BIOAVAILABILITY OF PURIFIED SUBCELLULAR METALS TO A MARINE FISH

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

3 Scopus Citations
View graph of relations

Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)2109-2116
Journal / PublicationEnvironmental Toxicology and Chemistry
Volume32
Issue number9
Online published22 May 2013
Publication statusPublished - Sep 2013
Externally publishedYes

Abstract

In the present study, the authors used a supply of naturally contaminated oysters to investigate how the subcellular metal distribution and the metal burden in prey affected the transfer of metals to a marine fish, the grunt Terapon jarbua. The oysters, Crassostrea hongkongensis, each with different contamination histories, were collected and separated into 3 subcellular fractions: 1) metal-rich granules, 2) cellular debris, and 3) a combined fraction of organelles, heat-denatured proteins, and metallothionein-like proteins, defined as the trophically available metal (TAM). These purified fractions showed a wide range of metal concentrations and were fed to the fish for a period of 7 d at a daily comparable feeding rate of 3% of fish body weight. After 7 d exposure, the newly absorbed metals were mainly distributed in the intestine and liver, indicating a significant tissue-specific trophic transfer, especially for Cd and Cu. The trophic transfer factors (TTFs) showed a sequence of cellular debris >TAM>metal-rich granules, suggesting the impact of subcellular distribution in prey on metal bioavailability. However, significant inverse relationships between the TTFs and the metal concentrations in diets were also found in the present study, especially for Cd and Zn. The subcellular metal compartmentalization might be less important than the metal concentration in prey influencing the trophic transfer. The authors' results have important implications for bioavailability and environmental assessment of dietary metals. © 2013 SETAC.

Research Area(s)

  • Contaminated prey, Metals, Subcellular fractions, Trophic transfer