No abstract

No abstract

No abstract

Aquaponics is emerging as an alternative for high-health food production. Being able to identify the technical viability of non-conventional plants and fish species would help to increase the interest and possibilities in aquaponic systems. The goal of the present study was to evaluate the aquaponics production of two garnish species: scallion (S) and parsley (P), using effluents of pacu and red tilapia culture. Two aquaponics devices were used, differing according to the fish species, generating two different effluents. Thus, for plant performance, four treatments were evaluated in a factorial design (plant species and fish effluent as main factors), as followed: Pacu-S, Tilapia-S, Pacu-P, and Tilapia-P, with three replicates each, for 35 days. Fish performance was evaluated using Student's t test. Each experimental device included a fish tank, filters, and six experimental units for the plants (floating rafts). Results

-The objective of this work was to evaluate the efficacy of eugenol as an anesthetic for juvenile common snook, and to determine the minimum effective concentration for use in handling procedures. In the first trial, juvenile common snook were subjected to immersion baths at 25, 50, 75, 100, 125, and 150 mg L -1 eugenol concentrations, after which induction and recovery times were evaluated. In the second experiment, the lethal exposure time (LT 50 ) at 75 mg L -1 was estimated. Minimum effective eugenol concentration was 50 mg L -1 , and the stage of deep anesthesia and recovery were, respectively, reached at 126.3 and 208.8 s. At 75 mg L -1 , LT 50 was 1,314 s, and induction time and recovery were also satisfactory; however, fish cannot tolerate over 229 s exposure.Index terms: Centropomus undecimalis, anesthesia, fish farming, fish handling. Eugenol como anestésico para juvenis de robalo-flechaResumo -O objetivo deste trabalho foi avaliar a eficácia do eugenol como anestésico para juvenis de robalo-flecha e determinar a concentração mínima eficaz que pode ser utilizada em procedimentos de manejo. Termos para indexação: Centropomus undecimalis, anestesia, piscicultura, manejo de peixes.