Stress responses of the fish Nile tilapia subjected to electroshock and social stressors

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorBarreto, R.E.-
Autor(es): dc.creatorVolpato, Gilson Luiz-
Data de aceite: dc.date.accessioned2021-03-10T17:10:28Z-
Data de disponibilização: dc.date.available2021-03-10T17:10:28Z-
Data de envio: dc.date.issued2014-05-20-
Data de envio: dc.date.issued2014-05-20-
Data de envio: dc.date.issued2006-12-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1590/S0100-879X2006001200012-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/17772-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/17772-
Descrição: dc.descriptionPlasma 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.-
Formato: dc.format1605-1612-
Idioma: dc.languageen-
Publicador: dc.publisherAssociação Brasileira de Divulgação Científica (ABRADIC)-
Relação: dc.relationBrazilian Journal of Medical and Biological Research-
Relação: dc.relation1.492-
Direitos: dc.rightsopenAccess-
Palavras-chave: dc.subjectStress-
Palavras-chave: dc.subjectAggression-
Palavras-chave: dc.subjectAgonistic behavior-
Palavras-chave: dc.subjectFighting-
Palavras-chave: dc.subjectSocial stress-
Palavras-chave: dc.subjectElectroshock-
Título: dc.titleStress responses of the fish Nile tilapia subjected to electroshock and social stressors-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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