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The physiological stress responses of tambaqui and hybrid tambatinga were evaluated after subjecting the fish to routine practices in a breeding system such as periodic biometric procedures. For 270 days of culture, the fish underwent monthly biometric measurements, and at the end of the period, blood was collected at six sampling times (before, immediately after and 2, 24, 48 and 72 h after biometric measurements) for the evaluation of physiological indicators of stress. Tambatinga are more susceptible to stress because they presented higher levels of cortisol and glucose in the bloodstream after handling and took longer to recover their basal physiological state for these parameters. However, the low cortisol levels observed in both species suggest that the fish were familiar with biometric procedures, resulting in a less intense response. Handling led to an increase in the cellular volume of erythrocytes in tambaqui, resulting in a change in hematocrit and a decrease in hemoglobin concentration. Hypochloremia was found in both species only 72 h after handling. Biometric procedures promote hormonal, hematological and hydroelectrolytic changes in the tambaqui and hybrid tambatinga, but when routinely adopted, at regular intervals, they elicit stress responses of lower magnitude.

Exposição rotineira aos procedimentos biométricos na piscicultura revela diferenças na resposta ao estresse em tambaqui e hí­­brido tambatinga

Exposição rotineira aos procedimentos biométricos na piscicultura revela diferenças na resposta ao estresse em tambaqui e híbrido tambatinga