Cellular viability and growth of microalgae: effect of the culture medium

Abstract

In Aquaculture, the use of microalgae is fundamental in the first feeding of native fish species, since their optimal nutritional level favors survival. Successful production of microalgae under laboratory conditions depends on the culture medium used during the cryopreservation stage of production. Agricultural fertilizers can be used as a low-cost alternativeculture media that promotes cell growth and cryopreservation. The objective was to evaluate the effect of two culture media on population growth (PG) and post-thawing viability (PTV) of three microalgal species (Chlorellasp., Desmodesmussp., and Ankistrodesmussp.). The PG and PTV were evaluated for F/2 Guillard and Nutrifoliar® culture media. Instantaneous growth rate (K), doubling time (dt), yield (y), and maximum density (md) were evaluated for PG in both culture media. For VCP, 5 and 10 % methanol wasusedin six treatments. The PTV was classified as no cell damage (NCD), cell damage (CD), and marked lesions (ML). Population growth did not differ among microalgae (p >0.05). T1 resulted in the lowest dt for Desmodesmussp., (p 0,05). El T1 tuvo el menor td para Desmodesmussp (p<0,05). El T2 presentó el mayor r y dm para las tres microalgas (p<0,05).En la viabilidad celular post-descongelación, el mayor porcentaje SDC para Chlorellasp., al día (d) cero, fue similar en T3 y T4 y al d cinco fue en T6; para Desmodesmussp, al d cero fue en T6 y al d cinco fue similar en T6 y T1; mientras que, para Ankistrodesmussp, al d cero y cinco se presentó en T3. Se concluye que el medio de cultivo Nutrifoliar®, es una alternativa viable y de bajo costo para el cultivo y la criopreservación de microalgas de agua dulc

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