Posibles causas de una mortandad de pejerrey, <i>Odontesthes bonariensis</i>, en la laguna de Monte

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 c...

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Autores principales: Freyre, Lauce Rubén, Maroñas, Miriam E., Sendra, Eduardo Daniel, Cornejo, A.
Formato: Articulo
Lenguaje:Español
Publicado: 2006
Materias:
Ciencias Naturales
Peces
fish kill, silverside, health condition
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/69432
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-69432
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Ciencias Naturales
Peces
fish kill, silverside, health condition
spellingShingle Ciencias Naturales
Peces
fish kill, silverside, health condition
Freyre, Lauce Rubén
Maroñas, Miriam E.
Sendra, Eduardo Daniel
Cornejo, A.
Posibles causas de una mortandad de pejerrey, <i>Odontesthes bonariensis</i>, en la laguna de Monte
topic_facet Ciencias Naturales
Peces
fish kill, silverside, health condition
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.
format Articulo
Articulo
author Freyre, Lauce Rubén
Maroñas, Miriam E.
Sendra, Eduardo Daniel
Cornejo, A.
author_facet Freyre, Lauce Rubén
Maroñas, Miriam E.
Sendra, Eduardo Daniel
Cornejo, A.
author_sort Freyre, Lauce Rubén
title Posibles causas de una mortandad de pejerrey, <i>Odontesthes bonariensis</i>, en la laguna de Monte
title_short Posibles causas de una mortandad de pejerrey, <i>Odontesthes bonariensis</i>, en la laguna de Monte
title_full Posibles causas de una mortandad de pejerrey, <i>Odontesthes bonariensis</i>, en la laguna de Monte
title_fullStr Posibles causas de una mortandad de pejerrey, <i>Odontesthes bonariensis</i>, en la laguna de Monte
title_full_unstemmed Posibles causas de una mortandad de pejerrey, <i>Odontesthes bonariensis</i>, en la laguna de Monte
title_sort posibles causas de una mortandad de pejerrey, <i>odontesthes bonariensis</i>, en la laguna de monte
publishDate 2006
url http://sedici.unlp.edu.ar/handle/10915/69432
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