Stress responses in juvenile pacu (Piaractus mesopotamicus) submitted to repeated air exposure.
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2008-01-01
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Biller, Jaqueline Dalbello
Bendhack, Fabiano
Takahashi, Leonardo Susumu
Urbinati, Elisabeth Criscuolo [UNESP]
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Pacu juveniles (5.2 [plus or minus] 1.5 g) were submitted to two one-minute air exposures in a 24h interval, and sampled before the exposure (control) and 5, 15, 30 and 60 min., 24 and 48h afterwards for whole-body cortisol, sodium, potassium and calcium ion concentrations. For the first air exposure, there was a trend of increased cortisol concentration after 15 min., whereas in the second air exposure, the cortisol concentration increased significantly within 5 min. after stress was induced. Sodium ion concentration increased significantly 24h after both air exposures. Potassium concentration presented fluctuations over the experimental period. Calcium ion concentration increased progressively from 5 to 30 min., in both air exposures. The repeated air exposures exacerbated the cortisol response, but they did not affect the recovery ability of pacu over the experimental period. Additionally, the whole-body cortisol measurement might be a reliable indicator of stress, when sampled fish are smaller and blood volumes are very low, making samples inadequate for analysis.
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Acta Scientiarum Animal Sciences. , v. 30, n. 1, p. 89-93, 2008.