AUTOCHTHONOUS YEASTS AS GROWTH FACTOR IN Rhamdia quelen: FIRST APPROACHES

GUIDOLI MG; MENDOZA JA; CACERES AC; BOEHRINGER SI

revista veterinaria

Universidad Nacional del Nordeste

Lugar: Corrientes; Año: 2017 vol. 28 p. 37 - 40

Rhamdia quelen is an autochthonous fish used for aquaculture in the Northeast of Argentina. Antibiotics as growing factors in fish production had been criticized in the last years and the use of microorganisms emerged as a putative replacement. The aim of this study was to isolate autochthonous yeasts from R. quelen and to evaluate the effect of the administration over biometrical parameters of larvae under intensive culture system. Fungi were isolatedfrom the digestive tract of wild specimens, phenotypically identified and evaluated on their ability to exert beneficial properties. One selected fungal isolate was administered, four times a day, dead or alive at 1 or 2% together with balanced feed to R. quelen larvae for 15 days. After treatment larvae were counted and weighted in order to obtain the values of survival, meanweight and total biomass. Only four Candida tropicalis isolates were obtained. None of them expressed beneficial properties. One fungal isolate was randomly selected for in vivo assays. Results indicated that only dead yeast at 1% induced a significant increment of biomass when compared with the control group (p