Author(s): Biller, Jaqueline Dalbello [UNESP] ; Takahashi, Leonardo Susumu [UNESP] ; Urbinati, Elisabeth Criscuolo [UNESP]
Date: 2020
Persistent ID: http://hdl.handle.net/11449/200277
Origin: Oasisbr
Subject(s): Acute stress; Chronic stress; Cortisol; Glycogen; Sequential stressors; Acute stress; Acute stress; Chronic stress; Chronic stress; Cortisol; Cortisol; Glycogen; Glycogen; Sequential stressors; Sequential stressors
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fish metabolic allostatic dynamics, when animal present physiological modifications that can be strategies to survive, are important for promoting changes to ensure whole body self-protection and survival in chronic states of stress. To determine the impact of sequential stressors on pacu (Piaractus mesopotamicus), fish were subjected to two trials of stressful treatments, administration of exogenous dietary cortisol, and parasite challenge. The first experiment consisted of a two-day acute stress trial and the second, an eight-day chronic stress trial, and after both experiments, fish parasite susceptibility was assessed with the ectoparasite Dolops carvalhoi challenge. Physiological changes in response to acute trial were observed in glycogen, cortisol, glucose, osmolarity, sodium, calcium, chloride, potassium, hematocrit, hemoglobin, red blood cells and mean corpuscular volume, and white blood cell (P < 0.05), whereas response to chronic trial were observed in glycogen, osmolarity, potassium, calcium, chloride, mean corpuscular volume, white blood cell, neutrophil, and lymphocyte (P < 0.05). Acute trials caused physiological changes, however those changes did not induce the consumption of hepatic glycogen. Chronic stress caused physiological changes that induced hepatic glycogen consumption. Under acute trial, stress experience was important to fish to achieve homeostasis after chronic stress. Changes were important to modulate the response to stressor, improve body health status, and overcome the extra stressor with D. carvalhoi challenge. The experiments demonstrate that pacu initiate strategic self-protective metabolic dynamics in acute states of stress that ensure the maintenance of important life processes in front of sequential stressors.
College of Agricultural and Technological Sciences São Paulo State University (UNESP), Rod. Cmte João Ribeiro de Barros, Km 651
Aquaculture Center of UNESP São Paulo State University (UNESP), Via de Acesso Prof. Paulo Donato Castellane s/n
College of Agricultural and Technological Sciences São Paulo State University (UNESP), Rod. Cmte João Ribeiro de Barros, Km 651
Aquaculture Center of UNESP São Paulo State University (UNESP), Via de Acesso Prof. Paulo Donato Castellane s/n
