This study investigated for the first time the effectiveness of therapeutic baths with essential oil (EO) of Piper hispidum against monogeneans Anacanthorus spathulatus, Notozothecium janauachensis, Mymarothecium boegeri and Linguadactyloides brinkmanni from the gills of Colossoma macropomum, as well as the hematological and histological effects on this fish. In therapeutic baths, 100 mg/L of P. hispidum essential oil and two control groups (water from the culture tank and water from the culture tank with 70% alcohol) were exposed for 1 h/day, with intervals of 48 hours for 3 days, and three replicates each were used. Therapeutic baths with 100 mg/L of P. hispidum essential oil had an efficacy of 78.6% against monogeneans. The toxicity of this essential oil was low, since there were a few physiological and histopathological changes that did not compromise the functioning of the gills of the fish. Therefore, 100 mg/L of P. hispidum essential oil was effective for controlling monogeneans in C. macropomum, when short therapeutic baths were used without compromising the health of the exposed fish.
Este estudo investigou pela primeira vez, a eficácia de banhos terapêuticos com óleo essencial (OE) de Piper hispidum contra monogenéticos Anacanthorus spathulatus, Notozothecium janauachensis, Mymarothecium boegeri e Linguadactyloides brinkmanni das brânquias de Colossoma macropomum, bem como os efeitos hematológicos e histológicos neste peixe. Foram usados 100 mg/L de óleo essencial de P. hispidum e dois grupos controles (água do tanque de cultivo e água do tanque de cultivo com álcool 70%) expostos durante 1 hora por dia, com intervalos de 48 horas durante 3 dias, três repetições cada. Banhos terapêuticos com 100 mg/L de OE de P. hispidum tiveram uma eficácia de 78,6% contra monogenéticos. A toxicidade foi baixa, pois ocorreram poucas alterações fisiológicas e histopatológicas que não comprometeram o funcionamento das brânquias dos peixes. Portanto, houve eficácia de 100 mg/L de OE de P. hispidum para controle de monogenéticos em C. macropomum, quando usados banhos terapêuticos curtos sem prejudicar a saúde dos peixes expostos.