Survival and behavioural responses of cool and warm water fish sedated with AQUI-S^® 20E (10% eugenol) at high loading densities

Abstract

This study evaluated the effects of AQUI-S â 20E (10% eugenol) sedation on the survival and behaviour of yellow perch Perca flavescens (Mitchill) and Nile tilapia Oreochromis niloticus L. held in high loading densities. Fish were held in 0-300 mg L À1 AQUI-S â 20E (0-30 mg L À1 eugenol) for up to 10 h in static tanks. At 17°C, yellow perch held in 200 and 300 mg L À1 AQUI-S â 20E were lightly sedated for up to 7 h. Yellow perch at 200 and 300 mg L À1 AQUI-S â 20E also had >95% mean survival 7-days post exposure using loading densities up to 360 g L À1 . Nile tilapia were only sedated for ≤3 h in concentrations up to 300 mg L À1 at 22°C and had >90% mean survival at loading densities ≤480 g L À1 . Ammonia in tanks increased significantly as loading density increased, but treatment with AQUI-S â 20E did not reduce ammonia accumulation. Results suggest that AQUI-S â 20E was effective to sedate yellow perch and Nile tilapia at high loading densities, but sedation varied with loading density and species.

Effect of density on survival, physiological parameters and water quality during pirarucu transportation in open system

“…Ammonia concentrations increased during transportation in all densities tested and it was higher in higher densities, as reported in the transportation of other fish species (Cupp et al., ; Gomes, Baldisserotto, & Senhorini, ; Manuel et al., ; Treasurer, ; Urbinati, Abreu, Camargo, Angel, & Parra, ). Such increase in ammonia concentration in transportation water may be the result of fish metabolism and it is a difficult factor to control during transportation, but it could be minimized with prior fasting of the individuals (Harmon, ; Sampaio, & Freire, ), which was done in the present study.…”

Potential implications of acoustic stimuli as a non‐physical barrier to silver carp and bighead carp

“…Previous studies suggest that 48 hr is more than enough time for fish to metabolise eugenol, as the compound was not detected in tissues and normal swimming behaviour resumed in <30 min in fish exposed to greater quantities for longer periods of time (Cupp et al. , in press; Hikasa, Takase, Ogasawara & Ogasawara, ; Meinertz, Schreier, Porcher, Smerud & Gaikowski, ). Two‐ or three‐day trials were conducted from July through August 2014.…”

Effect of density of fingerling and juvenile pirarucu during transportation on water quality and physiological parameters

“…To minimize the influence of handling stress on transportation, two days before the trials began, fish were captured and immobilized for biometric measurements (weight and total length) (Cupp et al 2017). Then they were distributed in the 300 L tanks in the densities informed above at a constant water flow (4.5 L min -1 ) until they were packed for shipping.…”