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DC Field | Value | Language |
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dc.contributor.author | Barreto, R.E. | - |
dc.contributor.author | Volpato, Gilson Luiz | - |
dc.date.accessioned | 2014-05-20T13:49:49Z | - |
dc.date.available | 2014-05-20T13:49:49Z | - |
dc.date.issued | 2006-12-01 | - |
dc.identifier | http://dx.doi.org/10.1590/S0100-879X2006001200012 | - |
dc.identifier.citation | Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 39, n. 12, p. 1605-1612, 2006. | - |
dc.identifier.issn | 0100-879X | - |
dc.identifier.uri | http://hdl.handle.net/11449/17772 | - |
dc.description.abstract | 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. | en |
dc.format.extent | 1605-1612 | - |
dc.language.iso | eng | - |
dc.publisher | Associação Brasileira de Divulgação Científica (ABRADIC) | - |
dc.source | SciELO | - |
dc.subject | Stress | en |
dc.subject | Aggression | en |
dc.subject | Agonistic behavior | en |
dc.subject | Fighting | en |
dc.subject | Social stress | en |
dc.subject | Electroshock | en |
dc.title | Stress responses of the fish Nile tilapia subjected to electroshock and social stressors | en |
dc.type | outro | - |
dc.contributor.institution | Universidade Estadual Paulista (UNESP) | - |
dc.description.affiliation | Universidade Estadual Paulista Instituto de Biociências Research Center on Animal Welfare (RECAW) | - |
dc.description.affiliationUnesp | Universidade Estadual Paulista Instituto de Biociências Research Center on Animal Welfare (RECAW) | - |
dc.identifier.doi | 10.1590/S0100-879X2006001200012 | - |
dc.identifier.scielo | S0100-879X2006001200012 | - |
dc.rights.accessRights | Acesso aberto | - |
dc.identifier.file | S0100-879X2006001200012.pdf | - |
dc.relation.ispartof | Brazilian Journal of Medical and Biological Research | - |
Appears in Collections: | Artigos, TCCs, Teses e Dissertações da Unesp |
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