Differential micropollutants bioaccumulation in European hake and their parasites Anisakis sp.

Abstract

Organisms are exposed to various stressors including parasites and micropollutants. Their combined effects are hard to predict. This study assessed the trophic relationship, micropollutants bioaccumulation and infection degree in a host-parasite couple. Carbon and nitrogen isotopic ratios were determined in hake Merluccius merluccius muscle and in its parasite Anisakis sp.. Concentrations of both priority (mercury species and polychlorinated biphenyls congeners) and emerging (musks and sunscreens) micropollutants were also measured for the parasite and its host, to detect potential transfer of contaminants between the two species. The results showed partial trophic interaction between the parasite and its host, in accordance with the Anisakis sp. life encysted in hake viscera cavity. PCB transfer between the two species may result from some lipids uptake by the parasite, while no relation occurred for the two other contaminants. Finally, a positive correlation was found between the number of Anisakis sp. larvae and the methylmercury contamination for hake, emphasizing the assumption that the contamination level in methylmercury can weaken immune system of the host enough to affect parasite infection degree.Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site.

Distribution of mercury species in different tissues and trophic levels of commonly consumed fish species from the south Bay of Biscay (France)

“…Muscle stable isotopic ratios were measured with a Thermo Scientific® Delta V Advantage mass spectrometer coupled to a Thermo Scientific® Flash EA1112 elemental analyzer following routine protocol of the Plateforme Spectrometrie Ocean (https://www-iuem.univ-brest.fr/delta-v-plus-eagb/?lang=en) and used in previously published paper (e.g. Mille et al, 2020;Timmerman et al, 2020).…”

Benefits of Parasitism in Polluted Environments: A Review and Perspectives

“…Dogs with heartworm disease (Dirofilaria immitis, a nematode feeding directly on the host's blood) also exhibited lower serum levels of PCBs, OCPs, and PAH compared with non-infected dogs (Henríquez-Hernández et al, 2016). Similar findings were found for PCBs, but not for musk fragrances (Mille et al, 2020).…”

“…Similar findings have been reported for organic pollutants (mainly persistent ones), but studies remain scarce because of analytical challenges in providing accurate methods to quantify chemical analytes, such as their metabolites, from a limited amount of biological samples. For instance, polychlorobiphenyls (PCBs) levels were significantly higher in acanthocephalans than in perch (Brázová et al, 2012), in intestinal cestodes, Caryophyllaeus laticeps, than in their host (bream, Abramis brama, Brázová et al, 2021), and in the intestinal nematode, Anisakis sp., than in European hake (Mille et al, 2020). This bioaccumulation was observed for organochlorine pesticides (OCPs), polybrominated diphenyl ethers, phthalates, and polycyclic aromatic hydrocarbons (PAHs) in acanthocephalans compared with the muscle of their chub host but not for pyrethroid insecticides (Molbert et al, 2020) or musk fragrances (Mille et al, 2020).…”

“…For instance, polychlorobiphenyls (PCBs) levels were significantly higher in acanthocephalans than in perch (Brázová et al, 2012), in intestinal cestodes, Caryophyllaeus laticeps, than in their host (bream, Abramis brama, Brázová et al, 2021), and in the intestinal nematode, Anisakis sp., than in European hake (Mille et al, 2020). This bioaccumulation was observed for organochlorine pesticides (OCPs), polybrominated diphenyl ethers, phthalates, and polycyclic aromatic hydrocarbons (PAHs) in acanthocephalans compared with the muscle of their chub host but not for pyrethroid insecticides (Molbert et al, 2020) or musk fragrances (Mille et al, 2020). Hence, the levels of a wide variety of toxic chemicals, with some exceptions, are higher in intestinal parasites than in their host.…”

A fish-parasite sentinel system in an assessment of the spatial distribution of polychlorinated biphenyls

“…In the present study, no significant differences in parasite abundance were found, although female catfish harboured a greater number of G. osculata cestodes than males. Mille et al 46 showed that larger male hake harboured a greater number of endoparasites than smaller females. They explained that this difference could be caused by sexual dimorphism in fish size.…”