Comparison of mercury bioaccumulation between wild and mariculture food chains from a subtropical bay of Southern China

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

15 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)39-49
Journal / PublicationEnvironmental Geochemistry and Health
Volume38
Issue number1
Online published15 Jan 2015
Publication statusPublished - Feb 2016
Externally publishedYes

Abstract

Bioaccumulation and trophic transfer of mercury (Hg) both in the natural marine ecosystem and the mariculture ecosystem were studied at Daya Bay, a subtropical bay in Southern China. Averaged Hg concentrations in sediment, phytoplankton, macrophyte, shrimp, crab, shellfish, planktivorous fish, carnivorous fish, farmed pompano, farmed snapper, compound feed and trash fish were 0.074, 0.054, 0.044, 0.098, 0.116, 0.171, 0.088, 0.121, 0.210, 0.125, 0.038 and 0.106 μg g−1 dw, respectively. These Hg levels were at the low–middle ends of the global range. Positive correlation between Hg concentrations in farmed fish and fish weights/sizes was observed, whereas no clear correlation between Hg concentrations and lipid contents was found. Hg concentrations followed macrophyte < phytoplankton < sediment < planktivorous fish < shrimp < crab < carnivorous fish < shellfish, and commercial feed < trash fish < farmed fish. Hg was biomagnified along the marine food chain in the ecosystem of Daya Bay. Hg levels in the farmed fish were higher than those in the wild fish primarily because of the higher Hg level in fish feed and the smaller size of marine wild fish.

Research Area(s)

  • Bioaccumulation, Daya Bay, South China, Fish feed, Food webs, Mercury (Hg), Phytoplankton