| Full text | |
| Author(s): |
Almeida, Diana Meira
[1]
;
Petesse, Maria Letizia
[2]
;
Tachibana, Leonardo
[1]
;
Dias, Danielle de Carla
[2]
;
Moreira, Renata Guimaraes
[3]
;
Tavares Ranzani-Paiva, Maria Jose
[1]
Total Authors: 6
|
| Affiliation: | [1] APTA, SSA, Secretaria Agr & Abastecimento, Inst Pesca, Av Francisco Matarazzo 455, BR-05001900 Sao Paulo, SP - Brazil
[2] Inst Pesca, Av Francisco Matarazzo 455, BR-05001900 Sao Paulo, SP - Brazil
[3] Univ Sao Paulo, Inst Biosci, Dept Fisiol, Rua Matao, Trav 14, 101, Salas 220-219B, BR-05508090 Sao Paulo, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | BOLETIM DO INSTITUTO DE PESCA; v. 44, n. 4 2018. |
| Web of Science Citations: | 0 |
| Abstract | |
Stress is know as responsible for the decrease in immunity and reduced survival, growth, and reproductive capacity of animals. Besides, organisms respond to certain biological rhythms, such as circadian, to which animals naturally adjust. This study aimed to monitor the plasma (lactate and total protein), serum (cortisol and cholesterol) and whole blood (glucose) variables in tilapia in a 24 h cycle. A set of 49 aquariums with 5 individuals each were used. All of them, at the beginning of the experiment, were subjected to the same stress of capture and handling. The animals from the first aquaria were sampled after 15 min of stress. Blood samples from animals of the remaining aquarium were sequentially drawn at 30-min intervals. Radar charts were used to visualize the hourly change in the measured variables. Significant differences of each analysis between the measured variables by aquarium and the phases of the circadian cycle (light-dark) and morning-afternoon-night-dawn intervals, were evaluated using the Mann-Whitney and Kruskal-Wallis tests, respectively. A positive relationship between cortisol and glucose levels was found. Most analysis, except cholesterol and lactate did not show any significant difference between light and dark periods, and the intensity and frequency of peaks observed were not deleterious to individuals. (AU) | |
| FAPESP's process: | 14/17967-4 - Use of immunostimulants on Nile Tilapia |
| Grantee: | Maria José Tavares Ranzani de Paiva |
| Support Opportunities: | Regular Research Grants |