Bacterial microbiota of the Macrobrachium amazonicum from São Francisco river, Brazil

Abstract

The objective of the present study was to determine the bacterial microbiota of shrimp cinnamon, continental kind of frequent occurrence. The shrimps were collected on the banks of the Rio São Francisco in the city of Petrolina-PE and streaked in Tryptic Soy Agar (TSA) and MacConkey agar (MC) and incubated at 27ºC. The reading of the plates was performed in up to 48 hours, and bacterial agents were identified. Twenty six 26 isolates were found being: Enterobacter spp. (n=7), Klebsiella spp. (n=4), Staphylococcus spp. (n=4), Acinetobacter spp. (n=3), Streptococcus spp. (n=2), Alcaligenes spp. (n=2), Shigella spp. (n=1), Escherichia coli (n=1), Enterococcus spp. (n=1), and Pseudomonas spp. (n=1). Antimicrobial activity was determined by the disk diffusion Kirby-Bauer test. Of the isolates 92.3% were sensible to enrofloxacin , 88.4% to tetracycline, 84.6% to ceftriaxone , 84.6% to sulfazotrim, 76.9% to streptomycin, 65.3% to gentamicin, 57.6% to nalidixic acid, 57.6% to erythromycin, 53.8% to ampicillin, 50% to amoxacillin, 46.1% to nitrofurantoin, 42.3% to neomycin and 38.4% to lincomycin. The more sensible bacterial genus was Streptococcus spp. and Pseudomonas spp. the least sensitive. This study showed that bacteria with pathogenic potential for man in specie M. amazonicum. Keywords: Antibiotics, bacterials, shrimp.