Effects of dietary methylmercury on liver and kidney histology in the neotropical fish Hoplias malabaricus (2006)
- Autores:
- Autor USP: VENTURA, DORA SELMA FIX - IP
- Unidade: IP
- DOI: 10.1016/j.ecoenv.2006.11.013
- Assuntos: PSICOLOGIA EXPERIMENTAL; PEIXES TROPICAIS; MORFOLOGIA ANIMAL
- Idioma: Inglês
- Resumo: Methylmercury is a potent toxic present in Amazonian fish species due to gold mining activities. In the present work, we investigated the morphological effects of methylmercury in liver and kidney of Hoplias malabaricus feeding contaminated prey fish over 70 days. Two groups of nine mature fish (tested and control) were acclimatized for four weeks to laboratory conditions and then the tested group fed prey fish previously contaminated at an additional level of 0.075 µg MeHg g-1 at 5-day intervals and over 14 successive intervals whereas control group fed uncontaminated fish. H. malabaricus specimens were then dissected for chemical and morphological analyses. The low and realistic level of MeHg in the prey fish induced a low increase of total mercury in liver (1.8-fold) and muscle (2.2-fold). The biomagnification factor (Hg in predator/Hg in prey) reached 142 in liver and 21 in muscle and was indicative of a relatively fast contamination of internal organs by dietary exposure. The liver of exposed individuals presented leukocyte infiltration, increased number of melano-macrophage centers, necrotic areas and lesions in Disse's space. Evident disorder and chaos in cytoskeleton organization suggest a strong toxic effect in hepatocytes, such as organelles positioning and movement, vesicles traffic and secretion. Head kidney showed large necrosis areas, increased number of melano-macrophages centers, phagocytic areas, intercellular space among parenquimal cellsand atypical cells. Injuries and damages to tissues suggest too slow defense mechanisms to immobilize or eliminate ingested methylmercury, demonstrating that the sensitivity of fish cells to methylmercury exposure is higher than it has been previously described in the literature
- Fonte:
- Título: Ecotoxicology and Environmental Safety
- Volume/Número/Paginação/Ano: on-line, 2006
- Este periódico é de assinatura
- Este artigo NÃO é de acesso aberto
- Cor do Acesso Aberto: closed
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ABNT
MELA, M et al. Effects of dietary methylmercury on liver and kidney histology in the neotropical fish Hoplias malabaricus. Ecotoxicology and Environmental Safety, 2006Tradução . . Disponível em: https://doi.org/10.1016/j.ecoenv.2006.11.013. Acesso em: 02 out. 2024. -
APA
Mela, M., Randi, M. A. F., Carvalho, E. P., & Ribeiro, C. A. O. (2006). Effects of dietary methylmercury on liver and kidney histology in the neotropical fish Hoplias malabaricus. Ecotoxicology and Environmental Safety. doi:10.1016/j.ecoenv.2006.11.013 -
NLM
Mela M, Randi MAF, Carvalho EP, Ribeiro CAO. Effects of dietary methylmercury on liver and kidney histology in the neotropical fish Hoplias malabaricus [Internet]. Ecotoxicology and Environmental Safety. 2006 ;[citado 2024 out. 02 ] Available from: https://doi.org/10.1016/j.ecoenv.2006.11.013 -
Vancouver
Mela M, Randi MAF, Carvalho EP, Ribeiro CAO. Effects of dietary methylmercury on liver and kidney histology in the neotropical fish Hoplias malabaricus [Internet]. Ecotoxicology and Environmental Safety. 2006 ;[citado 2024 out. 02 ] Available from: https://doi.org/10.1016/j.ecoenv.2006.11.013 - Effects of fixed cutoff filtering on dark- and light-adapted ERG components and the application of variable cutoff filter
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Informações sobre o DOI: 10.1016/j.ecoenv.2006.11.013 (Fonte: oaDOI API)
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