Winter mortality of freshwater fish associated with parasitic infection

This study reports an episode of fish mortality occurred in the Garupá and Pindapoy Grande streams, near the confluence with the Paraná River (Garupá, Argentina). Dead and moribund fish of various species were observed floating on the water surface. Environmental parameters measured were temperature...

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Detalles Bibliográficos
Autores principales: Hernández, D. R., Aichino, D. R., Santinón, J. J., Ruiz Díaz, F. J., Aguilera, J. N., Roux, J. P., Sánchez, S.
Formato: Artículo revista
Lenguaje:Inglés
Publicado: Universidad Nacional del Nordeste 2024
Materias:
wild environments
fishes
parasites
Chilodonella
histopathological analysis
ambientes naturales
peces
parásitos
análisis histopatológico
Acceso en línea:https://revistas.unne.edu.ar/index.php/vet/article/view/7475
Aporte de:
Revistas UNNE - Universidad Nacional del Noroeste (UNNE) de Universidad Nacional del Nordeste
id I48-R154-article-7475
record_format ojs
spelling I48-R154-article-74752024-05-15T00:22:45Z Winter mortality of freshwater fish associated with parasitic infection Mortalidad invernal de peces de agua dulce asociada a infección parasitaria Hernández, D. R. Aichino, D. R. Santinón, J. J. Ruiz Díaz, F. J. Aguilera, J. N. Roux, J. P. Sánchez, S. wild environments fishes parasites Chilodonella histopathological analysis ambientes naturales peces parásitos Chilodonella análisis histopatológico This study reports an episode of fish mortality occurred in the Garupá and Pindapoy Grande streams, near the confluence with the Paraná River (Garupá, Argentina). Dead and moribund fish of various species were observed floating on the water surface. Environmental parameters measured were temperature 5 °C, water temperature 15.1 (±0.6) °C, dissolved oxygen 8.7 (±1.2) ppm, pH 7.5 (±0.2), electrical conductivity 67.6 (± 8.8) mS cm-1 and mean depth of 1.7 (±1.0) m. Macroscopic examination of moribund fish revealed corneal opacity, whitish tegument, increased gill mucus, and whitish areas on gill filaments. Microscopic analysis of gills revealed severe generalized epithelial hyperplasia, lamellar fusion, congestion, and inflammatory infiltrate, particularly lymphocytes and eosinophilic granular cells. In addition, microscopic examination allowed the identification of the following ectoparasites found in gills and tegument: Chilodonella, Ichthyophthirius, Dactylogyridae and Trichodinidae, representing 98%, 1.2%, 0.6% and 0.2%, respectively. This study constitutes a novel record of wild fish mortality associated with extreme environmental conditions and parasitosis. Furthermore, our findings are significant as there are no prior reports in Argentina of epizootic cases linked to Chilodonella sp. infection in wild or farmed fish populations, being the first report of chilodonelliasis for this region. Este estudio reporta un episodio de mortandad de peces ocurrido en los arroyos Garupá y Pindapoy Grande, cerca de la confluencia con el río Paraná (Garupá, Argentina). En este tramo se encontraron flotando en la superficie del agua, peces moribundos y muertos de diferentes especies. Los parámetros medidos fueron: temperatura ambiental 5 °C, temperatura del agua 15,1 (±0,6) °C, oxígeno disuelto 8,7 (±1,2) ppm, pH 7,5 (±0,2), conductividad 67,6 (± 8,8) mS cm-1 y profundidad media de 1,7 (±1,0) m. En el examen macroscópico de peces moribundos se observó opacidad corneal, tegumento blanquecino, aumento de moco branquial y áreas blanquecinas en los filamentos branquiales. El análisis microscópico de las branquias reveló hiperplasia epitelial generalizada grave, fusión laminar, congestión e infiltrado inflamatorio, particularmente linfocitos y células granulares eosinófilas. Además, el examen microscópico permitió identificar los siguientes ectoparásitos encontrados en piel y branquias: Chilodonella, Ichthyophthirius, Dactylogyridae y Trichodinidae, que representó el 98%; 1,2%; 0,6% y 0,2%, respectivamente. El presente estudio es un nuevo registro de mortandad de peces silvestres relacionada con condiciones ambientales extremas y parasitosis. Además, nuestro hallazgo aporta información valiosa, ya que en Argentina no existen registros de casos epizoóticos asociados a infección por Chilodonella sp. en poblaciones de peces silvestres o de criaderos, siendo el primer reporte de quilodonelliasis para esta región. Universidad Nacional del Nordeste 2024-05-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.unne.edu.ar/index.php/vet/article/view/7475 10.30972/vet.3517475 Revista Veterinaria; Vol. 35 Núm. 1 (2024); 22-28 1669-6840 1668-4834 eng https://revistas.unne.edu.ar/index.php/vet/article/view/7475/6907 https://creativecommons.org/licenses/by-nc/4.0
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-154
container_title_str Revistas UNNE - Universidad Nacional del Noroeste (UNNE)
language Inglés
format Artículo revista
topic wild environments
fishes
parasites
Chilodonella
histopathological analysis
ambientes naturales
peces
parásitos
Chilodonella
análisis histopatológico
spellingShingle wild environments
fishes
parasites
Chilodonella
histopathological analysis
ambientes naturales
peces
parásitos
Chilodonella
análisis histopatológico
Hernández, D. R.
Aichino, D. R.
Santinón, J. J.
Ruiz Díaz, F. J.
Aguilera, J. N.
Roux, J. P.
Sánchez, S.
Winter mortality of freshwater fish associated with parasitic infection
topic_facet wild environments
fishes
parasites
Chilodonella
histopathological analysis
ambientes naturales
peces
parásitos
Chilodonella
análisis histopatológico
author Hernández, D. R.
Aichino, D. R.
Santinón, J. J.
Ruiz Díaz, F. J.
Aguilera, J. N.
Roux, J. P.
Sánchez, S.
author_facet Hernández, D. R.
Aichino, D. R.
Santinón, J. J.
Ruiz Díaz, F. J.
Aguilera, J. N.
Roux, J. P.
Sánchez, S.
author_sort Hernández, D. R.
title Winter mortality of freshwater fish associated with parasitic infection
title_short Winter mortality of freshwater fish associated with parasitic infection
title_full Winter mortality of freshwater fish associated with parasitic infection
title_fullStr Winter mortality of freshwater fish associated with parasitic infection
title_full_unstemmed Winter mortality of freshwater fish associated with parasitic infection
title_sort winter mortality of freshwater fish associated with parasitic infection
description This study reports an episode of fish mortality occurred in the Garupá and Pindapoy Grande streams, near the confluence with the Paraná River (Garupá, Argentina). Dead and moribund fish of various species were observed floating on the water surface. Environmental parameters measured were temperature 5 °C, water temperature 15.1 (±0.6) °C, dissolved oxygen 8.7 (±1.2) ppm, pH 7.5 (±0.2), electrical conductivity 67.6 (± 8.8) mS cm-1 and mean depth of 1.7 (±1.0) m. Macroscopic examination of moribund fish revealed corneal opacity, whitish tegument, increased gill mucus, and whitish areas on gill filaments. Microscopic analysis of gills revealed severe generalized epithelial hyperplasia, lamellar fusion, congestion, and inflammatory infiltrate, particularly lymphocytes and eosinophilic granular cells. In addition, microscopic examination allowed the identification of the following ectoparasites found in gills and tegument: Chilodonella, Ichthyophthirius, Dactylogyridae and Trichodinidae, representing 98%, 1.2%, 0.6% and 0.2%, respectively. This study constitutes a novel record of wild fish mortality associated with extreme environmental conditions and parasitosis. Furthermore, our findings are significant as there are no prior reports in Argentina of epizootic cases linked to Chilodonella sp. infection in wild or farmed fish populations, being the first report of chilodonelliasis for this region.
publisher Universidad Nacional del Nordeste
publishDate 2024
url https://revistas.unne.edu.ar/index.php/vet/article/view/7475
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first_indexed 2024-08-21T22:35:56Z
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