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Bibliographie de l'Institut Maurice-Lamontagne

Poissons / Morone saxatilis / Bar d'Amérique, Bar rayé

VALDEZ DOMINGOS, F.X., C.A. OLIVEIRA RIBEIRO, É PELLETIER, C. ROULEAU, 2011. Tissue distribution and depuration kinetics of waterborne 14C-labeled light PAHs in mummichog (Fundulus heteroclitus). Environ. Sci. Technol., 45(7): 2684-2690.

[Résumé disponible seulement en anglais]
Light polycyclic aromatic hydrocarbons (PAHs) of petrogenic origin are commonly found in estuaries and coastal areas. Though they are known to be toxic to fish, little is known about their uptake and tissue distribution. This paper reports on the results of a study on uptake, elimination, and tissue distribution of three waterborne 14C-labeled PAHs in the mummichog, Fundulus heteroclitus, using whole-body autoradiography. After a 24 h exposure to 1 μCi•3 L–1 of 14C-naphthalene, 14C-1-naphthol, and 14C-phenanthrene, fish were transferred to clean water and tissue distribution examined after 0, 1, 3, 7, 14, and 21 days of depuration. All compounds were readily accumulated by fish and were also rapidly eliminated (t0.5 range = 1.1 to 3.0 days). Most of the radioactivity in naphthalene- and phenanthrene-treated fish was found in gall bladder >> liver > intestinal lumen. In naphthol-exposed fish, an important labeling of some brain areas was observed. Brain of naphthalene-exposed fish was also labeled after 24 h depuration, indicating that exposure to naphthalene may result in metabolite accumulation in the brain. This is the first study showing that naphthalene, naphthol, and/or unidentified metabolite(s) can accumulate in brain tissues, which may impair normal brain function.©2011 American Chemical Society

SÉGUIN, G., F. BOUCHARD, L.N. MEASURES, C.F. UHLAND, S. LAIR, 2011. Infections with Philometra sp. Associated with mortalities in wild-hatched captive-raised striped bass, Morone saxatilis (Walbaum). J. Fish Dis., 34(6): 475-481.

[Résumé disponible seulement en anglais]
The striped bass, Morone saxatilis (Walbaum), once represented an important resource for fisheries in the St Lawrence River (Quebec, Canada). A restoration programme, involving captive propagation, was implemented with the objective of restocking the population, which had disappeared in the late 1960s. An unusually high rate of mortality was observed during the winter of 2006 in captive-raised fingerlings that were originally collected from the Miramichi River (New Brunswick, Canada) the previous summer. Post-mortem examinations revealed extensive granulomatous and hyperplastic peritonitis associated with numerous nematodes of the genus Philometra. Given the severity of the lesions, high intensity of infection by Philometra sp. Was presumed to be the primary factor in the unusual mortalities reported that winter. Observations suggest that this nematode, which was acquired in the wild, cannot establish itself in a captive environment, most likely because of the absence of the obligate intermediate host. Examination of archived specimens of striped bass showed that this parasite was probably present in the St Lawrence River population prior to its extirpation. Consequently, the introduction of infected fish into this ecosystem should not be a concern. Nevertheless, infectionrelated mortalities of fingerlings might affect dynamics of wild striped bass populations.

DFO, 2009. Potential impact of accidental captures by commercial and recreational fisheries on the survival and recovery of the striped bass (Morone saxatilis) population in the St. Lawrence Estuary. Science response (Canadian Science Advisory Secretariat), 2009/018, 25 p.

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MPO, 2009. Impact possible des captures accidentelles par les pêches commerciales et sportives sur la survie et le rétablissement de la population de bar rayé (Morone saxatilis) de l'estuaire du Saint-Laurent. Réponse des sciences (Secrétariat canadien de consultation scientifique), 2009/018, 25 p .

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