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Empirical models to identify mechanisms driving reductions in tissue mercury concentration during culture of farmed bluefin tuna Thunnus maccoyii

journal contribution
posted on 2023-05-16, 23:15 authored by Balshaw, S, Edwards, JW, Ross, KE, Ellis, DC, Padula, D, Daughtry, BJ
Two empirical models are presented to elucidate the mechanisms driving reductions in the mercury concentration of southern bluefin tuna (SBT) during culture. Model 1 predicts temporal fluctuations in mercury concentration in response to growth dilution. Model 2 predicts the combined effects of growth dilution and linear mercury accumulation. Model 2 was found to be the more accurate model. Over a typical farming period of 136 days, growth dilution resulted in a reduction in mean mercury concentration of SBT edible tissues from 0.51 mg/kg down to 0.33 mg/kg. Extended culture beyond 136 days resulted in an increase in mercury concentration due to the combined effects of mercury accumulation and seasonal lipid depletion. Results indicate that under current industry practice, cultured SBT can be consumed twice as frequently as that of wild caught SBT while maintaining total dietary mercury intake below national recommendations. © 2008 Elsevier Ltd. All rights reserved.

History

Publication title

Marine Pollution Bulletin

Volume

56

Issue

12

Pagination

2009 - 2017

ISSN

0025-326X

Department/School

Institute for Marine and Antarctic Studies

Publisher

Pergamon-Elsevier Science Ltd

Place of publication

Oxford

Repository Status

  • Restricted

Socio-economic Objectives

Aquaculture tuna

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