ABSTRACT. Minimization of stress during the transportation of live fish is essential in maintaining the welfare and performance of the animals. In order to test the hypothesis that stress during transport of fingerlings of Nile tilapia (Oreochromis niloticus) can be reduced with the aid of the anesthetics menthol, eugenol or benzocaine, we have assessed the effects of these agents at various concentrations on the physiological parameters and survival rates of fish subjected to conditions simulating those normally used in transportation. , maintained levels of plasma cortisol and glucose that were lower than those of the stressed but untreated controls and within the physiological limits of the baseline values for this species. Under these conditions, the survival rate was 100%, suggesting that stress was substantially reduced despite dense consignment. Treatments involving higher doses of the studied agents induced significant anesthetic toxicity. , mantiveram níveis de cortisol no plasma e de glucose que foram menores do que os dos controles não tratados e estressados, mas dentro dos limites fisiológicos dos valores da linha de base para esta espécie. Sob estas condições, a taxa de sobrevivência foi de 100%, o que sugere que o estresse foi substancialmente reduzido, apesar da remessa densa. Os tratamentos que envolvem doses mais elevadas dos agentes estudados induzindo uma toxicidade anestésica mais significativa.Palavras-chave: mentol, bezocaína, eugenol, peixe.
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