Benefit-risk associated with the consumption of fish bycatch from tropical tuna fisheries

Type Article
Date 2020-12
Language English
Author(s) Sardenne Fany1, Bodin Nathalie2, 3, 4, Médieu Anais1, 3, Antha Marisa2, Arrisol Rona2, Le Grand Fabienne1, Bideau Antoine1, Munaron Jean-Marie1, Le Loc’h François1, Chassot Emmanuel2, 3
Affiliation(s) 1 : Univ Brest, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzané, France
2 : Seychelles Fishing Authority (SFA), Fishing Port, Victoria, Mahé, Seychelles
3 : Institute for Research and Sustainable Development (IRD), Fishing Port, Victoria, Mahé, Seychelles
4 : Sustainable Ocean Seychelles (SOS), BeauBelle, Mahé, Seychelles
Source Environmental Pollution (0269-7491) (Elsevier BV), 2020-12 , Vol. 267 , P. 115614 (12p.)
DOI 10.1016/j.envpol.2020.115614
WOS© Times Cited 10
Keyword(s) Contaminant, Polyunsaturated fatty acids, Hazard quotient, Pelagic fish, Western Indian ocean

Mercury, omega-3 (docosahexaenoic acid, DHA and eicosapentaenoic acid, EPA) and macronutrients (fat and proteins) were quantified on a wet weight (ww) basis in 20 species of fish taken as bycatch in tropical tuna fisheries. Based on a hazard quotient taking into account mercury and omega-3 contents, a benefit-risk assessment for the consumption of these pelagic species was conducted for three people categories: young children, children and adults. All fish bycatch were found to be an excellent source of proteins (min‒max = 14.4‒25.2 g/100g fillet), had low omega-6/omega-3 ratios (<1, except for silky shark), and had mercury content below the safety limits defined by sanitary agencies. Silky shark and Istiophoridae had the highest mercury contents (min‒max = 0.029‒0.317 ppm ww). Omega-3 contents were the lowest in silky shark (0.2±0.2 mg/100g fillet) and the highest in striped marlin (3.6±3.2 g/100g fillet). Billfishes (Istiophoridae, including striped marlin), minor tunas (Scombridae), and Carangidae had the highest omega-3 contents (min‒max = 0.68‒7.28 g/100g fillet). The highest hazard quotient values obtained for silky shark and great barracuda reflected a lower nutritional benefit (i.e., low omega-3 source) than risk (i.e., mercury exposure), making them not advisable for consumption. Eight species had low hazard quotients, and among them cottonmouth jack and flat needlefish were found of high health interest (high protein, moderate fat contents, and low omega-6/omega-3 ratio). A daily serving portion of 85‒200 g (according to people category) can be recommended for these species. Batfish, and to a lower extent pompano dolphinfish and brassy chub, can also be consumed safely and would provide greater health benefits than risks. These results advocate for a better access of these species to local populations.

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Sardenne Fany, Bodin Nathalie, Médieu Anais, Antha Marisa, Arrisol Rona, Le Grand Fabienne, Bideau Antoine, Munaron Jean-Marie, Le Loc’h François, Chassot Emmanuel (2020). Benefit-risk associated with the consumption of fish bycatch from tropical tuna fisheries. Environmental Pollution, 267, 115614 (12p.). Publisher's official version : , Open Access version :