Data/hora: 16/06/2024 08:14:45

Biblioteca(s): | Epagri-Sede.
Data corrente: | 16/08/2019
Data da última atualização: | 16/08/2019
Autoria: | FURTADO, W. E.; CARDOSO, L.; FIGUEREDO, A. B.; MARCHIORI, N. C.; MARTINS, M. L.
Título: | Histological and hematological alterations of silver catfish Rhamdia quelen highly parasitized by Lernaea cyprinacea.
Ano de publicação: | 2019
Fonte/Imprenta: | Diseases of Aquatic Organisms, Oldendorf, v. 135, n. 2, p. 157-168, 2019.
Idioma: | Inglês
Conteúdo: | The main objective of this study was to evaluate the histological and hematological alterations of silver catfish Rhamdia quelen (Quoy & Gaimard, 1824) against intense parasitism by anchor worm Lernaea cyprinacea Linnaeus, 1758. Thirteen fish specimens were collected at the Fish Genetic Improvement Unit (Epagri/Cedap), Brazil. After acclimatization, the fish were anesthetized for blood collection, and the samples were used for counting thrombocytes, total leukocytes, differential leukocytes and for quantification of total erythrocytes. Afterwards, the animals were euthanized, the parasites removed and quantified, and the portions of the affected tegument fixed in 10% buffered formalin. All the analyzed animals were parasitized by L. cyprinacea with mean intensity of 192 specimens per fish. The hematological profile of the animals was different that reported for healthy fish. Imature leukocytes were the most abundant cells, followed by monocytes, lymphocytes, neutrophils, and periodic acid Schiff-positive granular leukocytes. A small number of neutrophils were present in the bloodstream of parasitized fish, while histological examination evidenced the accumulation of this cell type near the place of infection by the parasite. Total leukocytes correlated significantly and positively (r = 0.6, p = 0.030) with the intensity of L. cyprinacea infection and the fish weight. Histological changes included hemorrhage, liquefactive necrosis and connective tissue disarrangement, necrosis, granulomatous inflammation, mononuclear and polynuclear inflammation, as well as hyperplasia and hypertrophy oh the alarm and mucous cells. The L. cyprinacea infection intensity caused deleterious changes both in the hematological profile and the integument of R. quelen, confirming the pathogenic potential of this parasite to the affected fish species.
Palavras-Chave: | Anchor worm; Catfish; Disease; Fish farm; Hematology; Histopathology.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_42936.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (103649-1) - UPC - AP - DD -  -  -  - DIS