Evaluación de la actividad depresora del mentol en trucha arco iris (Oncorhynchus mykiss) en diferentes condiciones de pH

URZUA, NATALIA; LUDERS, CARLOS; PRIETO, GUILLERMO; MANCINI, MIGUEL; ERRECALDE, CARLOS

Revista de Investigaciones Veterinarias del Perú

Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos

Año: 2021 vol. 32 p. 1 - 7

1609-9117

The action of menthol on physiological and anesthesiological variables in rainbowtrout was evaluated. Clinically healthy juvenile trout were used, of both sexes, formed ingroup A (n=20) of 201.4 ± 60.1 g of weight subjected to 100 ppm/L of menthol in water atpH 6.4 and in group B (n=20) of 187.3 ± 48.6 g of weight exposed to identical concentrationof menthol with the water adjusted to pH 8.0 with sodium bicarbonate. The fish wereplaced in containers with water at 16.7 °C and electrical conductivity of 0.10 mScm -1. Thework methodology was: 1) acclimatization of fish in a container without drug and recordingof the basal respiratory rate (RR) after adopting a normal swimming behavior; 2) transferto a second container with menthol and recording of times of loss of lateral balance andanesthesia; 3) transfer of anesthetized fish to a third container without drug and record ofRR and its behavior during the recovery period. In group A, anesthesia was achieved in127.7 ± 46.3 s with a strong reduction in baseline RR from 132.4 ± 12.6 to 40.4 ± 14.4 mov/minand total recovery occurred in 189.7 ± 64.2 s. In group B, anesthesia and recovery timewere observed at 93.4 ± 34.3 and 181.7 ± 68.0 s, respectively, and a reduction in RR from137 ± 14.3 to 43.6 ± 10.4 mov/min. The results indicate that menthol in water adjusted topH 8.0 is a good alternative for rainbow trout fish farming practices