Stress responses of the fish Nile tilapia subjected to electroshock and social stressors
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S0100-879X2006001200012 http://hdl.handle.net/11449/17772 |
Resumo: | Plasma cortisol and glucose levels were measured in 36 adult Nile tilapia males, Oreochromis niloticus (standard length, mean ± SD, 14.38 ± 1.31 cm), subjected to electroshock and social stressors. Pre-stressor levels were determined 5 days after the adjustment of the fish to the experimental aquaria (1 fish/aquarium). Five days later, the effects of stressors on both cortisol and glucose levels were assessed. The following stressors were imposed for 60 min: pairing with a larger resident animal (social stressor), or a gentle electroshock (AC, 20 V, 15 mA, 100 Hz for 1 min every 4 min). Each stressor was tested in two independent groups, one in which stress was quantified immediately after the end of the 60-min stressor imposition (T60) and the other in which stress was quantified 30 min later (T90). Pre-stressor values for cortisol and glucose were not statistically different between groups. Plasma cortisol levels increased significantly and were of similar magnitude for both electroshock and the social stressor (mean ± SD for basal and final samples were: electroshock T60 = 65.47 ± 15.3, 177.0 ± 30.3; T90 = 54.8 ± 16.0, 196.2 ± 57.8; social stress T60 = 47.1 ± 9.0, 187.6 ± 61.7; T90 = 41.6 ± 8.1, 112.3 ± 26.8, respectively). Plasma glucose levels increased significantly for electroshock at both time points (T60 and T90), but only at T90 for the social stressor. Initial and final mean (± SD) values are: electroshock T60 = 52.5 ± 9.2, 115.0 ± 15.7; T90 = 35.5 ± 1.1, 146.3 ± 13.3; social stress T60 = 54.8 ± 8.8, 84.4 ± 15.0; T90 = 34.5 ± 5.6, 116.3 ± 13.6, respectively. Therefore, electroshock induced an increase in glucose more rapidly than did the social stressor. Furthermore, a significant positive correlation between cortisol and glucose was detected only at T90 for the social stressor. These results indicate that a fish species responds differently to different stressors, thus suggesting specificity of fish stress response to a stressor. |
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Repositório Institucional da UNESP |
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Stress responses of the fish Nile tilapia subjected to electroshock and social stressorsStressAggressionAgonistic behaviorFightingSocial stressElectroshockPlasma cortisol and glucose levels were measured in 36 adult Nile tilapia males, Oreochromis niloticus (standard length, mean ± SD, 14.38 ± 1.31 cm), subjected to electroshock and social stressors. Pre-stressor levels were determined 5 days after the adjustment of the fish to the experimental aquaria (1 fish/aquarium). Five days later, the effects of stressors on both cortisol and glucose levels were assessed. The following stressors were imposed for 60 min: pairing with a larger resident animal (social stressor), or a gentle electroshock (AC, 20 V, 15 mA, 100 Hz for 1 min every 4 min). Each stressor was tested in two independent groups, one in which stress was quantified immediately after the end of the 60-min stressor imposition (T60) and the other in which stress was quantified 30 min later (T90). Pre-stressor values for cortisol and glucose were not statistically different between groups. Plasma cortisol levels increased significantly and were of similar magnitude for both electroshock and the social stressor (mean ± SD for basal and final samples were: electroshock T60 = 65.47 ± 15.3, 177.0 ± 30.3; T90 = 54.8 ± 16.0, 196.2 ± 57.8; social stress T60 = 47.1 ± 9.0, 187.6 ± 61.7; T90 = 41.6 ± 8.1, 112.3 ± 26.8, respectively). Plasma glucose levels increased significantly for electroshock at both time points (T60 and T90), but only at T90 for the social stressor. Initial and final mean (± SD) values are: electroshock T60 = 52.5 ± 9.2, 115.0 ± 15.7; T90 = 35.5 ± 1.1, 146.3 ± 13.3; social stress T60 = 54.8 ± 8.8, 84.4 ± 15.0; T90 = 34.5 ± 5.6, 116.3 ± 13.6, respectively. Therefore, electroshock induced an increase in glucose more rapidly than did the social stressor. Furthermore, a significant positive correlation between cortisol and glucose was detected only at T90 for the social stressor. These results indicate that a fish species responds differently to different stressors, thus suggesting specificity of fish stress response to a stressor.Universidade Estadual Paulista Instituto de Biociências Research Center on Animal Welfare (RECAW)Universidade Estadual Paulista Instituto de Biociências Research Center on Animal Welfare (RECAW)Associação Brasileira de Divulgação Científica (ABRADIC)Universidade Estadual Paulista (Unesp)Barreto, R.E. [UNESP]Volpato, Gilson Luiz [UNESP]2014-05-20T13:49:49Z2014-05-20T13:49:49Z2006-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1605-1612application/pdfhttp://dx.doi.org/10.1590/S0100-879X2006001200012Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 39, n. 12, p. 1605-1612, 2006.0100-879Xhttp://hdl.handle.net/11449/1777210.1590/S0100-879X2006001200012S0100-879X2006001200012S0100-879X2006001200012.pdf3363114201357959SciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBrazilian Journal of Medical and Biological Research1.492info:eu-repo/semantics/openAccess2024-01-18T06:29:45Zoai:repositorio.unesp.br:11449/17772Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:22:04.079983Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Stress responses of the fish Nile tilapia subjected to electroshock and social stressors |
title |
Stress responses of the fish Nile tilapia subjected to electroshock and social stressors |
spellingShingle |
Stress responses of the fish Nile tilapia subjected to electroshock and social stressors Barreto, R.E. [UNESP] Stress Aggression Agonistic behavior Fighting Social stress Electroshock |
title_short |
Stress responses of the fish Nile tilapia subjected to electroshock and social stressors |
title_full |
Stress responses of the fish Nile tilapia subjected to electroshock and social stressors |
title_fullStr |
Stress responses of the fish Nile tilapia subjected to electroshock and social stressors |
title_full_unstemmed |
Stress responses of the fish Nile tilapia subjected to electroshock and social stressors |
title_sort |
Stress responses of the fish Nile tilapia subjected to electroshock and social stressors |
author |
Barreto, R.E. [UNESP] |
author_facet |
Barreto, R.E. [UNESP] Volpato, Gilson Luiz [UNESP] |
author_role |
author |
author2 |
Volpato, Gilson Luiz [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Barreto, R.E. [UNESP] Volpato, Gilson Luiz [UNESP] |
dc.subject.por.fl_str_mv |
Stress Aggression Agonistic behavior Fighting Social stress Electroshock |
topic |
Stress Aggression Agonistic behavior Fighting Social stress Electroshock |
description |
Plasma cortisol and glucose levels were measured in 36 adult Nile tilapia males, Oreochromis niloticus (standard length, mean ± SD, 14.38 ± 1.31 cm), subjected to electroshock and social stressors. Pre-stressor levels were determined 5 days after the adjustment of the fish to the experimental aquaria (1 fish/aquarium). Five days later, the effects of stressors on both cortisol and glucose levels were assessed. The following stressors were imposed for 60 min: pairing with a larger resident animal (social stressor), or a gentle electroshock (AC, 20 V, 15 mA, 100 Hz for 1 min every 4 min). Each stressor was tested in two independent groups, one in which stress was quantified immediately after the end of the 60-min stressor imposition (T60) and the other in which stress was quantified 30 min later (T90). Pre-stressor values for cortisol and glucose were not statistically different between groups. Plasma cortisol levels increased significantly and were of similar magnitude for both electroshock and the social stressor (mean ± SD for basal and final samples were: electroshock T60 = 65.47 ± 15.3, 177.0 ± 30.3; T90 = 54.8 ± 16.0, 196.2 ± 57.8; social stress T60 = 47.1 ± 9.0, 187.6 ± 61.7; T90 = 41.6 ± 8.1, 112.3 ± 26.8, respectively). Plasma glucose levels increased significantly for electroshock at both time points (T60 and T90), but only at T90 for the social stressor. Initial and final mean (± SD) values are: electroshock T60 = 52.5 ± 9.2, 115.0 ± 15.7; T90 = 35.5 ± 1.1, 146.3 ± 13.3; social stress T60 = 54.8 ± 8.8, 84.4 ± 15.0; T90 = 34.5 ± 5.6, 116.3 ± 13.6, respectively. Therefore, electroshock induced an increase in glucose more rapidly than did the social stressor. Furthermore, a significant positive correlation between cortisol and glucose was detected only at T90 for the social stressor. These results indicate that a fish species responds differently to different stressors, thus suggesting specificity of fish stress response to a stressor. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-12-01 2014-05-20T13:49:49Z 2014-05-20T13:49:49Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1590/S0100-879X2006001200012 Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 39, n. 12, p. 1605-1612, 2006. 0100-879X http://hdl.handle.net/11449/17772 10.1590/S0100-879X2006001200012 S0100-879X2006001200012 S0100-879X2006001200012.pdf 3363114201357959 |
url |
http://dx.doi.org/10.1590/S0100-879X2006001200012 http://hdl.handle.net/11449/17772 |
identifier_str_mv |
Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 39, n. 12, p. 1605-1612, 2006. 0100-879X 10.1590/S0100-879X2006001200012 S0100-879X2006001200012 S0100-879X2006001200012.pdf 3363114201357959 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Brazilian Journal of Medical and Biological Research 1.492 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
1605-1612 application/pdf |
dc.publisher.none.fl_str_mv |
Associação Brasileira de Divulgação Científica (ABRADIC) |
publisher.none.fl_str_mv |
Associação Brasileira de Divulgação Científica (ABRADIC) |
dc.source.none.fl_str_mv |
SciELO reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129511575781376 |