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This study evaluated extracts of Condalia buxifolia as anesthetics for the silver catfish Rhamdia quelen. The effectivenessof eugenol and of the methanolic extract (ME) of C. buxifolia during the transport of this species was also assessed. Fish oftwo different weights (1.50±0.02 g and 165.70±22.50 g) were transferred to aquaria containing water with the C. buxifolia MEor with fractions obtained from the ME, such as the n-hexane, dichloromethane, ethyl acetate, n-butane and aqueous fractions,at concentrations from 0-300 μL L-1. The C. buxifolia ME in the 0.5-120 μL L-1 range caused only light sedation, and thefractions did not have an effect on the fish. In the second experiment, another group of fish was transported for 12 h in 15plastic bags. The fish were divided into five groups: control, 1 or 2.5 μL L-1 eugenol and 25 or 50 μL L-1 C. buxifolia ME. Thenon-ionized ammonia levels were lower at the end of transport in the groups with the compounds than in that with water alone.Moreover, both compounds decreased the Na+, Cl-, and K+ net effluxes; therefore, their addition to the water during transportis advisable because they reduce fish mortality and ion loss.Este estudo investigou extratos de Condalia buxifolia como anestésico para jundiá Rhamdia quelen, e também a eficiênciado eugenol e do extrato metanólico (EM) de C. buxifolia para utilização durante o transporte dessa espécie. Peixes de doisdiferentes pesos (1,50±0,02 g e 165,70±22,50 g) foram transferidos para aquários contendo água com o EM de C. buxifolia oufrações obtidas a partir do EM (n-hexano, acetato de diclorometano, etil n- butano e aquoso, em concentrações na faixa de 0- 300 μL L-1. O EM de C. buxifolia em concentrações na faixa de 0,5 - 120 μL L-1 causou somente uma sedação leve e as fraçõesnão tiveram efeito. No segundo experimento outro grupo de peixes foi transportado por 12 h em 15 sacos plásticos divididosem cinco tratamentos: controle, 1 ou 2,5 μL L-1 de eugenol e 25 ou 50 μL L-1 de EM de C. buxifolia. Os níveis de amônia nãoionizadaforam menores nos tratamentos com ambos compostos em relação à água (controle). Além disso, ambos compostosdiminuíram os efluxos líquidos de Na+, Cl- e K+ e, portanto, sua adição na água de transporte é aconselhável, pois reduzem amortalidade e a perda de íons dos peixes

Efficacy of eugenol and the methanolic extract of Condalia buxifolia during the transport of the silver catfish Rhamdia quelen