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Abstract

Selenium’s (Se) protective effects against mercury (Hg) toxicity have been demonstrated; however, this is
seldom considered in health assessments, where dietary exposure is still evaluated by Hg concentration
alone. Se:Hg ratios and selenium health benefit values (Se HBVs) offer a more comprehensive seafood
safety model. Here we describe total mercury (THg), methylmercury (MeHg) and Se concentrations in fish
from a Hg-polluted estuary. Spatial variation in THg, MeHg and Se was evident, though all regions maintained
Se:Hg ratio values >1. Se HBV varied between regions and in one region mean negative values
(5.17) were evident. This study provides the first evidence that quoting a single all-encompassing Se
HBV is not appropriate when species demonstrate strong site fidelity. It highlights the need for research
into Se–Hg relationships in environments with established Hg pollution and reinforces the assertion that
Se concentration be considered in assessments of human health risk to Hg exposure.

Item Type:	Article
Authors/Creators:	Jones, HJ and Butler, ECV and MacLeod, CK
Keywords:	Platycephalus bassensis, Derwent Estuary, Seafood safety, Contaminant assessment, Se health benefit value (Se HBV)
Journal or Publication Title:	Marine Pollution Bulletin
ISSN:	0025-326X
DOI / ID Number:	10.1016/j.marpolbul.2013.06.052
Additional Information:	Copyright 2013 Elsevier
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