Adhesion to brown trout skin mucus, antagonism against cyst adhesion and pathogenicity to rainbow trout of some inhibitory bacteria against Saprolegnia parasitica

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Adhesion to brown trout skin mucus, antagonism against cyst adhesion and pathogenicity to rainbow trout of some inhibitory bacteria against Saprolegnia parasitica

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Title: Adhesion to brown trout skin mucus, antagonism against cyst adhesion and pathogenicity to rainbow trout of some inhibitory bacteria against Saprolegnia parasitica
Author: Carbajal González, María Teresa;Fregeneda Grandes, Juan Miguel;González Palacios, Concepción;Aller Gancedo, José Miguel
xmlui.dri2xhtml.METS-1.0.item-contributor: Facultad de Veterinaria
xmlui.dri2xhtml.METS-1.0.item-area: Sanidad Animal
Abstract: Biological control of saprolegniosis with bacteria might be an alternative to the use of chemical compounds. Among criteria for the selection of such bacteria are their absence of pathogenicity to fish and their ability to prevent adhesion of the pathogen to the skin mucus. The pathogenicity to rainbow trout of 21 bacterial isolates with in vitro inhibitory activity against Saprolegnia parasitica was studied. Fifteen of the isolates, identified as Aeromonas sobria, Pantoea agglomerans, Pseudomonas fluorescens, Serratia fonticola, Xanthomonas retroflexus and Yersinia kristensenii, were non-pathogenic when injected into rainbow trout. Their capacity to adhere to the skin mucus of male and female brown trout and to reduce the adhesion of S. parasitica cysts under exclusion, competition and displacement conditions was tested. The 15 bacterial isolates showed a low adhesion rate, ranging between 1.7% (for an A. sobria isolate) and 15.3% (a P. fluorescens isolate). This adhesion was greater in the case of mucus from male brown trout than from females. Similarities in the adhesion to male mucus and other substrates and correlation to that observed to polystyrene suggest that adhesion to skin mucus does not depend on the substrate. A high percentage (88.9%) of the S. parasitica cysts adhered to the skin mucus of male brown trout. Almost all of the bacteria reduced this adhesion ratio significantly under exclusion and competition conditions. However, only half of the isolates displaced cysts from skin mucus, and more bacterial cells were necessary for this effect. A novel method to study the adhesion of S. parasitica cysts to skin mucus of trout and their interactions with inhibitory bacteria is described.
xmlui.dri2xhtml.METS-1.0.item-desfisica: P. 35-44
xmlui.dri2xhtml.METS-1.0.item-peerreviewed: SI
Publisher: Inter-Research
xmlui.dri2xhtml.METS-1.0.item-citation: Diseases of aquatic organisms, 2013, vol. 104, n. 1
URI: http://hdl.handle.net/10612/9280
Date: 2013-04-29
xmlui.dri2xhtml.METS-1.0.item-tipo: info:eu-repo/semantics/article
Subject: Sanidad animal
Veterinaria
Zoología
xmlui.dri2xhtml.METS-1.0.item-palclave: Truchas
Saprolegnia parasítica
Flora cutánea
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