AUTOCHTHONOUS YEASTS AS GROWTH FACTOR IN Rhamdia quelen: FIRST APPROACHES

GUIDOLI, MARCOS G.; MENDOZA, JORGE A.; CÁCERES, ANTONIO C.; BOEHRINGER, SILVIA I.; SÁNCHEZ, SEBASTIÁN

Revista Veterinaria

Universidad Nacional del Nordeste

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 work was to isolate autochthonous yeasts from R. quelen and evaluate the effect of its administration over biometrical parameters of larvae under intensive culture system. Fungi were isolated from the digestive tract of wild specimens, phenotypically identified and evaluated on their ability to exert beneficial properties. One selected isolate was administered, four times a day, dead or alive at 1 or 2% together with balance feed to R. quelen larvae for 15 days. After treatment larvae were counted and weighted in order to obtain the values of survival, mean weight and total biomass. Only four Candida tropicalis isolates were obtained. None of them express beneficial properties. One isolate was randomly selected for in vivo assays. Results indicate that only dead yeast at 1% induces a significant increment of biomass when compared with control group (p>0.05). Survival rate is boosted significantly (p>0.05) with dead yeast and with no significance (p