Estimation of mercury uptake efficiency and the development of feed input models for the evaluation of baitfish regimes in determining mercury concentration of farmed southern bluefin tuna (Thunnus maccoyii) |
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| Authors: | S Balshaw D Ellis B Daughtry |
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| Institution: | 1. Laboratório de Química Orgânica Marinha, Instituto Oceanográfico, Universidade de São Paulo, 05508-120 São Paulo, SP, Brazil;2. Littoral Environnement et Sociétés (LIENSs), UMR 7266, CNRS-Université de La Rochelle, 2 rue Olympe de Gouges, 17042 La Rochelle Cedex 01, France;1. College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, 905 N Koyukuk Dr, Fairbanks, AK 99775-7220, USA;2. University of Alaska Museum of the North, University of Alaska, Fairbanks, 907 Yukon Dr, Fairbanks, AK 99775-6960, USA;3. Water and Environmental Research Center, 306 Tanana Loop, Fairbanks, AK 99775-5860, USA;4. Alaska Stable Isotope Facility, University of Alaska, Fairbanks, 907 Yukon Dr, Fairbanks, AK 99775-6960, USA;5. Ocean Peace, Inc., 4201 21st Avenue West, Seattle, WA 98199, USA;6. NOAA National Marine Fisheries Service, Alaska Fisheries Science Center, 7600 Sandpoint Way, NE (F/AKC2), Seattle, WA 98115, USA;7. Department of Veterinary Medicine, University of Alaska Fairbanks, 901 Koyukuk Drive, Fairbanks, AK 99775-7750, USA;1. Laboratory of Ichthyology, Institute of Oceanography, Federal University of Rio Grande, Av. Itália Km 8, Carreiros, 96, 201-900, Rio Grande, RS, Brazil;2. Department of Biological Sciences and the Advanced Environmental Research Institute, University of North Texas, 1155 Union Circle #310559, Denton, TX 76203-5017, USA;1. Marine Ecology Department, National Marine Environmental Monitoring Center, Dalian 116023, China;2. College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China;3. School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | A model is presented for the prediction of mercury (Hg) concentrations in the edible tissues of farmed southern bluefin tuna, Thunnus maccoyii (SBT) during commercial culture. The predictive model was developed using the initial Hg concentration of wild-caught SBT (mg kg? 1), Hg concentration of feed (mg kg? 1), SBT feeding rate (kg kg? 1 day? 1), SBT tissue growth rate (kg day? 1) and least squares minimisation estimation of Hg uptake efficiency, η. Model development and validation was based on experimental data collected from commercially cultured SBT which are farmed in in-sea pontoons (sea-pontoons). Model predictions indicate that over a typical farming season SBT from each of three commercially operated sea-pontoons experienced a 0.1 mg kg? 1, 0.14 mg kg? 1 and > 0.2 mg kg? 1 reduction in the Hg concentration of muscular tissues respectively. This is the first study to attempt to estimate Hg uptake efficiency in a tuna species. Estimation of Hg uptake efficiency and development of a working model for prediction of Hg concentration in SBT under varying culture diets, represent the first steps towards taking the guesswork out of managing Hg residues in cultured tuna. |
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