Sensibilidade in vitro à enrofloxacina e oxitetracicllna de vibrio isolados na larvicultura de camarão marinho (Litopenaeus vannamei)

ln Brazil, the cultivation of sea shrimp presented a more competitive pattern alter 1996, with high annual grow1h and high productivity. Following this increase, the Brazilian larvicultures had a good performance; in spite of practically ali had already presented epizooties of high pathogenicity, mainly the ones of bacterial origino As a result of this situation, the indiscriminate use of antibiotics became popular in several areas of the world, with serious and negatives consequences, which could be environmental, economical, legal and mainly of public health, because of the generation of resistant bacterial strains to these drugs. ln this work, the isolation and identification of species of Vibrio in two commercial larvicultures of sea shrimp was aimed and also determine the respective Minimal Inhibitory Concentrations (MIC) for oxitetraciciin and enrofloxacin. The identified bacteria were: Aeromonas hydrophila, enterobacteriaceas, Pseudomonas aeruginosa, Vibrio alginolyticus, Vibrio anguillarum, Vibrio fumissii, Vibrio fluvialis, Vibrio harveyi, Vibrio parahaemolyliclls, Vibrio spp. and Vibrio vulnificus. These strains presented different profiles of resistance or sensibility to oxitetraciclin and sensibility to enrofloxacin in concentrations from 5 to 50 ppm. Oxitetraciclin was not considered the best election drug tei the vibrionaceae control in sea shrimp larvicultures, while enrofloxacin completely inhibited the bacterial development when used in a minimal concentration of 5 ppm.