concentrations.
Key numbers
- Reported mean dry-weight concentrations in oyster tissue were Cu 51.42 +/- 25.92 ug/g, Cr 24.97 +/- 32.38 ug/g, Cd 13.84 +/- 4.22 ug/g, Ni 10.26 +/- 12.18 ug/g, Pb 2.18 +/- 1.28 ug/g, total As 0.37 +/- 0.08 ug/g, Zn 267.42 +/- 92.29 ug/g, and total Hg 0.02 +/- 0.01 ug/g.
- The authors state that Cu, Cr, Cd, and Pb fresh-weight levels were above the permissible values used for comparison.
Methods
The paper analyzed cultivated Crassostrea gigas oysters and reports metal concentrations in tissue. The source distinguishes dry-weight tissue values from regulatory comparisons expressed on a fresh-weight basis.
Implications
The source supports Mexican shellfish occurrence context for Cd, Pb, Cr, Ni, total As, and total Hg. Dry-weight and fresh-weight statements should not be mixed without explicit conversion.
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Verification notes
Arsenic and mercury are treated as total-element measurements because the source does not report inorganic arsenic or methylmercury speciation. The oyster species is Crassostrea gigas; the frontmatter keeps the matrix broad enough for routing while the title and sample population retain the species.
Page history
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