Lipid and fatty acid composition, and persistent organic pollutant levels in tissues of migrating Atlantic bluefin tuna (Thunnus thynnus, L.) broodstock

Citation

Sprague M, Dick JR, Medina A, Tocher DR, Bell JG & Mourente G (2012) Lipid and fatty acid composition, and persistent organic pollutant levels in tissues of migrating Atlantic bluefin tuna (Thunnus thynnus, L.) broodstock. Environmental Pollution, 171, pp. 61-71. https://doi.org/10.1016/j.envpol.2012.07.021

Abstract
Lipid class, fatty acid and POP levels were measured in migrating Atlantic bluefin tuna (ABT) tissues caught off the Barbate coast, Spain. Tissue lipids were largely characterized by triacylglycerol, reflecting large energy reserves accumulated prior to reproductive migration. Fatty acid compositions of muscle, liver and adipose exhibited similar profiles, whereas gonads showed a higher affinity for docosahex- aenoic acid. Tissue POP concentrations correlated positively with percentage triacylglycerol and nega- tively with polar lipids. Highest POP concentrations were in adipose and lowest in gonads, reflecting lipid content. DL-PCBs contributed most to total PCDD/F þ DL-PCB levels, with mono-ortho concentrations higher in tissues, whereas non-ortho PCBs contributed greater WHO-TEQs due to differences in TEFs. PBDE47 was the most prominent BDE congener in tissues, probably through biotransformation of BDE99 and other higher brominated congeners. The perceived POP risk from ABT consumption should be balanced by the well-established beneficial effects on human health of omega-3 fatty acids.

Keywords
Atlantic bluefin tuna; Thunnus thynnus; Persistent organic pollutants (POPs); PCDD/Fs; DL-PCBs; PBDEs; Lipids; Fatty acids.

Journal
Environmental Pollution: Volume 171

People

Professor Gordon Bell

Emeritus Professor, Institute of Aquaculture

Mr James Dick

Technical Manager

Dr Matthew Sprague

Lecturer in Nutrition, Institute of Aquaculture