Posibles causas de una mortandad de pejerrey, Odontesthes bonariensis, en la Laguna del Monte

Autores
Freyre, Lauce Rubén; Maroñas, Miriam E.; Sendra, Eduardo Daniel; Cornejo, Alejandra
Año de publicación
2005
Idioma
español castellano
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Between the 18 and 20 of April of 1998 a silvers side fish kill was observed in Monte urban shallow lake. Rains preceded the phenomenon without being observed lake water level variations, but iridescence in the surface was noticed. Sampled dead fish were obtained for measurement and autopsies were carried out as well. The size range was between 90 and 180 mm of standard length. The fish measurements were made in 21 specimens with best conservation condition and results concerning cephalic index and condition factor were compared with those obtained in previous years. Since most presented high degree of decomposition it was only possible to dissect the gills. Microscopic images of these didn’t record the presence infectious agents so it was discarded as a possible cause. The somatic relationships and indexes show that these fish have suffered growth difficulties which, coupled with the analysis of the gills, supports the hypothesis of an environmental alteration as responsible for the fish kill. Variation leading to an increment in the concentration of organic matter (MO) in the lake produced by the rain induced transport of MO accumulated in the basin of the tributary (channeled), possibly further potentates by the incorporation of hydrocarbons, given the observed iridescence. But this cannot be confirmed by lack of water sample. The made interpretations don’t allow to deduce the cause of the fish kill but enable to point out that the environmental phenomenon that provoked it possibly had not lead to the recorded consequences if the population had been less susceptible, more like under the conditions of previous years.
Materia
Zoología, Ornitología, Entomología, Etología
ictiología
mortandad de peces
Estado de Salud
pejerrey
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
CIC Digital (CICBA)
Institución
Comisión de Investigaciones Científicas de la Provincia de Buenos Aires
OAI Identificador
oai:digital.cic.gba.gob.ar:11746/2198

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repository_id_str 9441
network_name_str CIC Digital (CICBA)
spelling Posibles causas de una mortandad de pejerrey, Odontesthes bonariensis, en la Laguna del MonteFreyre, Lauce RubénMaroñas, Miriam E.Sendra, Eduardo DanielCornejo, AlejandraZoología, Ornitología, Entomología, Etologíaictiologíamortandad de pecesEstado de SaludpejerreyBetween the 18 and 20 of April of 1998 a silvers side fish kill was observed in Monte urban shallow lake. Rains preceded the phenomenon without being observed lake water level variations, but iridescence in the surface was noticed. Sampled dead fish were obtained for measurement and autopsies were carried out as well. The size range was between 90 and 180 mm of standard length. The fish measurements were made in 21 specimens with best conservation condition and results concerning cephalic index and condition factor were compared with those obtained in previous years. Since most presented high degree of decomposition it was only possible to dissect the gills. Microscopic images of these didn’t record the presence infectious agents so it was discarded as a possible cause. The somatic relationships and indexes show that these fish have suffered growth difficulties which, coupled with the analysis of the gills, supports the hypothesis of an environmental alteration as responsible for the fish kill. Variation leading to an increment in the concentration of organic matter (MO) in the lake produced by the rain induced transport of MO accumulated in the basin of the tributary (channeled), possibly further potentates by the incorporation of hydrocarbons, given the observed iridescence. But this cannot be confirmed by lack of water sample. The made interpretations don’t allow to deduce the cause of the fish kill but enable to point out that the environmental phenomenon that provoked it possibly had not lead to the recorded consequences if the population had been less susceptible, more like under the conditions of previous years.Instituto de Limnología "Raúl A. Ringuelet" (ILPLA)2005info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttps://digital.cic.gba.gob.ar/handle/11746/2198spainfo:eu-repo/semantics/altIdentifier/issn/0326-1638info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/reponame:CIC Digital (CICBA)instname:Comisión de Investigaciones Científicas de la Provincia de Buenos Airesinstacron:CICBA2025-09-04T09:43:25Zoai:digital.cic.gba.gob.ar:11746/2198Institucionalhttp://digital.cic.gba.gob.arOrganismo científico-tecnológicoNo correspondehttp://digital.cic.gba.gob.ar/oai/snrdmarisa.degiusti@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:94412025-09-04 09:43:25.241CIC Digital (CICBA) - Comisión de Investigaciones Científicas de la Provincia de Buenos Airesfalse
dc.title.none.fl_str_mv Posibles causas de una mortandad de pejerrey, Odontesthes bonariensis, en la Laguna del Monte
title Posibles causas de una mortandad de pejerrey, Odontesthes bonariensis, en la Laguna del Monte
spellingShingle Posibles causas de una mortandad de pejerrey, Odontesthes bonariensis, en la Laguna del Monte
Freyre, Lauce Rubén
Zoología, Ornitología, Entomología, Etología
ictiología
mortandad de peces
Estado de Salud
pejerrey
title_short Posibles causas de una mortandad de pejerrey, Odontesthes bonariensis, en la Laguna del Monte
title_full Posibles causas de una mortandad de pejerrey, Odontesthes bonariensis, en la Laguna del Monte
title_fullStr Posibles causas de una mortandad de pejerrey, Odontesthes bonariensis, en la Laguna del Monte
title_full_unstemmed Posibles causas de una mortandad de pejerrey, Odontesthes bonariensis, en la Laguna del Monte
title_sort Posibles causas de una mortandad de pejerrey, Odontesthes bonariensis, en la Laguna del Monte
dc.creator.none.fl_str_mv Freyre, Lauce Rubén
Maroñas, Miriam E.
Sendra, Eduardo Daniel
Cornejo, Alejandra
author Freyre, Lauce Rubén
author_facet Freyre, Lauce Rubén
Maroñas, Miriam E.
Sendra, Eduardo Daniel
Cornejo, Alejandra
author_role author
author2 Maroñas, Miriam E.
Sendra, Eduardo Daniel
Cornejo, Alejandra
author2_role author
author
author
dc.subject.none.fl_str_mv Zoología, Ornitología, Entomología, Etología
ictiología
mortandad de peces
Estado de Salud
pejerrey
topic Zoología, Ornitología, Entomología, Etología
ictiología
mortandad de peces
Estado de Salud
pejerrey
dc.description.none.fl_txt_mv Between the 18 and 20 of April of 1998 a silvers side fish kill was observed in Monte urban shallow lake. Rains preceded the phenomenon without being observed lake water level variations, but iridescence in the surface was noticed. Sampled dead fish were obtained for measurement and autopsies were carried out as well. The size range was between 90 and 180 mm of standard length. The fish measurements were made in 21 specimens with best conservation condition and results concerning cephalic index and condition factor were compared with those obtained in previous years. Since most presented high degree of decomposition it was only possible to dissect the gills. Microscopic images of these didn’t record the presence infectious agents so it was discarded as a possible cause. The somatic relationships and indexes show that these fish have suffered growth difficulties which, coupled with the analysis of the gills, supports the hypothesis of an environmental alteration as responsible for the fish kill. Variation leading to an increment in the concentration of organic matter (MO) in the lake produced by the rain induced transport of MO accumulated in the basin of the tributary (channeled), possibly further potentates by the incorporation of hydrocarbons, given the observed iridescence. But this cannot be confirmed by lack of water sample. The made interpretations don’t allow to deduce the cause of the fish kill but enable to point out that the environmental phenomenon that provoked it possibly had not lead to the recorded consequences if the population had been less susceptible, more like under the conditions of previous years.
description Between the 18 and 20 of April of 1998 a silvers side fish kill was observed in Monte urban shallow lake. Rains preceded the phenomenon without being observed lake water level variations, but iridescence in the surface was noticed. Sampled dead fish were obtained for measurement and autopsies were carried out as well. The size range was between 90 and 180 mm of standard length. The fish measurements were made in 21 specimens with best conservation condition and results concerning cephalic index and condition factor were compared with those obtained in previous years. Since most presented high degree of decomposition it was only possible to dissect the gills. Microscopic images of these didn’t record the presence infectious agents so it was discarded as a possible cause. The somatic relationships and indexes show that these fish have suffered growth difficulties which, coupled with the analysis of the gills, supports the hypothesis of an environmental alteration as responsible for the fish kill. Variation leading to an increment in the concentration of organic matter (MO) in the lake produced by the rain induced transport of MO accumulated in the basin of the tributary (channeled), possibly further potentates by the incorporation of hydrocarbons, given the observed iridescence. But this cannot be confirmed by lack of water sample. The made interpretations don’t allow to deduce the cause of the fish kill but enable to point out that the environmental phenomenon that provoked it possibly had not lead to the recorded consequences if the population had been less susceptible, more like under the conditions of previous years.
publishDate 2005
dc.date.none.fl_str_mv 2005
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://digital.cic.gba.gob.ar/handle/11746/2198
url https://digital.cic.gba.gob.ar/handle/11746/2198
dc.language.none.fl_str_mv spa
language spa
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0326-1638
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Instituto de Limnología "Raúl A. Ringuelet" (ILPLA)
publisher.none.fl_str_mv Instituto de Limnología "Raúl A. Ringuelet" (ILPLA)
dc.source.none.fl_str_mv reponame:CIC Digital (CICBA)
instname:Comisión de Investigaciones Científicas de la Provincia de Buenos Aires
instacron:CICBA
reponame_str CIC Digital (CICBA)
collection CIC Digital (CICBA)
instname_str Comisión de Investigaciones Científicas de la Provincia de Buenos Aires
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institution CICBA
repository.name.fl_str_mv CIC Digital (CICBA) - Comisión de Investigaciones Científicas de la Provincia de Buenos Aires
repository.mail.fl_str_mv marisa.degiusti@sedici.unlp.edu.ar
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